greybus-dev

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560 discussions

Re: Bug report: greybus/interface.c: use-after-free bug in gb_interface_release due to race condition

by Greg KH

On Tue, Apr 16, 2024 at 11:00:25AM +0800, sicong wrote: > greybus/interface.c: use-after-free bug in gb_interface_release due to > race condition. > > In gb_interface_create, &intf->mode_switch_completion is bound with > gb_interface_mode_switch_work. Then it will be started by > gb_interface_request_mode_switch. Here is the code. > if (!queue_work(system_long_wq, &intf->mode_switch_work)) { > ... > } > > If we call gb_interface_release to make cleanup, there may be an > unfinished work. This function will call kfree to free the object > "intf". However, if gb_interface_mode_switch_work is scheduled to > run after kfree, it may cause use-after-free error as > gb_interface_mode_switch_work will use the object "intf". > The possible execution flow that may lead to the issue is as follows: > > CPU0 CPU1 > > | gb_interface_create > | gb_interface_request_mode_switch > gb_interface_release | > kfree(intf) (free) | > | gb_interface_mode_switch_work > | mutex_lock(&intf->mutex) (use) > > This bug may be fixed by adding the following code before kfree. > cancel_work_sync(&intf->mode_switch_work); Wonderful, please submit a patch with this information and we will be glad to review it. thanks, greg k-h

1 year

[PATCH v3 0/8] misc: Add mikroBUS driver

by Ayush Singh

MikroBUS is an open standard developed by MikroElektronika for connecting add-on boards to microcontrollers or microprocessors. It essentially allows you to easily expand the functionality of your main boards using these add-on boards. This patchset adds mikroBUS as a Linux bus type and provides a driver to parse, and flash mikroBUS manifest and register the mikroBUS board. The v1 and v2 of this patchset was submitted by Vaishnav M A back in 2020. This patchset also includes changes made over the years as part of BeagleBoards kernel. Link: https://www.mikroe.com/mikrobus Link: https://docs.beagleboard.org/latest/boards/beagleplay/ Link: https://lore.kernel.org/lkml/20200818124815.11029-1-vaishnav@beagleboard.or… Patch v2 Changes in v3: - Use phandle instead of busname for spi - Use spi board info for registering new device - Convert dt bindings to yaml - Add support for clickID - Code cleanup and style changes - Additions required to spi, serdev, w1 and regulator subsystems Changes in v2: - support for adding mikroBUS ports from DT overlays, - remove debug sysFS interface for adding mikrobus ports, - consider extended pin usage/deviations from mikrobus standard specifications - use greybus CPort protocol enum instead of new protocol enums - Fix cases of wrong indentation, ignoring return values, freeing allocated resources in case of errors and other style suggestions in v1 review. Ayush Singh (7): dt-bindings: misc: Add mikrobus-connector w1: Add w1_find_master_device spi: Make of_find_spi_controller_by_node() available regulator: fixed-helper: export regulator_register_always_on greybus: Add mikroBUS manifest types mikrobus: Add mikrobus driver dts: ti: k3-am625-beagleplay: Add mikroBUS Vaishnav M A (1): serdev: add of_ helper to get serdev controller .../bindings/misc/mikrobus-connector.yaml | 110 ++ MAINTAINERS | 7 + .../arm64/boot/dts/ti/k3-am625-beagleplay.dts | 76 +- drivers/misc/Kconfig | 1 + drivers/misc/Makefile | 1 + drivers/misc/mikrobus/Kconfig | 19 + drivers/misc/mikrobus/Makefile | 6 + drivers/misc/mikrobus/mikrobus_core.c | 942 ++++++++++++++++++ drivers/misc/mikrobus/mikrobus_core.h | 201 ++++ drivers/misc/mikrobus/mikrobus_id.c | 229 +++++ drivers/misc/mikrobus/mikrobus_manifest.c | 502 ++++++++++ drivers/misc/mikrobus/mikrobus_manifest.h | 20 + drivers/regulator/fixed-helper.c | 1 + drivers/spi/spi.c | 206 ++-- drivers/tty/serdev/core.c | 19 + drivers/w1/w1.c | 6 +- drivers/w1/w1_int.c | 27 + include/linux/greybus/greybus_manifest.h | 49 + include/linux/serdev.h | 4 + include/linux/spi/spi.h | 4 + include/linux/w1.h | 1 + 21 files changed, 2318 insertions(+), 113 deletions(-) create mode 100644 Documentation/devicetree/bindings/misc/mikrobus-connector.yaml create mode 100644 drivers/misc/mikrobus/Kconfig create mode 100644 drivers/misc/mikrobus/Makefile create mode 100644 drivers/misc/mikrobus/mikrobus_core.c create mode 100644 drivers/misc/mikrobus/mikrobus_core.h create mode 100644 drivers/misc/mikrobus/mikrobus_id.c create mode 100644 drivers/misc/mikrobus/mikrobus_manifest.c create mode 100644 drivers/misc/mikrobus/mikrobus_manifest.h base-commit: 61996c073c9b070922ad3a36c981ca6ddbea19a5 -- 2.44.0

1 year

[PATCH 00/11] address remaining stringop-truncation warnings

by Arnd Bergmann

From: Arnd Bergmann <arnd(a)arndb.de> We are close to being able to turn on -Wstringop-truncation unconditionally instead of only at the 'make W=1' level, these ten warnings are all that I saw in randconfig testing across compiler versions on arm, arm64 and x86. The final patch is only there for reference at the moment, I hope we can merge the other ones through the subsystem trees first, as there are no dependencies between them. Arnd Arnd Bergmann (11): staging: vc04_services: changen strncpy() to strscpy_pad() scsi: devinfo: rework scsi_strcpy_devinfo() staging: replace weird strncpy() with memcpy() orangefs: convert strncpy() to strscpy() test_hexdump: avoid string truncation warning acpi: avoid warning for truncated string copy block/partitions/ldm: convert strncpy() to strscpy() blktrace: convert strncpy() to strscpy_pad() staging: rtl8723bs: convert strncpy to strscpy staging: greybus: change strncpy() to strscpy() kbuild: enable -Wstringop-truncation globally block/partitions/ldm.c | 6 ++-- drivers/acpi/acpica/tbfind.c | 19 +++++------ drivers/scsi/scsi_devinfo.c | 30 +++++++++++------ drivers/staging/greybus/fw-management.c | 4 +-- .../staging/rtl8723bs/os_dep/ioctl_cfg80211.c | 5 ++- drivers/staging/rts5208/rtsx_scsi.c | 2 +- .../vc04_services/vchiq-mmal/mmal-vchiq.c | 4 +-- fs/orangefs/dcache.c | 4 +-- fs/orangefs/namei.c | 33 +++++++++---------- fs/orangefs/super.c | 16 ++++----- kernel/trace/blktrace.c | 3 +- lib/test_hexdump.c | 2 +- scripts/Makefile.extrawarn | 1 - 13 files changed, 64 insertions(+), 65 deletions(-) -- 2.39.2 Cc: "Richard Russon Cc: Jens Axboe <axboe(a)kernel.dk> Cc: Robert Moore <robert.moore(a)intel.com> Cc: "Rafael J. Wysocki" <rafael.j.wysocki(a)intel.com> Cc: Len Brown <lenb(a)kernel.org> Cc: "James E.J. Bottomley" <jejb(a)linux.ibm.com> Cc: "Martin K. Petersen" <martin.petersen(a)oracle.com> Cc: Viresh Kumar <vireshk(a)kernel.org> Cc: Johan Hovold <johan(a)kernel.org> Cc: Alex Elder <elder(a)kernel.org> Cc: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Cc: Florian Fainelli <florian.fainelli(a)broadcom.com> Cc: Broadcom internal kernel review list <bcm-kernel-feedback-list(a)broadcom.com> Cc: Mike Marshall <hubcap(a)omnibond.com> Cc: Martin Brandenburg <martin(a)omnibond.com> Cc: Steven Rostedt <rostedt(a)goodmis.org> Cc: Masami Hiramatsu <mhiramat(a)kernel.org> Cc: Mathieu Desnoyers <mathieu.desnoyers(a)efficios.com> Cc: Andrew Morton <akpm(a)linux-foundation.org> Cc: Masahiro Yamada <masahiroy(a)kernel.org> Cc: Nathan Chancellor <nathan(a)kernel.org> Cc: Nicolas Schier <nicolas(a)fjasle.eu> Cc: Arnd Bergmann <arnd(a)arndb.de> Cc: Kees Cook <keescook(a)chromium.org> Cc: Alexey Starikovskiy <astarikovskiy(a)suse.de> Cc: linux-ntfs-dev(a)lists.sourceforge.net Cc: linux-block(a)vger.kernel.org Cc: linux-kernel(a)vger.kernel.org Cc: linux-acpi(a)vger.kernel.org Cc: acpica-devel(a)lists.linux.dev Cc: linux-scsi(a)vger.kernel.org Cc: greybus-dev(a)lists.linaro.org Cc: linux-staging(a)lists.linux.dev Cc: linux-rpi-kernel(a)lists.infradead.org Cc: linux-arm-kernel(a)lists.infradead.org Cc: devel(a)lists.orangefs.org Cc: linux-trace-kernel(a)vger.kernel.org Cc: linux-kbuild(a)vger.kernel.org

