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[PATCH AUTOSEL 6.18] scsi: mpi3mr: Prevent duplicate SAS/SATA device entries in channel 1

by Sasha Levin

From: Suganath Prabu S <suganath-prabu.subramani(a)broadcom.com> [ Upstream commit 4588e65cfd66fc8bbd9969ea730db39b60a36a30 ] Avoid scanning SAS/SATA devices in channel 1 when SAS transport is enabled, as the SAS/SATA devices are exposed through channel 0. Signed-off-by: Suganath Prabu S <suganath-prabu.subramani(a)broadcom.com> Signed-off-by: Ranjan Kumar <ranjan.kumar(a)broadcom.com> Link: https://lore.kernel.org/stable/20251120071955.463475-1-suganath-prabu.subra… Link: https://patch.msgid.link/20251120071955.463475-1-suganath-prabu.subramani@b… Signed-off-by: Martin K. Petersen <martin.petersen(a)oracle.com> Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- LLM Generated explanations, may be completely bogus: ### DEPENDENCY VERIFICATION The `non_stl` field and `sas_transport_enabled` were both introduced in commit c4723e68a0d81 ("scsi: mpi3mr: Enable STL on HBAs where multipath is disabled") from August 2022 (Linux 6.0 cycle). This means the patch is only applicable to stable kernels 6.1.y and later (not 5.15.y). ### SUMMARY **Bug being fixed**: Duplicate SAS/SATA device entries appearing in both channel 0 (SAS transport) and channel 1 (generic SCSI) when SAS transport is enabled, causing user confusion and management issues. **Stable kernel criteria assessment**: - ✅ **Obviously correct**: Simple conditional checks with clear logic - ✅ **Fixes a real bug**: Duplicate device enumeration is a real user- visible issue - ✅ **Small and contained**: Only 4 lines of actual code change - ✅ **No new features**: Just corrects existing device enumeration logic - ✅ **Tested**: Merged through maintainer tree with proper sign-offs - ✅ **Intentional stable submission**: Link to stable mailing list present **Risk vs Benefit**: - **Risk**: Very low - simple conditional check, worst case is device visibility issue - **Benefit**: Fixes confusing duplicate device entries for MPI3MR users with SAS transport **Concerns**: 1. Requires commit c4723e68a0d81 to be present (6.1.y and later only) 2. Version bump in header should be stripped for stable backport The explicit submission to the stable mailing list, the small surgical nature of the fix, and the clear bug it addresses make this a valid stable backport candidate for kernels 6.1.y and newer. **YES** drivers/scsi/mpi3mr/mpi3mr.h | 4 ++-- drivers/scsi/mpi3mr/mpi3mr_os.c | 4 +++- 2 files changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/mpi3mr/mpi3mr.h b/drivers/scsi/mpi3mr/mpi3mr.h index 6742684e2990a..31d68c151b207 100644 --- a/drivers/scsi/mpi3mr/mpi3mr.h +++ b/drivers/scsi/mpi3mr/mpi3mr.h @@ -56,8 +56,8 @@ extern struct list_head mrioc_list; extern int prot_mask; extern atomic64_t event_counter; -#define MPI3MR_DRIVER_VERSION "8.15.0.5.50" -#define MPI3MR_DRIVER_RELDATE "12-August-2025" +#define MPI3MR_DRIVER_VERSION "8.15.0.5.51" +#define MPI3MR_DRIVER_RELDATE "18-November-2025" #define MPI3MR_DRIVER_NAME "mpi3mr" #define MPI3MR_DRIVER_LICENSE "GPL" diff --git a/drivers/scsi/mpi3mr/mpi3mr_os.c b/drivers/scsi/mpi3mr/mpi3mr_os.c index b88633e1efe27..d4ca878d08869 100644 --- a/drivers/scsi/mpi3mr/mpi3mr_os.c +++ b/drivers/scsi/mpi3mr/mpi3mr_os.c @@ -1184,6 +1184,8 @@ static void mpi3mr_update_tgtdev(struct mpi3mr_ioc *mrioc, if (is_added == true) tgtdev->io_throttle_enabled = (flags & MPI3_DEVICE0_FLAGS_IO_THROTTLING_REQUIRED) ? 1 : 0; + if (!mrioc->sas_transport_enabled) + tgtdev->non_stl = 1; switch (flags & MPI3_DEVICE0_FLAGS_MAX_WRITE_SAME_MASK) { case MPI3_DEVICE0_FLAGS_MAX_WRITE_SAME_256_LB: @@ -4844,7 +4846,7 @@ static int mpi3mr_target_alloc(struct scsi_target *starget) spin_lock_irqsave(&mrioc->tgtdev_lock, flags); if (starget->channel == mrioc->scsi_device_channel) { tgt_dev = __mpi3mr_get_tgtdev_by_perst_id(mrioc, starget->id); - if (tgt_dev && !tgt_dev->is_hidden) { + if (tgt_dev && !tgt_dev->is_hidden && tgt_dev->non_stl) { scsi_tgt_priv_data->starget = starget; scsi_tgt_priv_data->dev_handle = tgt_dev->dev_handle; scsi_tgt_priv_data->perst_id = tgt_dev->perst_id; -- 2.51.0

