greybus-dev

greybus-dev@lists.linaro.org

19 participants
736 discussions

[PATCH] greybus: Omit a redundant pm_runtime_mark_last_busy() call in two functions()

by Markus Elfring

From: Markus Elfring <elfring(a)users.sourceforge.net> Date: Sat, 14 Mar 2026 16:00:20 +0100 The device's last busy timestamp was set in a wrapper function since the commit 18c1fe53d186867243f4cf17f4eef60737a16c4c ("PM: runtime: Mark last busy stamp in pm_request_autosuspend()"). Thus delete a pm_runtime_mark_last_busy() call before two pm_request_autosuspend() calls. The source code was transformed by using the Coccinelle software. Signed-off-by: Markus Elfring <elfring(a)users.sourceforge.net> --- drivers/greybus/bundle.c | 1 - drivers/greybus/interface.c | 1 - 2 files changed, 2 deletions(-) diff --git a/drivers/greybus/bundle.c b/drivers/greybus/bundle.c index d1831d0986e9..d8d8e9ba7869 100644 --- a/drivers/greybus/bundle.c +++ b/drivers/greybus/bundle.c @@ -155,7 +155,6 @@ static int gb_bundle_resume(struct device *dev) static int gb_bundle_idle(struct device *dev) { - pm_runtime_mark_last_busy(dev); pm_request_autosuspend(dev); return 0; diff --git a/drivers/greybus/interface.c b/drivers/greybus/interface.c index 4ee4bda4a267..ed56f90369d1 100644 --- a/drivers/greybus/interface.c +++ b/drivers/greybus/interface.c @@ -753,7 +753,6 @@ static int gb_interface_resume(struct device *dev) static int gb_interface_runtime_idle(struct device *dev) { - pm_runtime_mark_last_busy(dev); pm_request_autosuspend(dev); return 0; -- 2.53.0

9 hours, 33 minutes

[PATCH] staging: greybus: gbphy: Omit a redundant pm_runtime_mark_last_busy() call in gb_gbphy_idle()

by Markus Elfring

From: Markus Elfring <elfring(a)users.sourceforge.net> Date: Sat, 14 Mar 2026 15:35:09 +0100 The device's last busy timestamp was set in a wrapper function since the commit 18c1fe53d186867243f4cf17f4eef60737a16c4c ("PM: runtime: Mark last busy stamp in pm_request_autosuspend()"). Thus delete a pm_runtime_mark_last_busy() call before a pm_request_autosuspend() call. The source code was transformed by using the Coccinelle software. Signed-off-by: Markus Elfring <elfring(a)users.sourceforge.net> --- drivers/staging/greybus/gbphy.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/staging/greybus/gbphy.c b/drivers/staging/greybus/gbphy.c index bdb0f5164a6f..949656e75e8b 100644 --- a/drivers/staging/greybus/gbphy.c +++ b/drivers/staging/greybus/gbphy.c @@ -53,7 +53,6 @@ static void gbphy_dev_release(struct device *dev) #ifdef CONFIG_PM static int gb_gbphy_idle(struct device *dev) { - pm_runtime_mark_last_busy(dev); pm_request_autosuspend(dev); return 0; } -- 2.53.0