1 year

[PATCH 3/3] [v2] staging: greybus: change strncpy() to strscpy_pad()

by Arnd Bergmann

From: Arnd Bergmann <arnd(a)arndb.de> gcc-10 warns about a strncpy() that does not enforce zero-termination: In file included from include/linux/string.h:369, from drivers/staging/greybus/fw-management.c:9: In function 'strncpy', inlined from 'fw_mgmt_backend_fw_update_operation' at drivers/staging/greybus/fw-management.c:306:2: include/linux/fortify-string.h:108:30: error: '__builtin_strncpy' specified bound 10 equals destination size [-Werror=stringop-truncation] 108 | #define __underlying_strncpy __builtin_strncpy | ^ include/linux/fortify-string.h:187:9: note: in expansion of macro '__underlying_strncpy' 187 | return __underlying_strncpy(p, q, size); | ^~~~~~~~~~~~~~~~~~~~ For some reason, I cannot reproduce this with gcc-9 or gcc-11, and I only get a warning for one of the four related strncpy()s, so I'm not sure what's going on. Change all four to strscpy_pad(), which is the safest replacement here, as it avoids ending up with uninitialized stack data in the tag name. Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> --- v2 - use strscpy_pad() - use two-argument form - change all four instances, not just the one that produced the warning --- drivers/staging/greybus/fw-management.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) diff --git a/drivers/staging/greybus/fw-management.c b/drivers/staging/greybus/fw-management.c index 3054f084d777..a47385175582 100644 --- a/drivers/staging/greybus/fw-management.c +++ b/drivers/staging/greybus/fw-management.c @@ -123,8 +123,7 @@ static int fw_mgmt_interface_fw_version_operation(struct fw_mgmt *fw_mgmt, fw_info->major = le16_to_cpu(response.major); fw_info->minor = le16_to_cpu(response.minor); - strncpy(fw_info->firmware_tag, response.firmware_tag, - GB_FIRMWARE_TAG_MAX_SIZE); + strscpy_pad(fw_info->firmware_tag, response.firmware_tag); /* * The firmware-tag should be NULL terminated, otherwise throw error but @@ -153,7 +152,7 @@ static int fw_mgmt_load_and_validate_operation(struct fw_mgmt *fw_mgmt, } request.load_method = load_method; - strncpy(request.firmware_tag, tag, GB_FIRMWARE_TAG_MAX_SIZE); + strscpy_pad(request.firmware_tag, tag); /* * The firmware-tag should be NULL terminated, otherwise throw error and @@ -249,8 +248,7 @@ static int fw_mgmt_backend_fw_version_operation(struct fw_mgmt *fw_mgmt, struct gb_fw_mgmt_backend_fw_version_response response; int ret; - strncpy(request.firmware_tag, fw_info->firmware_tag, - GB_FIRMWARE_TAG_MAX_SIZE); + strscpy_pad(request.firmware_tag, fw_info->firmware_tag); /* * The firmware-tag should be NULL terminated, otherwise throw error and @@ -303,13 +301,13 @@ static int fw_mgmt_backend_fw_update_operation(struct fw_mgmt *fw_mgmt, struct gb_fw_mgmt_backend_fw_update_request request; int ret; - strncpy(request.firmware_tag, tag, GB_FIRMWARE_TAG_MAX_SIZE); + ret = strscpy_pad(request.firmware_tag, tag); /* * The firmware-tag should be NULL terminated, otherwise throw error and * fail. */ - if (request.firmware_tag[GB_FIRMWARE_TAG_MAX_SIZE - 1] != '\0') { + if (ret == -E2BIG) { dev_err(fw_mgmt->parent, "backend-update: firmware-tag is not NULL terminated\n"); return -EINVAL; } -- 2.39.2

1 year

[PATCH] staging: greybus: Clear up precedence for gcam logging macros

by Jackson Chui

Reported by checkpatch: CHECK: Macro argument 'gcam' may be better as '(gcam)' to avoid precedence issues Disambiguates '&' (address-of) operator and '->' operator precedence, accounting for how '(gcam)->bundle->dev' is a 'struct device' and not a 'struct device*', which is required by the dev_{dbg,info,err} driver model diagnostic macros. Issue found by checkpatch. Signed-off-by: Jackson Chui <jacksonchui.qwerty(a)gmail.com> --- drivers/staging/greybus/camera.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/staging/greybus/camera.c b/drivers/staging/greybus/camera.c index a8173aa3a995..d82a2d2abdca 100644 --- a/drivers/staging/greybus/camera.c +++ b/drivers/staging/greybus/camera.c @@ -180,9 +180,9 @@ static const struct gb_camera_fmt_info *gb_camera_get_format_info(u16 gb_fmt) #define GB_CAMERA_MAX_SETTINGS_SIZE 8192 -#define gcam_dbg(gcam, format...) dev_dbg(&gcam->bundle->dev, format) -#define gcam_info(gcam, format...) dev_info(&gcam->bundle->dev, format) -#define gcam_err(gcam, format...) dev_err(&gcam->bundle->dev, format) +#define gcam_dbg(gcam, format...) dev_dbg(&((gcam)->bundle->dev), format) +#define gcam_info(gcam, format...) dev_info(&((gcam)->bundle->dev), format) +#define gcam_err(gcam, format...) dev_err(&((gcam)->bundle->dev), format) static int gb_camera_operation_sync_flags(struct gb_connection *connection, int type, unsigned int flags, -- 2.34.1