6 days, 2 hours

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[PATCH 6.6.y 0/2] Backport for CVE-2025-22121

by David Nyström

Signed-off-by: David Nyström <david.nystrom(a)est.tech> --- Ye Bin (2): ext4: introduce ITAIL helper ext4: fix out-of-bound read in ext4_xattr_inode_dec_ref_all() fs/ext4/inode.c | 5 +++++ fs/ext4/xattr.c | 32 ++++---------------------------- fs/ext4/xattr.h | 10 ++++++++++ 3 files changed, 19 insertions(+), 28 deletions(-) --- base-commit: 4791134e4aebe300af2b409dc550610ef69fae3e change-id: 20251212-cve-2025-22121-c30057f1bbcb Best regards, -- David Nyström <david.nystrom(a)est.tech>

6 days, 2 hours

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[PATCH] cpufreq: pmac64-cpufreq: Fix refcount leak on error paths

by Miaoqian Lin

of_cpu_device_node_get obtain a reference to the device node which must be released with of_node_put(). Add missing of_node_put() on error paths to fix. Found via static analysis and code review. Fixes: 760287ab90a3 ("cpufreq: pmac64-cpufreq: remove device tree parsing for cpu nodes") Fixes: 4350147a816b ("[PATCH] ppc64: SMU based macs cpufreq support") Cc: stable(a)vger.kernel.org Signed-off-by: Miaoqian Lin <linmq006(a)gmail.com> --- drivers/cpufreq/pmac64-cpufreq.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/cpufreq/pmac64-cpufreq.c b/drivers/cpufreq/pmac64-cpufreq.c index 80897ec8f00e..0e0205b888ba 100644 --- a/drivers/cpufreq/pmac64-cpufreq.c +++ b/drivers/cpufreq/pmac64-cpufreq.c @@ -356,8 +356,10 @@ static int __init g5_neo2_cpufreq_init(struct device_node *cpunode) use_volts_smu = 1; else if (of_machine_is_compatible("PowerMac11,2")) use_volts_vdnap = 1; - else - return -ENODEV; + else { + rc = -ENODEV; + goto bail_noprops; + } /* Check 970FX for now */ valp = of_get_property(cpunode, "cpu-version", NULL); @@ -430,8 +432,11 @@ static int __init g5_neo2_cpufreq_init(struct device_node *cpunode) * supporting anything else. */ valp = of_get_property(cpunode, "clock-frequency", NULL); - if (!valp) - return -ENODEV; + if (!valp) { + rc = -ENODEV; + goto bail_noprops; + } + max_freq = (*valp)/1000; g5_cpu_freqs[0].frequency = max_freq; g5_cpu_freqs[1].frequency = max_freq/2; -- 2.25.1