9 hours, 57 minutes

[PATCH] staging: greybus: uart: add comments to locks and fix alignment

by Rahul Joshi

The spinlock_t and struct mutex members in struct gb_tty lack comments describing what they protect, which is required by the kernel coding style. Also fix the alignment of the wait_for_completion_timeout() call in gb_uart_wait_for_all_credits() to match the open parenthesis. Signed-off-by: Rahul Joshi <rj5547884(a)gmail.com> --- drivers/staging/greybus/uart.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/staging/greybus/uart.c b/drivers/staging/greybus/uart.c index 7d060b4cd33d..52a84a68049c 100644 --- a/drivers/staging/greybus/uart.c +++ b/drivers/staging/greybus/uart.c @@ -50,12 +50,12 @@ struct gb_tty { unsigned int minor; unsigned char clocal; bool disconnected; - spinlock_t read_lock; - spinlock_t write_lock; + spinlock_t read_lock; /* protects iocount and oldcount */ + spinlock_t write_lock; /* protects write_fifo and credits */ struct async_icount iocount; struct async_icount oldcount; wait_queue_head_t wioctl; - struct mutex mutex; + struct mutex mutex; /* protects disconnected flag and device state */ u8 ctrlin; /* input control lines */ u8 ctrlout; /* output control lines */ struct gb_uart_set_line_coding_request line_coding; @@ -318,7 +318,7 @@ static int gb_uart_wait_for_all_credits(struct gb_tty *gb_tty) return 0; ret = wait_for_completion_timeout(&gb_tty->credits_complete, - msecs_to_jiffies(GB_UART_CREDIT_WAIT_TIMEOUT_MSEC)); + msecs_to_jiffies(GB_UART_CREDIT_WAIT_TIMEOUT_MSEC)); if (!ret) { dev_err(&gb_tty->gbphy_dev->dev, "time out waiting for credits\n"); -- 2.34.1

2 days, 19 hours

[PATCH] staging: greybus: uart: replace DEFINE_IDR with DEFINE_XARRAY_ALLOC

by Rahul Joshi

DEFINE_IDR is deprecated in favour of DEFINE_XARRAY_ALLOC. Replace the tty_minors IDR with an XArray and update all call sites: idr_alloc() -> xa_alloc() idr_find() -> xa_load() idr_remove() -> xa_erase() idr_destroy() -> xa_destroy() Also remove the now-unused <linux/idr.h> include and add <linux/xarray.h>. Signed-off-by: Rahul Joshi <rj5547884(a)gmail.com> --- drivers/staging/greybus/uart.c | 24 ++++++++++++++---------- 1 file changed, 14 insertions(+), 10 deletions(-) diff --git a/drivers/staging/greybus/uart.c b/drivers/staging/greybus/uart.c index 7d060b4cd33d..bed3f35a6ec2 100644 --- a/drivers/staging/greybus/uart.c +++ b/drivers/staging/greybus/uart.c @@ -22,7 +22,7 @@ #include <linux/serial.h> #include <linux/tty_driver.h> #include <linux/tty_flip.h> -#include <linux/idr.h> +#include <linux/xarray.h> #include <linux/fs.h> #include <linux/kdev_t.h> #include <linux/kfifo.h> @@ -67,7 +67,7 @@ struct gb_tty { }; static struct tty_driver *gb_tty_driver; -static DEFINE_IDR(tty_minors); +static DEFINE_XARRAY_ALLOC(tty_minors); static DEFINE_MUTEX(table_lock); static int gb_uart_receive_data_handler(struct gb_operation *op) @@ -342,7 +342,7 @@ static struct gb_tty *get_gb_by_minor(unsigned int minor) struct gb_tty *gb_tty; mutex_lock(&table_lock); - gb_tty = idr_find(&tty_minors, minor); + gb_tty = xa_load(&tty_minors, minor); if (gb_tty) { mutex_lock(&gb_tty->mutex); if (gb_tty->disconnected) { @@ -359,14 +359,18 @@ static struct gb_tty *get_gb_by_minor(unsigned int minor) static int alloc_minor(struct gb_tty *gb_tty) { - int minor; + int retval; + u32 index; mutex_lock(&table_lock); - minor = idr_alloc(&tty_minors, gb_tty, 0, GB_NUM_MINORS, GFP_KERNEL); + retval = xa_alloc(&tty_minors, &index, gb_tty, + XA_LIMIT(0, GB_NUM_MINORS - 1), GFP_KERNEL); mutex_unlock(&table_lock); - if (minor >= 0) - gb_tty->minor = minor; - return minor; + if (retval < 0) + return retval; + + gb_tty->minor = index; + return index; } static void release_minor(struct gb_tty *gb_tty) @@ -375,7 +379,7 @@ static void release_minor(struct gb_tty *gb_tty) gb_tty->minor = 0; /* Maybe should use an invalid value instead */ mutex_lock(&table_lock); - idr_remove(&tty_minors, minor); + xa_erase(&tty_minors, minor); mutex_unlock(&table_lock); } @@ -984,7 +988,7 @@ static void gb_tty_exit(void) { tty_unregister_driver(gb_tty_driver); tty_driver_kref_put(gb_tty_driver); - idr_destroy(&tty_minors); + xa_destroy(&tty_minors); } static const struct gbphy_device_id gb_uart_id_table[] = { -- 2.34.1