1 year

[PATCH v2] greybus: lights: check return of get_channel_from_mode

by Rui Miguel Silva

If channel for the given node is not found we return null from get_channel_from_mode. Make sure we validate the return pointer before using it in two of the missing places. This was originally reported in [0]: Found by Linux Verification Center (linuxtesting.org) with SVACE. [0] https://lore.kernel.org/all/20240301190425.120605-1-m.lobanov@rosalinux.ru Fixes: 2870b52bae4c ("greybus: lights: add lights implementation") Reported-by: Mikhail Lobanov <m.lobanov(a)rosalinux.ru> Suggested-by: Mikhail Lobanov <m.lobanov(a)rosalinux.ru> Suggested-by: Alex Elder <elder(a)ieee.org> Signed-off-by: Rui Miguel Silva <rmfrfs(a)gmail.com> --- v1[1] -> v2: GregKh: - remove overkill WARN_ON and replace it for a dev_err [1]: https://lore.kernel.org/all/20240307094838.688281-1-rmfrfs@gmail.com/ drivers/staging/greybus/light.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/staging/greybus/light.c b/drivers/staging/greybus/light.c index c6bd86a5335a..9999f8401699 100644 --- a/drivers/staging/greybus/light.c +++ b/drivers/staging/greybus/light.c @@ -147,6 +147,9 @@ static int __gb_lights_flash_brightness_set(struct gb_channel *channel) channel = get_channel_from_mode(channel->light, GB_CHANNEL_MODE_TORCH); + if (!channel) + return -EINVAL; + /* For not flash we need to convert brightness to intensity */ intensity = channel->intensity_uA.min + (channel->intensity_uA.step * channel->led->brightness); @@ -549,7 +552,10 @@ static int gb_lights_light_v4l2_register(struct gb_light *light) } channel_flash = get_channel_from_mode(light, GB_CHANNEL_MODE_FLASH); - WARN_ON(!channel_flash); + if (!channel_flash) { + dev_err(dev, "failed to get flash channel from mode\n"); + return -EINVAL; + } fled = &channel_flash->fled; -- 2.44.0

1 year

[PATCH] greybus: lights: check return of get_channel_from_mode

by Rui Miguel Silva

If channel for the given node is not found we return null from get_channel_from_mode. Make sure we validate the return pointer before using it in two of the missing places. This was originally reported in [0]: Found by Linux Verification Center (linuxtesting.org) with SVACE. [0] https://lore.kernel.org/all/20240301190425.120605-1-m.lobanov@rosalinux.ru Fixes: 2870b52bae4c ("greybus: lights: add lights implementation") Reported-by: Mikhail Lobanov <m.lobanov(a)rosalinux.ru> Suggested-by: Mikhail Lobanov <m.lobanov(a)rosalinux.ru> Suggested-by: Alex Elder <elder(a)ieee.org> Signed-off-by: Rui Miguel Silva <rmfrfs(a)gmail.com> --- drivers/staging/greybus/light.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/staging/greybus/light.c b/drivers/staging/greybus/light.c index c6bd86a5335a..6f10b9e2c053 100644 --- a/drivers/staging/greybus/light.c +++ b/drivers/staging/greybus/light.c @@ -147,6 +147,9 @@ static int __gb_lights_flash_brightness_set(struct gb_channel *channel) channel = get_channel_from_mode(channel->light, GB_CHANNEL_MODE_TORCH); + if (!channel) + return -EINVAL; + /* For not flash we need to convert brightness to intensity */ intensity = channel->intensity_uA.min + (channel->intensity_uA.step * channel->led->brightness); @@ -549,7 +552,8 @@ static int gb_lights_light_v4l2_register(struct gb_light *light) } channel_flash = get_channel_from_mode(light, GB_CHANNEL_MODE_FLASH); - WARN_ON(!channel_flash); + if (WARN_ON(!channel_flash)) + return -EINVAL; fled = &channel_flash->fled; -- 2.44.0

1 year

[PATCH v3 00/32] spi: get rid of some legacy macros

by Uwe Kleine-König

Changes since v2 (https://lore.kernel.org/linux-spi/cover.1705944943.git.u.kleine-koenig@peng…): - Drop patch "mtd: rawnand: fsl_elbc: Let .probe retry if local bus is missing" which doesn't belong into this series. - Fix a build failure noticed by the kernel build bot in drivers/spi/spi-au1550.c. (I failed to catch this because this driver is mips only, but not enabled in a mips allmodconfig. That's a bit unfortunate, but not easily fixable.) - Add the Reviewed-by: and Acked-by: tags I received for v2. Mark already announced for v2 that he is willing to apply the whole series to his spi tree. Assuming no other show stoper are found in this v3, I assume that's the plan still for this series now. Thanks Uwe Uwe Kleine-König (32): fpga: ice40-spi: Follow renaming of SPI "master" to "controller" ieee802154: ca8210: Follow renaming of SPI "master" to "controller" iio: adc: ad_sigma_delta: Follow renaming of SPI "master" to "controller" Input: pxspad - follow renaming of SPI "master" to "controller" Input: synaptics-rmi4 - follow renaming of SPI "master" to "controller" media: mgb4: Follow renaming of SPI "master" to "controller" media: netup_unidvb: Follow renaming of SPI "master" to "controller" media: usb/msi2500: Follow renaming of SPI "master" to "controller" media: v4l2-subdev: Follow renaming of SPI "master" to "controller" misc: gehc-achc: Follow renaming of SPI "master" to "controller" mmc: mmc_spi: Follow renaming of SPI "master" to "controller" mtd: dataflash: Follow renaming of SPI "master" to "controller" net: ks8851: Follow renaming of SPI "master" to "controller" net: vertexcom: mse102x: Follow renaming of SPI "master" to "controller" platform/chrome: cros_ec_spi: Follow renaming of SPI "master" to "controller" spi: bitbang: Follow renaming of SPI "master" to "controller" spi: cadence-quadspi: Don't emit error message on allocation error spi: cadence-quadspi: Follow renaming of SPI "master" to "controller" spi: cavium: Follow renaming of SPI "master" to "controller" spi: geni-qcom: Follow renaming of SPI "master" to "controller" spi: loopback-test: Follow renaming of SPI "master" to "controller" spi: slave-mt27xx: Follow renaming of SPI "master" to "controller" spi: spidev: Follow renaming of SPI "master" to "controller" staging: fbtft: Follow renaming of SPI "master" to "controller" staging: greybus: spi: Follow renaming of SPI "master" to "controller" tpm_tis_spi: Follow renaming of SPI "master" to "controller" usb: gadget: max3420_udc: Follow renaming of SPI "master" to "controller" video: fbdev: mmp: Follow renaming of SPI "master" to "controller" wifi: libertas: Follow renaming of SPI "master" to "controller" spi: fsl-lib: Follow renaming of SPI "master" to "controller" spi: Drop compat layer from renaming "master" to "controller" Documentation: spi: Update documentation for renaming "master" to "controller" .../driver-api/driver-model/devres.rst | 2 +- Documentation/spi/spi-summary.rst | 74 +++++++++---------- drivers/char/tpm/tpm_tis_spi_main.c | 4 +- drivers/fpga/ice40-spi.c | 4 +- drivers/iio/adc/ad_sigma_delta.c | 14 ++-- drivers/input/joystick/psxpad-spi.c | 4 +- drivers/input/rmi4/rmi_spi.c | 2 +- drivers/media/pci/mgb4/mgb4_core.c | 14 ++-- .../media/pci/netup_unidvb/netup_unidvb_spi.c | 48 ++++++------ drivers/media/usb/msi2500/msi2500.c | 38 +++++----- drivers/media/v4l2-core/v4l2-spi.c | 4 +- drivers/misc/gehc-achc.c | 8 +- drivers/mmc/host/mmc_spi.c | 6 +- drivers/mtd/devices/mtd_dataflash.c | 2 +- drivers/net/ethernet/micrel/ks8851_spi.c | 4 +- drivers/net/ethernet/vertexcom/mse102x.c | 2 +- drivers/net/ieee802154/ca8210.c | 2 +- .../net/wireless/marvell/libertas/if_spi.c | 2 +- drivers/platform/chrome/cros_ec_spi.c | 8 +- drivers/spi/spi-ath79.c | 4 +- drivers/spi/spi-au1550.c | 2 +- drivers/spi/spi-bitbang.c | 64 ++++++++-------- drivers/spi/spi-butterfly.c | 6 +- drivers/spi/spi-cadence-quadspi.c | 7 +- drivers/spi/spi-cavium.c | 6 +- drivers/spi/spi-cavium.h | 2 +- drivers/spi/spi-davinci.c | 6 +- drivers/spi/spi-fsl-lib.c | 14 ++-- drivers/spi/spi-geni-qcom.c | 2 +- drivers/spi/spi-gpio.c | 2 +- drivers/spi/spi-lm70llp.c | 6 +- drivers/spi/spi-loopback-test.c | 4 +- drivers/spi/spi-oc-tiny.c | 6 +- drivers/spi/spi-omap-uwire.c | 4 +- drivers/spi/spi-sh-sci.c | 10 +-- drivers/spi/spi-slave-mt27xx.c | 2 +- drivers/spi/spi-xilinx.c | 4 +- drivers/spi/spi-xtensa-xtfpga.c | 2 +- drivers/spi/spi.c | 2 +- drivers/spi/spidev.c | 2 +- drivers/staging/fbtft/fbtft-core.c | 4 +- drivers/staging/greybus/spilib.c | 66 ++++++++--------- drivers/usb/gadget/udc/max3420_udc.c | 2 +- drivers/video/fbdev/mmp/hw/mmp_spi.c | 26 +++---- include/linux/spi/spi.h | 20 +---- include/linux/spi/spi_bitbang.h | 2 +- include/media/v4l2-common.h | 6 +- 47 files changed, 253 insertions(+), 272 deletions(-) base-commit: b9b98f594b6f4c0b0fb2da4493453aef183bca4b -- 2.43.0