6 days, 5 hours

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[PATCH v2 RESEND] coresight: etm-perf: Fix reference count leak in etm_setup_aux

by Ma Ke

In etm_setup_aux(), when a user sink is obtained via coresight_get_sink_by_id(), it increments the reference count of the sink device. However, if the sink is used in path building, the path holds a reference, but the initial reference from coresight_get_sink_by_id() is not released, causing a reference count leak. We should release the initial reference after the path is built. Found by code review. Cc: stable(a)vger.kernel.org Fixes: 0e6c20517596 ("coresight: etm-perf: Allow an event to use different sinks") Signed-off-by: Ma Ke <make24(a)iscas.ac.cn> --- Changes in v2: - modified the patch as suggestions. --- drivers/hwtracing/coresight/coresight-etm-perf.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c index 17afa0f4cdee..56d012ab6d3a 100644 --- a/drivers/hwtracing/coresight/coresight-etm-perf.c +++ b/drivers/hwtracing/coresight/coresight-etm-perf.c @@ -454,6 +454,11 @@ static void *etm_setup_aux(struct perf_event *event, void **pages, goto err; out: + if (user_sink) { + put_device(&user_sink->dev); + user_sink = NULL; + } + return event_data; err: -- 2.17.1

6 days, 8 hours

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[PATCH v2] USB: Fix error handling in gadget driver

by Ma Ke

lpc32xx_udc_probe() acquires an i2c_client reference through isp1301_get_client() but fails to release it in both error handling paths and the normal removal path. This could result in a reference count leak for the I2C device, preventing proper cleanup and potentially leading to resource exhaustion. Add put_device() to release the reference in the probe failure path and in the remove function. Calling path: isp1301_get_client() -> of_find_i2c_device_by_node() -> i2c_find_device_by_fwnode(). As comments of i2c_find_device_by_fwnode() says, 'The user must call put_device(&client->dev) once done with the i2c client.' Found by code review. Cc: stable(a)vger.kernel.org Fixes: 24a28e428351 ("USB: gadget driver for LPC32xx") Signed-off-by: Ma Ke <make24(a)iscas.ac.cn> --- Changes in v2: - simplified the patch as suggestions. --- drivers/usb/gadget/udc/lpc32xx_udc.c | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-) diff --git a/drivers/usb/gadget/udc/lpc32xx_udc.c b/drivers/usb/gadget/udc/lpc32xx_udc.c index 1a7d3c4f652f..73c0f28a8585 100644 --- a/drivers/usb/gadget/udc/lpc32xx_udc.c +++ b/drivers/usb/gadget/udc/lpc32xx_udc.c @@ -3020,7 +3020,7 @@ static int lpc32xx_udc_probe(struct platform_device *pdev) pdev->dev.dma_mask = &lpc32xx_usbd_dmamask; retval = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32)); if (retval) - return retval; + goto i2c_fail; udc->board = &lpc32xx_usbddata; @@ -3038,28 +3038,32 @@ static int lpc32xx_udc_probe(struct platform_device *pdev) /* Get IRQs */ for (i = 0; i < 4; i++) { udc->udp_irq[i] = platform_get_irq(pdev, i); - if (udc->udp_irq[i] < 0) - return udc->udp_irq[i]; + if (udc->udp_irq[i] < 0) { + retval = udc->udp_irq[i]; + goto i2c_fail; + } } udc->udp_baseaddr = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(udc->udp_baseaddr)) { dev_err(udc->dev, "IO map failure\n"); - return PTR_ERR(udc->udp_baseaddr); + retval = PTR_ERR(udc->udp_baseaddr); + goto i2c_fail; } /* Get USB device clock */ udc->usb_slv_clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(udc->usb_slv_clk)) { dev_err(udc->dev, "failed to acquire USB device clock\n"); - return PTR_ERR(udc->usb_slv_clk); + retval = PTR_ERR(udc->usb_slv_clk); + goto i2c_fail; } /* Enable USB device clock */ retval = clk_prepare_enable(udc->usb_slv_clk); if (retval < 0) { dev_err(udc->dev, "failed to start USB device clock\n"); - return retval; + goto i2c_fail; } /* Setup deferred workqueue data */ @@ -3161,6 +3165,8 @@ static int lpc32xx_udc_probe(struct platform_device *pdev) dma_free_coherent(&pdev->dev, UDCA_BUFF_SIZE, udc->udca_v_base, udc->udca_p_base); i2c_fail: + if (udc->isp1301_i2c_client) + put_device(&udc->isp1301_i2c_client->dev); clk_disable_unprepare(udc->usb_slv_clk); dev_err(udc->dev, "%s probe failed, %d\n", driver_name, retval); @@ -3189,6 +3195,9 @@ static void lpc32xx_udc_remove(struct platform_device *pdev) dma_free_coherent(&pdev->dev, UDCA_BUFF_SIZE, udc->udca_v_base, udc->udca_p_base); + if (udc->isp1301_i2c_client) + put_device(&udc->isp1301_i2c_client->dev); + clk_disable_unprepare(udc->usb_slv_clk); } -- 2.17.1