2 days, 19 hours

[PATCH 1/2 RESEND] greybus: raw: fix use-after-free on cdev close

by Damien Riégel

This addresses a use-after-free bug when a raw bundle is disconnected but its chardev is still opened by an application. When the application releases the cdev, it causes the following panic when init on free is enabled (CONFIG_INIT_ON_FREE_DEFAULT_ON=y): [ 78.451062] refcount_t: underflow; use-after-free. [ 78.451352] WARNING: CPU: 0 PID: 139 at lib/refcount.c:28 refcount_warn_saturate+0xd0/0x130 [ 78.451698] Modules linked in: gb_raw(C) [ 78.451881] CPU: 0 UID: 0 PID: 139 Comm: raw_chardev_tes Tainted: G WC 6.18.0-rc4 #212 PREEMPT(voluntary) [ 78.452386] Tainted: [W]=WARN, [C]=CRAP [ 78.452560] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014 [ 78.453049] RIP: 0010:refcount_warn_saturate+0xd0/0x130 [ 78.453311] Code: 0b 90 90 c3 cc cc cc cc 80 3d 4f ec 1d 01 00 0f 85 75 ff ff ff c6 05 42 ec 1d 01 01 90 48 c7 c7 e8 5b cb b4 e8 31f [ 78.453953] RSP: 0018:ffffaa0f80203ed0 EFLAGS: 00010282 [ 78.454251] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 78.454472] RDX: 0000000000000000 RSI: ffffaa0f80203d68 RDI: 00000000ffffdfff [ 78.454690] RBP: 00000000040e001f R08: 00000000ffffdfff R09: ffffffffb510c008 [ 78.454899] R10: ffffffffb505c060 R11: 0000000063666572 R12: ffff938dc210b468 [ 78.455279] R13: ffff938dc1f5e1a0 R14: ffff938dc14710c0 R15: 0000000000000000 [ 78.455549] FS: 00007f2f22741740(0000) GS:ffff938e11fbc000(0000) knlGS:0000000000000000 [ 78.455806] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 78.456129] CR2: 00007f2f228c89c3 CR3: 00000000020d0000 CR4: 00000000000006f0 [ 78.456786] Call Trace: [ 78.456936] <TASK> [ 78.457069] cdev_put+0x18/0x30 [ 78.457230] __fput+0x255/0x2a0 [ 78.457372] __x64_sys_close+0x3d/0x80 [ 78.457544] do_syscall_64+0xa4/0x290 [ 78.457697] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 78.457883] RIP: 0033:0x7f2f227d1cc7 [ 78.458097] Code: 48 89 fa 4c 89 df e8 08 ae 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44f [ 78.458692] RSP: 002b:00007fffab36fb50 EFLAGS: 00000202 ORIG_RAX: 0000000000000003 [ 78.459155] RAX: ffffffffffffffda RBX: 00007f2f22741740 RCX: 00007f2f227d1cc7 [ 78.459400] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 [ 78.459648] RBP: 00007fffab36fba8 R08: 0000000000000000 R09: 0000000000000000 [ 78.459899] R10: 0000000000000000 R11: 0000000000000202 R12: 0000558298427128 [ 78.460212] R13: 00007f2f227416d0 R14: 00005582c72cf320 R15: 00005582c72cf320 [ 78.460470] </TASK> [ 78.460571] ---[ end trace 0000000000000000 ]--- The cdev is contained in the "gb_raw" structure, which is freed in the disconnect operation. When the cdev is released at a later time, cdev_put gets an address that points to freed memory. To fix this use-after-free, convert the struct device from a pointer to being embedded, that makes the lifetime of the cdev and of this device the same. Then, use cdev_device_add, which guarantees that the device won't be released until all references to the cdev are not released. Finally, delegate the freeing of the structure to the device release function, instead of freeing immediately in the disconnect callback. Fixes: e806c7fb8e9b ("greybus: raw: add raw greybus kernel