1 year

[PATCH v6 000/164] pwm: Improve lifetime tracking for pwm_chips

by Uwe Kleine-König

Hello, this is v6 of the series introducing better lifetime tracking for pwmchips that addresses (for now theoretic) lifetime issues of pwm chips. Addressing these is a necessary precondition to introduce chardev support for PWMs. Locking got more complicated due to non-sleeping chips, so I dropped the character device patch because it got still more incomplete now. Also I'm not yet entirely sure about patches #162 and #163 and I expect them to change before they can go in. My plan for the next merge window is to get the patches in up to #160. After that the addition of chardev support (including correct locking) can continue without having to touch the lowlevel driver. So the idea of this series is to get the driver adaptions out of the way as this requires some cross-tree coordination. The patches that touch files outside of drivers/pwm include: - gpio: mvebu: Make use of devm_pwmchip_alloc() function It already has an Ack by Linus Walleij. - drm/bridge: ti-sn65dsi86: Make use of pwmchip_parent() accessor - drm/bridge: ti-sn65dsi86: Make use of devm_pwmchip_alloc() function The 2nd already has an Ack by Douglas Anderson which I tend to assume good enough to merge this via my pwm tree, too. An Ack for the first patch would be nice. - leds: qcom-lpg: Make use of devm_pwmchip_alloc() function Already has an Ack by Lee Jones. - staging: greybus: pwm: Change prototype of helpers to prepare further changes - staging: greybus: pwm: Make use of pwmchip_parent() accessor - staging: greybus: pwm: Rely on pwm framework to pass a valid hwpwm - staging: greybus: pwm: Drop unused gb_connection_set_data() - staging: greybus: pwm: Rework how the number of PWM lines is determined - staging: greybus: pwm: Make use of devm_pwmchip_alloc() function The greybus patches already got an Ack by Greg Kroah-Hartman in an earlier series, but I dropped it as the patches changed considerably. For the patches that already have an Ack by the respective maintainers I'll assume this is good enough to merge the patches via the pwm tree. Please object if you don't agree. For the others an Ack with that semantic would be nice. If you want to merge via your tree, that would need some coordination. The adaptions depend on patches #1 - #3, so this would involve an immutable branch or waiting until these patches reached your tree via the mainline tree. The series rebases fine on today's next, so at least for now there are no conflicts that git cannot resolve automatically. The biggest changes compared to v5 are: - Make pwmchip_parent's parameter const - Use pwmchip_parent also in drivers/pwm/sysfs.c and drivers/pwm/core.c - Several bug fixes in the conversions I found during the rework - Provide a non-devm pwmchip_alloc() function earlier (for the greybus pwm driver) - Increase alignment of driver private data to ARCH_DMA_MINALIGN bytes - Split several patches to make the easier reviewable The series is available via git at https://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux.git pwm-lifetime-tracking if you want to give it a test. I'll keep this branch updated for the feedback I get here. Best regards Uwe Uwe Kleine-König (164): pwm: Provide an inline function to get the parent device of a given chip pwm: Provide wrappers for storing and getting driver private data pwm: Provide pwmchip_alloc() function and a devm variant of it pwm: ab8500: Make use of pwmchip_parent() accessor pwm: ab8500: Introduce a local pwm_chip variable in .probe() pwm: ab8500: Make use of devm_pwmchip_alloc() function pwm: apple: Make use of devm_pwmchip_alloc() function pwm: atmel: Change prototype of a helper to prepare further changes pwm: atmel: Make use of pwmchip_parent() accessor pwm: atmel: Make use of devm_pwmchip_alloc() function pwm: atmel-hlcdc: Prepare removing pwm_chip from driver data pwm: atmel-hlcdc: Make use of devm_pwmchip_alloc() function pwm: atmel-tcb: Make use of pwmchip_parent() accessor pwm: atmel-tcb: Prepare removing pwm_chip from driver data pwm: atmel-tcb: Make use of devm_pwmchip_alloc() function pwm: bcm2835: Make use of devm_pwmchip_alloc() function pwm: bcm-iproc: Make use of devm_pwmchip_alloc() function pwm: bcm-kona: Make use of pwmchip_parent() accessor pwm: bcm-kona: Make use of devm_pwmchip_alloc() function pwm: berlin: Prepare removing pwm_chip from driver data pwm: berlin: Make use of devm_pwmchip_alloc() function pwm: brcmstb: Make use of devm_pwmchip_alloc() function pwm: clk: Prepare removing pwm_chip from driver data pwm: clk: Make use of devm_pwmchip_alloc() function pwm: clps711x: Make use of devm_pwmchip_alloc() function pwm: crc: Simplify code to determine the pwmchip's parent device pwm: crc: Make use of pwmchip_parent() accessor pwm: crc: Make use of devm_pwmchip_alloc() function pwm: cros-ec: Change prototype of helpers to prepare further changes pwm: cros-ec: Make use of pwmchip_parent() accessor pwm: cros-ec: Make use of devm_pwmchip_alloc() function pwm: dwc: Prepare removing pwm_chip from driver data pwm: dwc: Make use of devm_pwmchip_alloc() function pwm: dwc-core: Make use of pwmchip_parent() accessor pwm: ep93xx: Make use of pwmchip_parent() accessor