6 days, 8 hours

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[PATCH] rpmsg: core: fix race in driver_override_show() and use core helper

by Gui-Dong Han

The driver_override_show function reads the driver_override string without holding the device_lock. However, the store function modifies and frees the string while holding the device_lock. This creates a race condition where the string can be freed by the store function while being read by the show function, leading to a use-after-free. To fix this, replace the rpmsg_string_attr macro with explicit show and store functions. The new driver_override_store uses the standard driver_set_override helper. Since the introduction of driver_set_override, the comments in include/linux/rpmsg.h have stated that this helper must be used to set or clear driver_override, but the implementation was not updated until now. Because driver_set_override modifies and frees the string while holding the device_lock, the new driver_override_show now correctly holds the device_lock during the read operation to prevent the race. Additionally, since rpmsg_string_attr has only ever been used for driver_override, removing the macro simplifies the code. Fixes: 39e47767ec9b ("rpmsg: Add driver_override device attribute for rpmsg_device") Cc: stable(a)vger.kernel.org Signed-off-by: Gui-Dong Han <hanguidong02(a)gmail.com> --- I verified this with a stress test that continuously writes/reads the attribute. It triggered KASAN and leaked bytes like a0 f4 81 9f a3 ff ff (likely kernel pointers). Since driver_override is world-readable (0644), this allows unprivileged users to leak kernel pointers and bypass KASLR. Similar races were fixed in other buses (e.g., commits 9561475db680 and 91d44c1afc61). Currently, 9 of 11 buses handle this correctly; this patch fixes one of the remaining two. --- drivers/rpmsg/rpmsg_core.c | 66 ++++++++++++++++---------------------- 1 file changed, 27 insertions(+), 39 deletions(-) diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c index 5d661681a9b6..96964745065b 100644 --- a/drivers/rpmsg/rpmsg_core.c +++ b/drivers/rpmsg/rpmsg_core.c @@ -352,50 +352,38 @@ field##_show(struct device *dev, \ } \ static DEVICE_ATTR_RO(field); -#define rpmsg_string_attr(field, member) \ -static ssize_t \ -field##_store(struct device *dev, struct device_attribute *attr, \ - const char *buf, size_t sz) \ -{ \ - struct rpmsg_device *rpdev = to_rpmsg_device(dev); \ - const char *old; \ - char *new; \ - \ - new = kstrndup(buf, sz, GFP_KERNEL); \ - if (!new) \ - return -ENOMEM; \ - new[strcspn(new, "\n")] = '\0'; \ - \ - device_lock(dev); \ - old = rpdev->member; \ - if (strlen(new)) { \ - rpdev->member = new; \ - } else { \ - kfree(new); \ - rpdev->member = NULL; \ - } \ - device_unlock(dev); \ - \ - kfree(old); \ - \ - return sz; \ -} \ -static ssize_t \ -field##_show(struct device *dev, \ - struct device_attribute *attr, char *buf) \ -{ \ - struct rpmsg_device *rpdev = to_rpmsg_device(dev); \ - \ - return sprintf(buf, "%s\n", rpdev->member); \ -} \ -static DEVICE_ATTR_RW(field) - /* for more info, see Documentation/ABI/testing/sysfs-bus-rpmsg */ rpmsg_show_attr(name, id.name, "%s\n"); rpmsg_show_attr(src, src, "0x%x\n"); rpmsg_show_attr(dst, dst, "0x%x\n"); rpmsg_show_attr(announce, announce ? "true" : "false", "%s\n"); -rpmsg_string_attr(driver_override, driver_override); + +static ssize_t driver_override_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct rpmsg_device *rpdev = to_rpmsg_device(dev); + int ret; + + ret = driver_set_override(dev, &rpdev->driver_override, buf, count); + if (ret) + return ret; + + return count; +} + +static ssize_t driver_override_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct rpmsg_device *rpdev = to_rpmsg_device(dev); + ssize_t len; + + device_lock(dev); + len = sysfs_emit(buf, "%s\n", rpdev->driver_override); + device_unlock(dev); + return len; +} +static DEVICE_ATTR_RW(driver_override); static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf) -- 2.43.0