driver") Signed-off-by: Damien Riégel <damien.riegel(a)silabs.com> --- resend: added linux-staging as Cc, this list was not part of the first submission. drivers/staging/greybus/raw.c | 49 +++++++++++++++++++---------------- 1 file changed, 26 insertions(+), 23 deletions(-) diff --git a/drivers/staging/greybus/raw.c b/drivers/staging/greybus/raw.c index 71de6776739..b92214f97e3 100644 --- a/drivers/staging/greybus/raw.c +++ b/drivers/staging/greybus/raw.c @@ -21,9 +21,8 @@ struct gb_raw { struct list_head list; int list_data; struct mutex list_lock; - dev_t dev; struct cdev cdev; - struct device *device; + struct device dev; }; struct raw_data { @@ -148,6 +147,13 @@ static int gb_raw_send(struct gb_raw *raw, u32 len, const char __user *data) return retval; } +static void raw_dev_release(struct device *dev) +{ + struct gb_raw *raw = dev_get_drvdata(dev); + + kfree(raw); +} + static int gb_raw_probe(struct gb_bundle *bundle, const struct greybus_bundle_id *id) { @@ -168,11 +174,14 @@ static int gb_raw_probe(struct gb_bundle *bundle, if (!raw) return -ENOMEM; + device_initialize(&raw->dev); + dev_set_drvdata(&raw->dev, raw); + connection = gb_connection_create(bundle, le16_to_cpu(cport_desc->id), gb_raw_request_handler); if (IS_ERR(connection)) { retval = PTR_ERR(connection); - goto error_free; + goto error_put_device; } INIT_LIST_HEAD(&raw->list); @@ -187,29 +196,26 @@ static int gb_raw_probe(struct gb_bundle *bundle, goto error_connection_destroy; } - raw->dev = MKDEV(raw_major, minor); + raw->dev.devt = MKDEV(raw_major, minor); + raw->dev.class = &raw_class; + raw->dev.parent = &connection->bundle->dev; + raw->dev.release = raw_dev_release; + retval = dev_set_name(&raw->dev, "gb!raw%d", minor); + if (retval) + goto error_remove_ida; + cdev_init(&raw->cdev, &raw_fops); retval = gb_connection_enable(connection); if (retval) goto error_remove_ida; - retval = cdev_add(&raw->cdev, raw->dev, 1); + retval = cdev_device_add(&raw->cdev, &raw->dev); if (retval) goto error_connection_disable; - raw->device = device_create(&raw_class, &connection->bundle->dev, - raw->dev, raw, "gb!raw%d", minor); - if (IS_ERR(raw->device)) { - retval = PTR_ERR(raw->device); - goto error_del_cdev; - } - return 0; -error_del_cdev: - cdev_del(&raw->cdev); - error_connection_disable: gb_connection_disable(connection); @@ -219,8 +225,8 @@ static int gb_raw_probe(struct gb_bundle *bundle, error_connection_destroy: gb_connection_destroy(connection); -error_free: - kfree(raw); +error_put_device: + put_device(&raw->dev); return retval; } @@ -231,11 +237,9 @@ static void gb_raw_disconnect(struct gb_bundle *bundle) struct raw_data *raw_data; struct raw_data *temp; - // FIXME - handle removing a connection when the char device node is open. - device_destroy(&raw_class, raw->dev); - cdev_del(&raw->cdev); + cdev_device_del(&raw->cdev, &raw->dev); gb_connection_disable(connection); - ida_free(&minors, MINOR(raw->dev)); + ida_free(&minors, MINOR(raw->dev.devt)); gb_connection_destroy(connection); mutex_lock(&raw->list_lock); @@ -244,8 +248,7 @@ static void gb_raw_disconnect(struct gb_bundle *bundle) kfree(raw_data); } mutex_unlock(&raw->list_lock); - - kfree(raw); + put_device(&raw->dev); } /* -- 2.52.0