pwm: ep93xx: Make use of devm_pwmchip_alloc() function pwm: fsl-ftm: Change prototype of a helper to prepare further changes pwm: fsl-ftm: Make use of pwmchip_parent() accessor pwm: fsl-ftm: Prepare removing pwm_chip from driver data pwm: fsl-ftm: Make use of devm_pwmchip_alloc() function pwm: hibvt: Consistently name driver data hi_pwm_chip pwm: hibvt: Make use of devm_pwmchip_alloc() function pwm: img: Drop write-only variable from driver private data pwm: img: Make use of pwmchip_parent() accessor pwm: img: Prepare removing pwm_chip from driver data pwm: img: Make use of devm_pwmchip_alloc() function pwm: imx1: Make use of devm_pwmchip_alloc() function pwm: imx27: Make use of pwmchip_parent() accessor pwm: imx27: Make use of devm_pwmchip_alloc() function pwm: imx-tpm: Make use of devm_pwmchip_alloc() function pwm: intel-lgm: Make use of devm_pwmchip_alloc() function pwm: iqs620a: Create a wrapper for converting a pwm_chip to driver data pwm: iqs620a: Prepare removing pwm_chip from driver data pwm: iqs620a: Make use of devm_pwmchip_alloc() function pwm: jz4740: Change prototype of a helper to prepare further changes pwm: jz4740: Make use of pwmchip_parent() accessor pwm: jz4740: Make use of devm_pwmchip_alloc() function pwm: keembay: Make use of devm_pwmchip_alloc() function pwm: lp3943: Make use of devm_pwmchip_alloc() function pwm: lpc18xx-sct: Drop hardly used member from driver private data pwm: lpc18xx-sct: Make use of pwmchip_parent() accessor pwm: lpc18xx-sct: Prepare removing pwm_chip from driver data pwm: lpc18xx-sct: Make use of devm_pwmchip_alloc() function pwm: lpc32xx: Make use of devm_pwmchip_alloc() function pwm: lpss: Make use of pwmchip_parent() accessor pwm: lpss: Don't set driver data pwm: lpss-*: Make use of devm_pwmchip_alloc() function pwm: mediatek: Make use of pwmchip_parent() accessor pwm: mediatek: Make use of devm_pwmchip_alloc() function pwm: meson: Change prototype of a few helpers to prepare further changes pwm: meson: Make use of pwmchip_parent() accessor pwm: meson: Make use of devm_pwmchip_alloc() function pwm: microchip-core: Make use of devm_pwmchip_alloc() function pwm: mtk-disp: Make use of pwmchip_parent() accessor pwm: mtk-disp: Make use of devm_pwmchip_alloc() function pwm: mxs: Make use of devm_pwmchip_alloc() function pwm: ntxec: Make use of devm_pwmchip_alloc() function pwm: omap-dmtimer: Make use of pwmchip_parent() accessor pwm: omap-dmtimer: Prepare removing pwm_chip from driver data pwm: omap-dmtimer: Make use of devm_pwmchip_alloc() function pwm: pca9685: Prepare removing pwm_chip from driver data pwm: pca9685: Make use of pwmchip_parent() accessor pwm: pca9685: Make use of devm_pwmchip_alloc() function pwm: pxa: Make use of devm_pwmchip_alloc() function pwm: raspberrypi-poe: Make use of pwmchip_parent() accessor pwm: raspberrypi-poe: Make use of devm_pwmchip_alloc() function pwm: rcar: Make use of pwmchip_parent() accessor pwm: rcar: Prepare removing pwm_chip from driver data pwm: rcar: Make use of devm_pwmchip_alloc() function pwm: renesas-tpu: Make use of devm_pwmchip_alloc() function pwm: rochchip: Prepare removing pwm_chip from driver data pwm: rockchip: Make use of devm_pwmchip_alloc() function pwm: rz-mtu3: Make use of pwmchip_parent() accessor pwm: rz-mtu3: Prepare removing pwm_chip from driver data pwm: rz-mtu3: Make use of devm_pwmchip_alloc() function pwm: samsung: Simplify code to determine the pwmchip's parent device pwm: samsung: Change prototype of helpers to prepare further changes pwm: samsung: Make use of pwmchip_parent() accessor pwm: samsung: Simplify by using devm functions in probe pwm: samsung: Simplify using dev_err_probe() pwm: samsung: Make use of devm_pwmchip_alloc() function pwm: sifive: Simplify code to determine the pwmchip's parent device pwm: sifive: Prepare removing pwm_chip from driver data pwm: sifive: Make use of pwmchip_parent() accessor pwm: sifive: Make use of devm_pwmchip_alloc() function pwm: sl28cpld: Make use of devm_pwmchip_alloc() function pwm: spear: Make use of devm_pwmchip_alloc() function pwm: sprd: Rework how the available channels are counted pwm: sprd: Drop duplicated tracking of the parent device pwm: sprd: Make use of devm_pwmchip_alloc() function pwm: sti: Prepare removing pwm_chip from driver data pwm: sti: Make use of devm_pwmchip_alloc() function pwm: stm32: Simplify code to determine the pwmchip's parent device pwm: stm32: Change prototype of a helper to prepare further changes pwm: stm32: Prepare removing pwm_chip from driver data pwm: stm32: Change prototype of helper that detects npwm to prepare further changes pwm: stm32: Make use of devm_pwmchip_alloc() function pwm: stm32-lp: Simplify code to determine the pwmchip's parent device pwm: stm32-lp: Prepare removing pwm_chip from driver data pwm: stm32-lp: Make use of pwmchip_parent() accessor pwm: stm32-lp: Make use of devm_pwmchip_alloc() function pwm: stmpe: Make use of pwmchip_parent() accessor pwm: stmpe: Make use of devm_pwmchip_alloc() function pwm: sun4i: Make use of pwmchip_parent() accessor pwm: sun4i: Prepare removing pwm_chip from driver data pwm: sun4i: Consistently name driver data sun4ichip pwm: sun4i: Make use of devm_pwmchip_alloc() function pwm: sunplus: Make use of