6 days, 9 hours

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Re: Patch "RAS: Report all ARM processor CPER information to userspace" has been added to the 6.18-stable tree

by Mauro Carvalho Chehab

Hi Sacha, Em Sat, 13 Dec 2025 04:49:42 -0500 Sasha Levin <sashal(a)kernel.org> escreveu: > This is a note to let you know that I've just added the patch titled > > RAS: Report all ARM processor CPER information to userspace > > to the 6.18-stable tree which can be found at: > http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… > > The filename of the patch is: > ras-report-all-arm-processor-cper-information-to-use.patch > and it can be found in the queue-6.18 subdirectory. > > If you, or anyone else, feels it should not be added to the stable tree, > please let <stable(a)vger.kernel.org> know about it. You should also backport this patch(*): 96b010536ee0 efi/cper: align ARM CPER type with UEFI 2.9A/2.10 specs It fixes a bug at the UEFI parser for the ARM Processor Error record: basically, the specs were not clear about how the error type should be reported. The Kernel implementation were assuming that this was an enum, but UEFI errata 2.9A make it clear that the value is a bitmap. So, basically, all kernels up to 6.18 are not parsing the field the expected way: only "Cache error" was properly reported. The other 3 types were wrong. (*) You could need to backport those patches as well: a976d790f494 efi/cper: Add a new helper function to print bitmasks 8ad2c72e21ef efi/cper: Adjust infopfx size to accept an extra space Regards, Mauro Thanks, Mauro

6 days, 9 hours

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Re: Patch "block: fix cached zone reports on devices with native zone append" has been added to the 6.18-stable tree

by Damien Le Moal

On 12/15/25 09:37, Sasha Levin wrote: > This is a note to let you know that I've just added the patch titled > > block: fix cached zone reports on devices with native zone append > > to the 6.18-stable tree which can be found at: > http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… > > The filename of the patch is: > block-fix-cached-zone-reports-on-devices-with-native.patch > and it can be found in the queue-6.18 subdirectory. > > If you, or anyone else, feels it should not be added to the stable tree, > please let <stable(a)vger.kernel.org> know about it. Sasha, This is a fix for a new feature that was queued for and is now added to 6.19. So backporting this to stable and LTS kernels is not advisable. -- Damien Le Moal Western Digital Research

6 days, 9 hours

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Re: Patch "block: mq-deadline: Remove support for zone write locking" has been added to the 6.6-stable tree