3 days, 3 hours

[PATCH] staging: greybus: gpio: add comment to mutex definition

by Rahul Joshi

The irq_lock mutex is missing a comment describing what it protects, which is required by kernel coding style. Add a comment clarifying that it serializes IRQ bus lock/unlock operations used to defer and sync pending IRQ type and mask changes to hardware. Signed-off-by: Rahul Joshi <rj5547884(a)gmail.com> --- drivers/staging/greybus/gpio.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/staging/greybus/gpio.c b/drivers/staging/greybus/gpio.c index 12185f7a982c..89c15b804b2a 100644 --- a/drivers/staging/greybus/gpio.c +++ b/drivers/staging/greybus/gpio.c @@ -39,7 +39,7 @@ struct gb_gpio_controller { struct gpio_chip chip; struct irq_chip irqc; - struct mutex irq_lock; + struct mutex irq_lock; /* protects irq bus operations */ }; static struct gpio_chip *irq_data_to_gpio_chip(struct irq_data *d) -- 2.34.1

3 days, 6 hours

[PATCH v3] greybus: es2: drop redundant device reference

by Johan Hovold

Driver core holds a reference to the USB interface and its parent USB device while the interface is bound to a driver and there is no need to take additional references unless the structures are needed after disconnect. Drop the redundant device reference to reduce cargo culting, make it easier to spot drivers where an extra reference is needed, and reduce the risk of memory leaks when drivers fail to release it. Signed-off-by: Johan Hovold <johan(a)kernel.org> --- This one needs one more spin... Sorry about the mess up. Johan Changes in v3: - drop the leftover usb_dev_put() in early error paths Changes in v2: - drop temporary udev variable as reported by the kernel test robot (W=1 warning) drivers/greybus/es2.c | 11 ++--------- 1 file changed, 2 insertions(+), 9 deletions(-) diff --git a/drivers/greybus/es2.c b/drivers/greybus/es2.c index 6ae0ac828afa..75b889fa21b4 100644 --- a/drivers/greybus/es2.c +++ b/drivers/greybus/es2.c @@ -772,7 +772,6 @@ static int check_urb_status(struct urb *urb) static void es2_destroy(struct es2_ap_dev *es2) { - struct usb_device *udev; struct urb *urb; int i; @@ -804,10 +803,7 @@ static void es2_destroy(struct es2_ap_dev *es2) gb_hd_cport_release_reserved(es2->hd, ES2_CPORT_CDSI1); gb_hd_cport_release_reserved(es2->hd, ES2_CPORT_CDSI0); - udev = es2->usb_dev; gb_hd_put(es2->hd); - - usb_put_dev(udev); } static void cport_in_callback(struct urb *urb) @@ -1257,11 +1253,10 @@ static int ap_probe(struct usb_interface *interface, bool bulk_in_found = false; bool arpc_in_found = false; - udev = usb_get_dev(interface_to_usbdev(interface)); + udev = interface_to_usbdev(interface); num_cports = apb_get_cport_count(udev); if (num_cports < 0) { - usb_put_dev(udev); dev_err(&udev->dev, "Cannot retrieve CPort count: %d\n", num_cports); return num_cports; @@ -1269,10 +1264,8 @@ static int ap_probe(struct usb_interface *interface, hd = gb_hd_create(&es2_driver, &udev->dev, ES2_GBUF_MSG_SIZE_MAX, num_cports); - if (IS_ERR(hd)) { - usb_put_dev(udev); + if (IS_ERR(hd)) return PTR_ERR(hd); - } es2 = hd_to_es2(hd); es2->hd = hd; -- 2.52.0