devm_pwmchip_alloc() function pwm: tegra: Drop duplicated tracking of the parent device pwm: tegra: Prepare removing pwm_chip from driver data pwm: tegra: Make use of devm_pwmchip_alloc() function pwm: tiecap: Simplify code to determine the pwmchip's parent device pwm: tiecap: Change prototype of helpers to prepare further changes pwm: tiecap: Make use of pwmchip_parent() accessor pwm: tiecap: Make use of devm_pwmchip_alloc() function pwm: tiehrpwm: Simplify code to determine the pwmchip's parent device pwm: tiehrpwm: Change prototype of helpers to prepare further changes pwm: tiehrpwm: Make use of pwmchip_parent() accessor pwm: tiehrpwm: Make use of devm_pwmchip_alloc() function pwm: twl: Make use of pwmchip_parent() accessor pwm: twl: Make use of devm_pwmchip_alloc() function pwm: twl-led: Make use of pwmchip_parent() accessor pwm: twl-led: Make use of devm_pwmchip_alloc() function pwm: visconti: Make use of devm_pwmchip_alloc() function pwm: vt8500: Change prototype of a helper to prepare further changes pwm: vt8500: Introduce a local pwm_chip variable in .probe() pwm: vt8500: Make use of pwmchip_parent() accessor pwm: vt8500: Make use of devm_pwmchip_alloc() function pwm: xilinx: Prepare removing pwm_chip from driver data pwm: xilinx: Make use of devm_pwmchip_alloc() function gpio: mvebu: Make use of devm_pwmchip_alloc() function drm/bridge: ti-sn65dsi86: Make use of pwmchip_parent() accessor drm/bridge: ti-sn65dsi86: Make use of devm_pwmchip_alloc() function leds: qcom-lpg: Make use of devm_pwmchip_alloc() function staging: greybus: pwm: Change prototype of helpers to prepare further changes staging: greybus: pwm: Make use of pwmchip_parent() accessor staging: greybus: pwm: Rely on pwm framework to pass a valid hwpwm staging: greybus: pwm: Drop unused gb_connection_set_data() staging: greybus: pwm: Rework how the number of PWM lines is determined staging: greybus: pwm: Make use of devm_pwmchip_alloc() function pwm: Ensure that pwm_chips are allocated using pwmchip_alloc() pwm: Ensure a struct pwm has the same lifetime as its pwm_chip pwm: Ensure the memory backing a PWM chip isn't freed while used pwm: Make pwmchip_[sg]et_drvdata() a wrapper around dev_set_drvdata() .../driver-api/driver-model/devres.rst | 1 + Documentation/driver-api/pwm.rst | 11 +- drivers/gpio/gpio-mvebu.c | 18 +- drivers/gpu/drm/bridge/ti-sn65dsi86.c | 31 +-- drivers/leds/rgb/leds-qcom-lpg.c | 16 +- drivers/pinctrl/intel/pinctrl-intel.c | 6 +- drivers/pwm/Kconfig | 4 - drivers/pwm/Makefile | 3 +- drivers/pwm/core.c | 184 +++++++++++++----- drivers/pwm/pwm-ab8500.c | 36 ++-- drivers/pwm/pwm-apple.c | 18 +- drivers/pwm/pwm-atmel-hlcdc.c | 37 ++-- drivers/pwm/pwm-atmel-tcb.c | 32 +-- drivers/pwm/pwm-atmel.c | 34 ++-- drivers/pwm/pwm-bcm-iproc.c | 19 +- drivers/pwm/pwm-bcm-kona.c | 23 ++- drivers/pwm/pwm-bcm2835.c | 19 +- drivers/pwm/pwm-berlin.c | 29 +-- drivers/pwm/pwm-brcmstb.c | 17 +- drivers/pwm/pwm-clk.c | 27 +-- drivers/pwm/pwm-clps711x.c | 17 +- drivers/pwm/pwm-crc.c | 22 +-- drivers/pwm/pwm-cros-ec.c | 58 +++--- drivers/pwm/pwm-dwc-core.c | 26 +-- drivers/pwm/pwm-dwc.c | 17 +- drivers/pwm/pwm-dwc.h | 9 +- drivers/pwm/pwm-ep93xx.c | 21 +- drivers/pwm/pwm-fsl-ftm.c | 49 ++--- drivers/pwm/pwm-hibvt.c | 70 ++++--- drivers/pwm/pwm-img.c | 60 +++--- drivers/pwm/pwm-imx-tpm.c | 34 ++-- drivers/pwm/pwm-imx1.c | 20 +- drivers/pwm/pwm-imx27.c | 26 +-- drivers/pwm/pwm-intel-lgm.c | 17 +- drivers/pwm/pwm-iqs620a.c | 30 +-- drivers/pwm/pwm-jz4740.c | 36 ++-- drivers/pwm/pwm-keembay.c | 17 +- drivers/pwm/pwm-lp3943.c | 17 +- drivers/pwm/pwm-lpc18xx-sct.c | 34 ++-- drivers/pwm/pwm-lpc32xx.c | 21 +- drivers/pwm/pwm-lpss-pci.c | 10 +- drivers/pwm/pwm-lpss-platform.c | 10 +- drivers/pwm/pwm-lpss.c | 34 ++-- drivers/pwm/pwm-lpss.h | 1 - drivers/pwm/pwm-mediatek.c | 29 +-- drivers/pwm/pwm-meson.c | 57 +++--- drivers/pwm/pwm-microchip-core.c | 17 +- drivers/pwm/pwm-mtk-disp.c | 25 ++- drivers/pwm/pwm-mxs.c | 32 +-- drivers/pwm/pwm-ntxec.c | 14 +- drivers/pwm/pwm-omap-dmtimer.c | 47 +++-- drivers/pwm/pwm-pca9685.c | 161 +++++++-------- drivers/pwm/pwm-pxa.c | 21 +- drivers/pwm/pwm-raspberrypi-poe.c | 20 +- drivers/pwm/pwm-rcar.c | 27 ++- drivers/pwm/pwm-renesas-tpu.c | 20 +- drivers/pwm/pwm-rockchip.c | 24 +-- drivers/pwm/pwm-rz-mtu3.c | 60 +++--- drivers/pwm/pwm-samsung.c | 94 ++++----- drivers/pwm/pwm-sifive.c | 30 +-- drivers/pwm/pwm-sl28cpld.c | 13 +- drivers/pwm/pwm-spear.c | 18 +- drivers/pwm/pwm-sprd.c | 58 +++--- drivers/pwm/pwm-sti.c | 61 +++--- drivers/pwm/pwm-stm32-lp.c | 31 ++- drivers/pwm/pwm-stm32.c | 56 +++--- drivers/pwm/pwm-stmpe.c | 58 +++--- drivers/pwm/pwm-sun4i.c | 100 +++++----- drivers/pwm/pwm-sunplus.c | 17 +- drivers/pwm/pwm-tegra.c | 50 ++--- drivers/pwm/pwm-tiecap.c | 55 +++--- drivers/pwm/pwm-tiehrpwm.c | 72 +++---- drivers/pwm/pwm-twl-led.c | 55 +++--- drivers/pwm/pwm-twl.c | 50 +++-- drivers/pwm/pwm-visconti.c | 17 +- drivers/pwm/pwm-vt8500.c | 43 ++-- drivers/pwm/pwm-xilinx.c | 34 ++-- drivers/pwm/sysfs.c | 45 +---- drivers/staging/greybus/pwm.c | 133 ++++++------- include/linux/platform_data/x86/pwm-lpss.h | 4 +- include/linux/pwm.h | 56 ++++-- 81 files changed, 1502 insertions(+), 1423 deletions(-) base-commit: ab105bfee27776dd946f8003d1e895fbf7674a3f -- 2.43.0