by Damien Le Moal

On 12/13/25 20:09, Sasha Levin wrote: > This is a note to let you know that I've just added the patch titled > > block: mq-deadline: Remove support for zone write locking > > to the 6.6-stable tree which can be found at: > http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… > > The filename of the patch is: > block-mq-deadline-remove-support-for-zone-write-lock.patch > and it can be found in the queue-6.6 subdirectory. > > If you, or anyone else, feels it should not be added to the stable tree, > please let <stable(a)vger.kernel.org> know about it. Sasha, Zone write locking in the mq-deadline scheduler was replaced with the generic zone write plugging in the block layer in 6.10. That was not backported as that is a new feature. So removing zone write locking in 6.6 will break support for SMR drives and other zoned block devices. Removing it from 6.6 is thus not OK. Please undo this. > commit bf2022eaa2291ad1243b0711d5bd03ba4105ffbb > Author: Damien Le Moal <dlemoal(a)kernel.org> > Date: Mon Apr 8 10:41:21 2024 +0900 > > block: mq-deadline: Remove support for zone write locking > > [ Upstream commit fde02699c242e88a71286677d27cc890a959b67f ] > > With the block layer generic plugging of write operations for zoned > block devices, mq-deadline, or any other scheduler, can only ever > see at most one write operation per zone at any time. There is thus no > sequentiality requirements for these writes and thus no need to tightly > control the dispatching of write requests using zone write locking. > > Remove all the code that implement this control in the mq-deadline > scheduler and remove advertizing support for the > ELEVATOR_F_ZBD_SEQ_WRITE elevator feature. > > Signed-off-by: Damien Le Moal <dlemoal(a)kernel.org> > Reviewed-by: Hannes Reinecke <hare(a)suse.de> > Reviewed-by: Christoph Hellwig <hch(a)lst.de> > Reviewed-by: Bart Van Assche <bvanassche(a)acm.org> > Tested-by: Hans Holmberg <hans.holmberg(a)wdc.com> > Tested-by: Dennis Maisenbacher <dennis.maisenbacher(a)wdc.com> > Reviewed-by: Martin K. Petersen <martin.petersen(a)oracle.com> > Link: https://lore.kernel.org/r/20240408014128.205141-22-dlemoal@kernel.org > Signed-off-by: Jens Axboe <axboe(a)kernel.dk> > Stable-dep-of: d60055cf5270 ("block/mq-deadline: Switch back to a single dispatch list") > Signed-off-by: Sasha Levin <sashal(a)kernel.org> > > diff --git a/block/mq-deadline.c b/block/mq-deadline.c > index 78a8aa204c156..23638b03d7b3d 100644 > --- a/block/mq-deadline.c > +++ b/block/mq-deadline.c > @@ -102,7 +102,6 @@ struct deadline_data { > int prio_aging_expire; > > spinlock_t lock; > - spinlock_t zone_lock; > }; > > /* Maps an I/O priority class to a deadline scheduler priority. */ > @@ -157,8 +156,7 @@ deadline_latter_request(struct request *rq) > } > > /* > - * Return the first request for which blk_rq_pos() >= @pos. For zoned devices, > - * return the first request after the start of the zone containing @pos. > + * Return the first request for which blk_rq_pos() >= @pos. > */ > static inline struct request *deadline_from_pos(struct dd_per_prio *per_prio, > enum dd_data_dir data_dir, sector_t pos) > @@ -170,14 +168,6 @@ static inline struct request *deadline_from_pos(struct dd_per_prio *per_prio, > return NULL; > > rq = rb_entry_rq(node); > - /* > - * A zoned write may have been requeued with a starting position that > - * is below that of the most recently dispatched request. Hence, for > - * zoned writes, start searching from the start of a zone. > - */ > - if (blk_rq_is_seq_zoned_write(rq)) > - pos = round_down(pos, rq->q->limits.chunk_sectors); > - > while (node) { > rq = rb_entry_rq(node); > if (blk_rq_pos(rq) >= pos) { > @@ -308,36 +298,6 @@ static inline bool deadline_check_fifo(struct dd_per_prio *per_prio, > return time_is_before_eq_jiffies((unsigned long)rq->fifo_time); > } > > -/* > - * Check if rq has a sequential request preceding it. > - */ > -static bool deadline_is_seq_write(struct deadline_data *dd, struct request *rq) > -{ > - struct request *prev = deadline_earlier_request(rq); > - > - if (!prev) > - return false; > - > - return blk_rq_pos(prev) + blk_rq_sectors(prev) == blk_rq_pos(rq); > -} > - > -/* > - * Skip all write requests that are sequential from @rq, even if we cross > - * a zone boundary. > - */ > -static struct request *deadline_skip_seq_writes(struct deadline_data *dd, > - struct request *rq) > -{ > - sector_t pos = blk_rq_pos(rq); > - > - do { > - pos += blk_rq_sectors(rq); > - rq = deadline_latter_request(rq); > - } while (rq && blk_rq_pos(rq) == pos); > - > - return rq; > -} > - > /* > * For the specified data direction, return the next request to > * dispatch using arrival ordered lists. > @@ -346,40 +306,10 @@ static struct request * > deadline_fifo_request(struct deadline_data *dd, struct dd_per_prio *per_prio, > enum dd_data_dir data_dir) > { > - struct request *rq, *rb_rq, *next; > - unsigned long flags; > - > if (list_empty(&per_prio->fifo_list[data_dir])) > return NULL; > > - rq = rq_entry_fifo(per_prio->fifo_list[data_dir].next); > - if (data_dir == DD_READ || !blk_queue_is_zoned(rq->q)) > - return rq; > - > - /* > - * Look for a write request that can be dispatched, that is one with > - * an unlocked target zone. For some HDDs, breaking a sequential > - * write stream can lead to lower throughput, so make sure to preserve > - * sequential write streams, even if that stream crosses into the next > - * zones and these zones are unlocked. > - */ > - spin_lock_irqsave(&dd->zone_lock, flags); > - list_for_each_entry_safe(rq, next, &per_prio->fifo_list[DD_WRITE], > - queuelist) { > - /* Check whether a prior request exists for the same zone. */ > - rb_rq = deadline_from_pos(per_prio, data_dir, blk_rq_pos(rq)); > - if (rb_rq && blk_rq_pos(rb_rq) < blk_rq_pos(rq)) > - rq = rb_rq; > - if (blk_req_can_dispatch_to_zone(rq) && > - (blk_queue_nonrot(rq->q) || > - !deadline_is_seq_write(dd, rq))) > - goto out; > - } > - rq = NULL; > -out: > - spin_unlock_irqrestore(&dd->zone_lock, flags); > - > - return rq; > + return rq_entry_fifo(per_prio->fifo_list[data_dir].next); > } > > /* > @@ -390,36 +320,8 @@ static struct request * > deadline_next_request(struct deadline_data *dd, struct dd_per_prio *per_prio, > enum dd_data_dir data_dir) > { > - struct request *rq; > - unsigned long flags; > - > - rq = deadline_from_pos(per_prio, data_dir, > - per_prio->latest_pos[data_dir]); > - if (!rq) > - return NULL; > - > - if (data_dir == DD_READ || !blk_queue_is_zoned(rq->q)) > - return rq; > - > - /* > - * Look for a write request that can be dispatched, that is one with > - * an unlocked target zone. For some HDDs, breaking a sequential > - * write stream can lead to lower throughput, so make sure to preserve > - * sequential write streams, even if that stream crosses into the next > - * zones and these zones are unlocked. > - */ > - spin_lock_irqsave(&dd->zone_lock, flags); > - while (rq) { > - if (blk_req_can_dispatch_to_zone(rq)) > - break; > - if (blk_queue_nonrot(rq->q)) > - rq = deadline_latter_request(rq); > - else > - rq = deadline_skip_seq_writes(dd, rq); > - } > - spin_unlock_irqrestore(&dd->zone_lock, flags); > - > - return rq; > + return deadline_from_pos(per_prio, data_dir, > + per_prio->latest_pos[data_dir]); > } > > /* > @@ -525,10 +427,6 @@ static struct request *__dd_dispatch_request(struct deadline_data *dd, > rq = next_rq; > } > > - /* > - * For a zoned block device, if we only have writes queued and none of > - * them can be dispatched, rq will be NULL. > - */ > if (!rq) > return NULL; > > @@ -549,10 +447,6 @@ static struct request *__dd_dispatch_request(struct deadline_data *dd, > prio = ioprio_class_to_prio[ioprio_class]; > dd->per_prio[prio].latest_pos[data_dir] = blk_rq_pos(rq); > dd->per_prio[prio].stats.dispatched++; > - /* > - * If the request needs its target zone locked, do it. > - */ > - blk_req_zone_write_lock(rq); > rq->rq_flags |= RQF_STARTED; > return rq; > } > @@ -736,7 +630,6 @@ static int dd_init_sched(struct request_queue *q, struct elevator_type *e) > dd->fifo_batch = fifo_batch; > dd->prio_aging_expire = prio_aging_expire; > spin_lock_init(&dd->lock); > - spin_lock_init(&dd->zone_lock); > > /* We dispatch from request queue wide instead of hw queue */ > blk_queue_flag_set(QUEUE_FLAG_SQ_SCHED, q); > @@ -818,12 +711,6 @@ static void dd_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq, > > lockdep_assert_held(&dd->lock); > > - /* > - * This may be a requeue of a write request that