3 days, 16 hours

[PATCH 0/7] drivers: Simplify cleanup paths using __free

by Sanjay Chitroda

From: Sanjay Chitroda <sanjayembeddedse(a)gmail.com> Hi all, This patch series replaces manual cleanup and explicit kfree() calls with the __free attribute from <linux/cleanup.h>. This modernizes the memory management style and simplifies common error paths without altering any functional behavior. The __free attribute provides automatic scope-based cleanup, making resource management clearer and reducing the chances of missing cleanup on early returns. No functional changes are intended in this series. Testing: - Compiled with W=1 - Build-tested on i86_64 Based on: <linux-v7.0-rc2> Feel free to share your valuable input in context of the cleanup API. Thanks, Sanjay Chitroda Sanjay Chitroda (7): staging: greybus: simplify cleanup using __free iio: ssp_sensors: simplify cleanup using __free iio: st_sensors: simplify cleanup using __free media: mediatek: vcodec: simplify cleanup using __free media: chips-media: coda: simplify cleanup using __free media: allegro: simplify cleanup using __free staging: rtl8723bs: simplify cleanup using __free drivers/iio/common/ssp_sensors/ssp_spi.c | 9 +- .../iio/common/st_sensors/st_sensors_core.c | 7 +- .../media/platform/allegro-dvt/allegro-core.c | 95 +++++-------------- .../platform/chips-media/coda/coda-bit.c | 4 +- .../platform/chips-media/coda/coda-jpeg.c | 39 ++++---- .../mediatek/vcodec/common/mtk_vcodec_dbgfs.c | 3 +- drivers/staging/greybus/camera.c | 27 ++---- drivers/staging/greybus/loopback.c | 35 +++----- drivers/staging/greybus/raw.c | 6 +- .../staging/rtl8723bs/hal/rtl8723b_hal_init.c | 13 +-- drivers/staging/rtl8723bs/hal/sdio_ops.c | 37 ++------ 11 files changed, 78 insertions(+), 197 deletions(-) -- 2.34.1

3 days, 18 hours

[PATCH v2] staging: greybus: loopback: use sysfs_emit in sysfs show functions

by Luis Soza Rodriguez

As per the kernel's documentation, sysfs_emit() is the preferred way to format strings for sysfs attributes. It handles buffer overruns safely. Replace sprintf calls with sysfs_emit across all loopback sysfs show macros. Signed-off-by: Luis Soza Rodriguez <contact(a)sluisr.com> --- v2: align backslashes in macros as requested by Dan Carpenter. drivers/staging/greybus/loopback.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/staging/greybus/loopback.c b/drivers/staging/greybus/loopback.c index aa9c73cb0..3a502d89d 100644 --- a/drivers/staging/greybus/loopback.c +++ b/drivers/staging/greybus/loopback.c @@ -125,7 +125,7 @@ static ssize_t field##_show(struct device *dev, \ char *buf) \ { \ struct gb_loopback *gb = dev_get_drvdata(dev); \ - return sprintf(buf, "%u\n", gb->field); \ + return sysfs_emit(buf, "%u\n", gb->field); \ } \ static DEVICE_ATTR_RO(field) @@ -137,8 +137,8 @@ static ssize_t name##_##field##_show(struct device *dev, \ struct gb_loopback *gb = dev_get_drvdata(dev); \ /* Report 0 for min and max if no transfer succeeded */ \ if (!gb->requests_completed) \ - return sprintf(buf, "0\n"); \ - return sprintf(buf, "%" #type "\n", gb->name.field); \ + return sysfs_emit(buf, "0\n"); \ + return sysfs_emit(buf, "%" #type "\n", gb->name.field); \ } \ static DEVICE_ATTR_RO(name##_##field) @@ -158,7 +158,7 @@ static ssize_t name##_avg_show(struct device *dev, \ rem = do_div(avg, count); \ rem *= 1000000; \ do_div(rem, count); \ - return sprintf(buf, "%llu.%06u\n", avg, (u32)rem); \ + return sysfs_emit(buf, "%llu.%06u\n", avg, (u32)rem); \ } \ static DEVICE_ATTR_RO(name##_avg) @@ -173,7 +173,7 @@ static ssize_t field##_show(struct device *dev, \ char *buf) \ { \ struct gb_loopback *gb = dev_get_drvdata(dev); \ - return sprintf(buf, "%" #type "\n", gb->field); \ + return sysfs_emit(buf, "%" #type "\n", gb->field); \ } \ static ssize_t field##_store(struct device *dev, \ struct device_attribute *attr, \ @@ -199,7 +199,7 @@ static ssize_t field##_show(struct device *dev, \ char *buf) \ { \ struct gb_loopback *gb = dev_get_drvdata(dev); \ - return sprintf(buf, "%u\n", gb->field); \ + return sysfs_emit(buf, "%u\n", gb->field); \ } \ static DEVICE_ATTR_RO(field) @@ -209,7 +209,7 @@ static ssize_t field##_show(struct device *dev, \ char *buf) \ { \ struct gb_loopback *gb = dev_get_drvdata(dev); \ - return sprintf(buf, "%" #type "\n", gb->field); \ + return sysfs_emit(buf, "%" #type "\n", gb->field); \ } \ static ssize_t field##_store(struct device *dev, \ struct device_attribute *attr, \ -- 2.53.0