1 year

[PATCH v2] treewide, serdev: change receive_buf() return type to size_t

by Francesco Dolcini

From: Francesco Dolcini <francesco.dolcini(a)toradex.com> receive_buf() is called from ttyport_receive_buf() that expects values ">= 0" from serdev_controller_receive_buf(), change its return type from ssize_t to size_t. The need for this clean-up was noticed while fixing a warning, see commit 94d053942544 ("Bluetooth: btnxpuart: fix recv_buf() return value"). Changing the callback prototype to return an unsigned seems the best way to document the API and ensure that is properly used. GNSS drivers implementation of serdev receive_buf() callback return directly the return value of gnss_insert_raw(). gnss_insert_raw() returns a signed int, however this is not an issue since the value returned is always positive, because of the kfifo_in() implementation. gnss_insert_raw() could be changed to return also an unsigned, however this is not implemented here as request by the GNSS maintainer Johan Hovold. Suggested-by: Jiri Slaby <jirislaby(a)kernel.org> Link: https://lore.kernel.org/all/087be419-ec6b-47ad-851a-5e1e3ea5cfcc@kernel.org/ Signed-off-by: Francesco Dolcini <francesco.dolcini(a)toradex.com> Acked-by: Jonathan Cameron <Jonathan.Cameron(a)huawei.com> #for-iio --- v1: - https://lore.kernel.org/all/20231214170146.641783-1-francesco@dolcini.it/ v2: - rebased on 6.8-rc1 - add acked-by Jonathan - do not change gnss_insert_raw() - do not change the code style of the gnss code - commit message improvements, explain the reasons for doing only minimal changes on the GNSS part --- drivers/bluetooth/btmtkuart.c | 4 ++-- drivers/bluetooth/btnxpuart.c | 4 ++-- drivers/bluetooth/hci_serdev.c | 4 ++-- drivers/gnss/serial.c | 2 +- drivers/gnss/sirf.c | 2 +- drivers/greybus/gb-beagleplay.c | 6 +++--- drivers/iio/chemical/pms7003.c | 4 ++-- drivers/iio/chemical/scd30_serial.c | 4 ++-- drivers/iio/chemical/sps30_serial.c | 4 ++-- drivers/iio/imu/bno055/bno055_ser_core.c | 4 ++-- drivers/mfd/rave-sp.c | 4 ++-- drivers/net/ethernet/qualcomm/qca_uart.c | 2 +- drivers/nfc/pn533/uart.c | 4 ++-- drivers/nfc/s3fwrn5/uart.c | 4 ++-- drivers/platform/chrome/cros_ec_uart.c | 4 ++-- drivers/platform/surface/aggregator/core.c | 4 ++-- drivers/tty/serdev/serdev-ttyport.c | 10 ++++------ include/linux/serdev.h | 8 ++++---- sound/drivers/serial-generic.c | 4 ++-- 19 files changed, 40 insertions(+), 42 deletions(-) diff --git a/drivers/bluetooth/btmtkuart.c b/drivers/bluetooth/btmtkuart.c index 3c84fcbda01a..e6bc4a73c9fc 100644 --- a/drivers/bluetooth/btmtkuart.c +++ b/drivers/bluetooth/btmtkuart.c @@ -383,8 +383,8 @@ static void btmtkuart_recv(struct hci_dev *hdev, const u8 *data, size_t count) } } -static ssize_t btmtkuart_receive_buf(struct serdev_device *serdev, - const u8 *data, size_t count) +static size_t btmtkuart_receive_buf(struct serdev_device *serdev, + const u8 *data, size_t count) { struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev); diff --git a/drivers/bluetooth/btnxpuart.c b/drivers/bluetooth/btnxpuart.c index 1d592ac413d1..056bef5b2919 100644 --- a/drivers/bluetooth/btnxpuart.c +++ b/drivers/bluetooth/btnxpuart.c @@ -1264,8 +1264,8 @@ static const struct h4_recv_pkt nxp_recv_pkts[] = { { NXP_RECV_FW_REQ_V3, .recv = nxp_recv_fw_req_v3 }, }; -static ssize_t btnxpuart_receive_buf(struct serdev_device *serdev, - const u8 *data, size_t count) +static size_t btnxpuart_receive_buf(struct serdev_device *serdev, + const u8 *data, size_t count) { struct btnxpuart_dev *nxpdev = serdev_device_get_drvdata(serdev); diff --git a/drivers/bluetooth/hci_serdev.c b/drivers/bluetooth/hci_serdev.c index 39c8b567da3c..a3c3beb2806d 100644 --- a/drivers/bluetooth/hci_serdev.c +++ b/drivers/bluetooth/hci_serdev.c @@ -271,8 +271,8 @@ static void hci_uart_write_wakeup(struct serdev_device *serdev) * * Return: number of processed bytes */ -static ssize_t hci_uart_receive_buf(struct serdev_device *serdev, - const u8 *data, size_t count) +static size_t hci_uart_receive_buf(struct serdev_device *serdev, + const u8 *data, size_t count) { struct hci_uart *hu = serdev_device_get_drvdata(serdev); diff --git a/drivers/gnss/serial.c b/drivers/gnss/serial.c index baa956494e79..0e43bf6294f8 100644 --- a/drivers/gnss/serial.c +++ b/drivers/gnss/serial.c @@ -80,7 +80,7 @@ static const struct gnss_operations gnss_serial_gnss_ops = { .write_raw = gnss_serial_write_raw, }; -static ssize_t gnss_serial_receive_buf(struct serdev_device *serdev, +static size_t gnss_serial_receive_buf(struct serdev_device *serdev, const u8 *buf, size_t count) { struct gnss_serial *gserial = serdev_device_get_drvdata(serdev); diff --git a/drivers/gnss/sirf.c b/drivers/gnss/sirf.c index 6801a8fb2040..79375d14bbb6 100644 --- a/drivers/gnss/sirf.c +++ b/drivers/gnss/sirf.c @@ -160,7 +160,7 @@ static const struct gnss_operations sirf_gnss_ops = { .write_raw = sirf_write_raw, }; -static ssize_t sirf_receive_buf(struct serdev_device *serdev, +static size_t sirf_receive_buf(struct serdev_device *serdev, const u8 *buf, size_t count) { struct sirf_data *data = serdev_device_get_drvdata(serdev); diff --git a/drivers/greybus/gb-beagleplay.c b/drivers/greybus/gb-beagleplay.c index c3e90025064b..33f8fad70260 100644 --- a/drivers/greybus/gb-beagleplay.c +++ b/drivers/greybus/gb-beagleplay.c @@ -271,7 +271,7 @@ static void hdlc_rx_frame(struct gb_beagleplay *bg) } } -static ssize_t hdlc_rx(struct gb_beagleplay *bg, const u8 *data, size_t count) +static size_t hdlc_rx(struct gb_beagleplay *bg, const u8 *data, size_t count) { size_t i; u8 c; @@ -331,8 +331,8 @@ static void hdlc_deinit(struct gb_beagleplay *bg) flush_work(&bg->tx_work); } -static ssize_t gb_tty_receive(struct serdev_device *sd, const u8 *data, - size_t count) +static size_t gb_tty_receive(struct serdev_device *sd, const u8 *data, + size_t count) { struct gb_beagleplay *bg = serdev_device_get_drvdata(sd); diff --git a/drivers/iio/chemical/pms7003.c b/drivers/iio/chemical/pms7003.c index b5cf15a515d2..43025866d5b7 100644 --- a/drivers/iio/chemical/pms7003.c +++ b/drivers/iio/chemical/pms7003.c @@ -211,8 +211,8 @@ static bool pms7003_frame_is_okay(struct pms7003_frame *frame) return checksum == pms7003_calc_checksum(frame); } -static ssize_t pms7003_receive_buf(struct serdev_device *serdev, const u8 *buf, - size_t size) +static size_t pms7003_receive_buf(struct serdev_device *serdev, const u8 *buf, + size_t size) { struct iio_dev *indio_dev = serdev_device_get_drvdata(serdev); struct pms7003_state *state = iio_priv(indio_dev); diff --git a/drivers/iio/chemical/scd30_serial.c b/drivers/iio/chemical/scd30_serial.c index a47654591e55..2adb76dbb020 100644 --- a/drivers/iio/chemical/scd30_serial.c +++ b/drivers/iio/chemical/scd30_serial.c @@ -174,8 +174,8 @@ static int scd30_serdev_command(struct scd30_state *state, enum scd30_cmd cmd, u return 0; } -static ssize_t scd30_serdev_receive_buf(struct serdev_device *serdev, - const u8 *buf, size_t size) +static size_t scd30_serdev_receive_buf(struct serdev_device *serdev, + const u8 *buf, size_t size) { struct iio_dev *indio_dev = serdev_device_get_drvdata(serdev); struct scd30_serdev_priv *priv; diff --git a/drivers/iio/chemical/sps30_serial.c b/drivers/iio/chemical/sps30_serial.c index 3afa89f8acc3..a6dfbe28c914 100644 --- a/drivers/iio/chemical/sps30_serial.c +++ b/drivers/iio/chemical/sps30_serial.c @@ -210,8 +210,8 @@ static int sps30_serial_command(struct sps30_state *state, unsigned char cmd, return rsp_size; } -static ssize_t sps30_serial_receive_buf(struct serdev_device *serdev, - const u8 *buf, size_t size) +static size_t sps30_serial_receive_buf(struct serdev_device *serdev, + const u8 *buf, size_t size) { struct iio_dev *indio_dev = dev_get_drvdata(&serdev->dev); struct sps30_serial_priv *priv; diff --git a/drivers/iio/imu/bno055/bno055_ser_core.c b/drivers/iio/imu/bno055/bno055_ser_core.c index 5677bdf4f846..694ff14a3aa2 100644 --- a/drivers/iio/imu/bno055/bno055_ser_core.c +++ b/drivers/iio/imu/bno055/bno055_ser_core.c @@ -378,8 +378,8 @@ static void bno055_ser_handle_rx(struct bno055_ser_priv *priv, int status) * Also, we assume to RX one pkt per time (i.e. the HW doesn't send anything * unless we require to AND we don't queue more than one request per time). */ -static ssize_t bno055_ser_receive_buf(struct serdev_device *serdev, - const u8 *buf, size_t size) +static size_t bno055_ser_receive_buf(struct serdev_device *serdev, + const u8 *buf, size_t size) { int status; struct bno055_ser_priv *priv = serdev_device_get_drvdata(serdev); diff --git a/drivers/mfd/rave-sp.c b/drivers/mfd/rave-sp.c index 6ff84b2600c5..62a6613fb070 100644 --- a/drivers/mfd/rave-sp.c +++ b/drivers/mfd/rave-sp.c @@ -471,8 +471,8 @@ static void rave_sp_receive_frame(struct rave_sp *sp, rave_sp_receive_reply(sp, data, length); } -static ssize_t rave_sp_receive_buf(struct serdev_device *serdev, - const u8 *buf, size_t size) +static size_t rave_sp_receive_buf(struct serdev_device *serdev, + const u8 *buf, size_t size) { struct device *dev = &serdev->dev; struct rave_sp *sp = dev_get_drvdata(dev); diff --git a/drivers/net/ethernet/qualcomm/qca_uart.c b/drivers/net/ethernet/qualcomm/qca_uart.c index 223321897b96..20f50bde82ac 100644 --- a/drivers/net/ethernet/qualcomm/qca_uart.c +++ b/drivers/net/ethernet/qualcomm/qca_uart.c @@ -58,7 +58,7 @@ struct qcauart { unsigned char *tx_buffer; }; -static ssize_t +static size_t qca_tty_receive(struct serdev_device *serdev, const u8 *data, size_t count) { struct qcauart *qca = serdev_device_get_drvdata(serdev); diff --git a/drivers/nfc/pn533/uart.c b/drivers/nfc/pn533/uart.c index 2eb5978bd79e..cfbbe0713317 100644 --- a/drivers/nfc/pn533/uart.c +++ b/drivers/nfc/pn533/uart.c @@ -203,8 +203,8 @@ static int pn532_uart_rx_is_frame(struct sk_buff *skb) return 0; } -static ssize_t pn532_receive_buf(struct serdev_device *serdev, - const u8 *data, size_t count) +static size_t pn532_receive_buf(struct serdev_device *serdev, + const u8 *data, size_t count) { struct pn532_uart_phy *dev = serdev_device_get_drvdata(serdev); size_t i; diff --git a/drivers/nfc/s3fwrn5/uart.c b/drivers/nfc/s3fwrn5/uart.c index 456d3947116c..9c09c10c2a46 100644 --- a/drivers/nfc/s3fwrn5/uart.c +++ b/drivers/nfc/s3fwrn5/uart.c @@ -51,8 +51,8 @@ static const struct s3fwrn5_phy_ops uart_phy_ops = { .write = s3fwrn82_uart_write, }; -static ssize_t s3fwrn82_uart_read(struct serdev_device *serdev, - const u8 *data, size_t count) +static size_t s3fwrn82_uart_read(struct serdev_device *serdev, + const u8 *data, size_t count) { struct s3fwrn82_uart_phy *phy = serdev_device_get_drvdata(serdev); size_t i; diff --git a/drivers/platform/chrome/cros_ec_uart.c b/drivers/platform/chrome/cros_ec_uart.c index 68d80559fddc..8ea867c2a01a 100644 --- a/drivers/platform/chrome/cros_ec_uart.c +++ b/drivers/platform/chrome/cros_ec_uart.c @@ -81,8 +81,8 @@ struct cros_ec_uart { struct response_info response; }; -static ssize_t cros_ec_uart_rx_bytes(struct serdev_device *serdev, - const u8 *data, size_t count) +static size_t cros_ec_uart_rx_bytes(struct serdev_device *serdev, + const u8 *data, size_t count) { struct ec_host_response *host_response; struct cros_ec_device *ec_dev = serdev_device_get_drvdata(serdev); diff --git a/drivers/platform/surface/aggregator/core.c b/drivers/platform/surface/aggregator/core.c index 9591a28bc38a..ba550eaa06fc 100644 --- a/drivers/platform/surface/aggregator/core.c +++ b/drivers/platform/surface/aggregator/core.c @@ -227,8 +227,8 @@ EXPORT_SYMBOL_GPL(ssam_client_bind); /* -- Glue layer (serdev_device -> ssam_controller). ------------------------ */ -static ssize_t ssam_receive_buf(struct serdev_device *dev, const u8 *buf, - size_t n) +static size_t ssam_receive_buf(struct serdev_device *dev, const u8 *buf, + size_t n) { struct ssam_controller *ctrl; int ret; diff --git a/drivers/tty/serdev/serdev-ttyport.c b/drivers/tty/serdev/serdev-ttyport.c index e94e090cf0a1..3d7ae7fa5018 100644 --- a/drivers/tty/serdev/serdev-ttyport.c +++ b/drivers/tty/serdev/serdev-ttyport.c @@ -27,19 +27,17 @@ static size_t ttyport_receive_buf(struct tty_port *port, const u8 *cp, { struct serdev_controller *ctrl = port->client_data; struct serport *serport = serdev_controller_get_drvdata(ctrl); - int ret; + size_t ret; if (!test_bit(SERPORT_ACTIVE, &serport->flags)) return 0; ret = serdev_controller_receive_buf(ctrl, cp, count); - dev_WARN_ONCE(&ctrl->dev, ret < 0 || ret > count, - "receive_buf returns %d (count = %zu)\n", + dev_WARN_ONCE(&ctrl->dev, ret > count, + "receive_buf returns %zu (count = %zu)\n", ret, count); - if (ret < 0) - return 0; - else if (ret > count) + if (ret > count) return count; return ret; diff --git a/include/linux/serdev.h b/include/linux/serdev.h index 3fab88ba265e..ff78efc1f60d 100644 --- a/include/linux/serdev.h +++ b/include/linux/serdev.h @@ -27,7 +27,7 @@ struct serdev_device; * not sleep. */ struct serdev_device_ops { - ssize_t (*receive_buf)(struct serdev_device *, const u8 *, size_t); + size_t (*receive_buf)(struct serdev_device *, const u8 *, size_t); void (*write_wakeup)(struct serdev_device *); }; @@ -185,9 +185,9 @@ static inline void serdev_controller_write_wakeup(struct serdev_controller *ctrl serdev->ops->write_wakeup(serdev); } -static inline ssize_t serdev_controller_receive_buf(struct serdev_controller *ctrl, - const u8 *data, - size_t count) +static inline size_t serdev_controller_receive_buf(struct serdev_controller *ctrl, + const u8 *data, + size_t count) { struct serdev_device *serdev = ctrl->serdev; diff --git a/sound/drivers/serial-generic.c b/sound/drivers/serial-generic.c index d6e5aafd697c..36409a56c675 100644 --- a/sound/drivers/serial-generic.c +++ b/sound/drivers/serial-generic.c @@ -100,8 +100,8 @@ static void snd_serial_generic_write_wakeup(struct serdev_device *serdev) snd_serial_generic_tx_wakeup(drvdata); } -static ssize_t snd_serial_generic_receive_buf(struct serdev_device *serdev, - const u8 *buf, size_t count) +static size_t snd_serial_generic_receive_buf(struct serdev_device *serdev, + const u8 *buf, size_t count) { int ret; struct snd_serial_generic *drvdata = serdev_device_get_drvdata(serdev); -- 2.39.2

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