has locked its > - * target zone. If it is the case, this releases the zone lock. > - */ > - blk_req_zone_write_unlock(rq); > - > prio = ioprio_class_to_prio[ioprio_class]; > per_prio = &dd->per_prio[prio]; > if (!rq->elv.priv[0]) { > @@ -855,18 +742,6 @@ static void dd_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq, > */ > rq->fifo_time = jiffies + dd->fifo_expire[data_dir]; > insert_before = &per_prio->fifo_list[data_dir]; > -#ifdef CONFIG_BLK_DEV_ZONED > - /* > - * Insert zoned writes such that requests are sorted by > - * position per zone. > - */ > - if (blk_rq_is_seq_zoned_write(rq)) { > - struct request *rq2 = deadline_latter_request(rq); > - > - if (rq2 && blk_rq_zone_no(rq2) == blk_rq_zone_no(rq)) > - insert_before = &rq2->queuelist; > - } > -#endif > list_add_tail(&rq->queuelist, insert_before); > } > } > @@ -901,33 +776,8 @@ static void dd_prepare_request(struct request *rq) > rq->elv.priv[0] = NULL; > } > > -static bool dd_has_write_work(struct blk_mq_hw_ctx *hctx) > -{ > - struct deadline_data *dd = hctx->queue->elevator->elevator_data; > - enum dd_prio p; > - > - for (p = 0; p <= DD_PRIO_MAX; p++) > - if (!list_empty_careful(&dd->per_prio[p].fifo_list[DD_WRITE])) > - return true; > - > - return false; > -} > - > /* > * Callback from inside blk_mq_free_request(). > - * > - * For zoned block devices, write unlock the target zone of > - * completed write requests. Do this while holding the zone lock > - * spinlock so that the zone is never unlocked while deadline_fifo_request() > - * or deadline_next_request() are executing. This function is called for > - * all requests, whether or not these requests complete successfully. > - * > - * For a zoned block device, __dd_dispatch_request() may have stopped > - * dispatching requests if all the queued requests are write requests directed > - * at zones that are already locked due to on-going write requests. To ensure > - * write request dispatch progress in this case, mark the queue as needing a > - * restart to ensure that the queue is run again after completion of the > - * request and zones being unlocked. > */ > static void dd_finish_request(struct request *rq) > { > @@ -942,21 +792,8 @@ static void dd_finish_request(struct request *rq) > * called dd_insert_requests(). Skip requests that bypassed I/O > * scheduling. See also blk_mq_request_bypass_insert(). > */ > - if (!rq->elv.priv[0]) > - return; > - > - atomic_inc(&per_prio->stats.completed); > - > - if (blk_queue_is_zoned(q)) { > - unsigned long flags; > - > - spin_lock_irqsave(&dd->zone_lock, flags); > - blk_req_zone_write_unlock(rq); > - spin_unlock_irqrestore(&dd->zone_lock, flags); > - > - if (dd_has_write_work(rq->mq_hctx)) > - blk_mq_sched_mark_restart_hctx(rq->mq_hctx); > - } > + if (rq->elv.priv[0]) > + atomic_inc(&per_prio->stats.completed); > } > > static bool dd_has_work_for_prio(struct dd_per_prio *per_prio) > @@ -1280,7 +1117,6 @@ static struct elevator_type mq_deadline = { > .elevator_attrs = deadline_attrs, > .elevator_name = "mq-deadline", > .elevator_alias = "deadline", > - .elevator_features = ELEVATOR_F_ZBD_SEQ_WRITE, > .elevator_owner = THIS_MODULE, > }; > MODULE_ALIAS("mq-deadline-iosched"); -- Damien Le Moal Western Digital Research

6 days, 9 hours

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PROBLEM: hwclock busted w/ M48T59 RTC (regression)

by Nick Bowler

Hi, After a stable kernel update, the hwclock command seems no longer functional on my SPARC system with an ST M48T59Y-70PC1 RTC: # hwclock [...long delay...] hwclock: select() to /dev/rtc0 to wait for clock tick timed out On prior kernels, there is no problem: # hwclock 2025-10-22 22:21:04.806992-04:00 I reproduced the same failure on 6.18-rc2 and bisected to this commit: commit 795cda8338eab036013314dbc0b04aae728880ab Author: Esben Haabendal <esben(a)geanix.com> Date: Fri May 16 09:23:35 2025 +0200 rtc: interface: Fix long-standing race when setting alarm This commit was backported to all current 6.x stable branches, as well as 5.15.x, so they all have the same regression. Reverting this commit on top of 6.18-rc2 corrects the problem. Let me know if you need any more info! Thanks, Nick

6 days, 12 hours

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