4 days, 17 hours

[PATCH] staging: greybus: loopback: use sysfs_emit in sysfs show functions

by Luis Soza Rodriguez

As per the kernel's documentation, sysfs_emit() is the preferred way to format strings for sysfs attributes. It handles buffer overruns safely. Replace sprintf calls with sysfs_emit across all loopback sysfs show macros. Signed-off-by: Luis Soza Rodriguez <contact(a)sluisr.com> --- drivers/staging/greybus/loopback.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/staging/greybus/loopback.c b/drivers/staging/greybus/loopback.c index aa9c73cb0..3a502d89d 100644 --- a/drivers/staging/greybus/loopback.c +++ b/drivers/staging/greybus/loopback.c @@ -125,7 +125,7 @@ static ssize_t field##_show(struct device *dev, \ char *buf) \ { \ struct gb_loopback *gb = dev_get_drvdata(dev); \ - return sprintf(buf, "%u\n", gb->field); \ + return sysfs_emit(buf, "%u\n", gb->field); \ } \ static DEVICE_ATTR_RO(field) @@ -137,8 +137,8 @@ static ssize_t name##_##field##_show(struct device *dev, \ struct gb_loopback *gb = dev_get_drvdata(dev); \ /* Report 0 for min and max if no transfer succeeded */ \ if (!gb->requests_completed) \ - return sprintf(buf, "0\n"); \ - return sprintf(buf, "%" #type "\n", gb->name.field); \ + return sysfs_emit(buf, "0\n"); \ + return sysfs_emit(buf, "%" #type "\n", gb->name.field); \ } \ static DEVICE_ATTR_RO(name##_##field) @@ -158,7 +158,7 @@ static ssize_t name##_avg_show(struct device *dev, \ rem = do_div(avg, count); \ rem *= 1000000; \ do_div(rem, count); \ - return sprintf(buf, "%llu.%06u\n", avg, (u32)rem); \ + return sysfs_emit(buf, "%llu.%06u\n", avg, (u32)rem); \ } \ static DEVICE_ATTR_RO(name##_avg) @@ -173,7 +173,7 @@ static ssize_t field##_show(struct device *dev, \ char *buf) \ { \ struct gb_loopback *gb = dev_get_drvdata(dev); \ - return sprintf(buf, "%" #type "\n", gb->field); \ + return sysfs_emit(buf, "%" #type "\n", gb->field); \ } \ static ssize_t field##_store(struct device *dev, \ struct device_attribute *attr, \ @@ -199,7 +199,7 @@ static ssize_t field##_show(struct device *dev, \ char *buf) \ { \ struct gb_loopback *gb = dev_get_drvdata(dev); \ - return sprintf(buf, "%u\n", gb->field); \ + return sysfs_emit(buf, "%u\n", gb->field); \ } \ static DEVICE_ATTR_RO(field) @@ -209,7 +209,7 @@ static ssize_t field##_show(struct device *dev, \ char *buf) \ { \ struct gb_loopback *gb = dev_get_drvdata(dev); \ - return sprintf(buf, "%" #type "\n", gb->field); \ + return sysfs_emit(buf, "%" #type "\n", gb->field); \ } \ static ssize_t field##_store(struct device *dev, \ struct device_attribute *attr, \ -- 2.53.0

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