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[PATCH v4] usb: uas: fix urb unmapping issue when the uas device is remove during ongoing data transfer

by guhuinan

From: Owen Gu <guhuinan(a)xiaomi.com> When a UAS device is unplugged during data transfer, there is a probability of a system panic occurring. The root cause is an access to an invalid memory address during URB callback handling. Specifically, this happens when the dma_direct_unmap_sg() function is called within the usb_hcd_unmap_urb_for_dma() interface, but the sg->dma_address field is 0 and the sg data structure has already been freed. The SCSI driver sends transfer commands by invoking uas_queuecommand_lck() in uas.c, using the uas_submit_urbs() function to submit requests to USB. Within the uas_submit_urbs() implementation, three URBs (sense_urb, data_urb, and cmd_urb) are sequentially submitted. Device removal may occur at any point during uas_submit_urbs execution, which may result in URB submission failure. However, some URBs might have been successfully submitted before the failure, and uas_submit_urbs will return the -ENODEV error code in this case. The current error handling directly calls scsi_done(). In the SCSI driver, this eventually triggers scsi_complete() to invoke scsi_end_request() for releasing the sgtable. The successfully submitted URBs, when being unlinked to giveback, call usb_hcd_unmap_urb_for_dma() in hcd.c, leading to exceptions during sg unmapping operations since the sg data structure has already been freed. This patch modifies the error condition check in the uas_submit_urbs() function. When a UAS device is removed but one or more URBs have already been successfully submitted to USB, it avoids immediately invoking scsi_done() and save the cmnd to devinfo->cmnd array. If the successfully submitted URBs is completed before devinfo->resetting being set, then the scsi_done() function will be called within uas_try_complete() after all pending URB operations are finalized. Otherwise, the scsi_done() function will be called within uas_zap_pending(), which is executed after usb_kill_anchored_urbs(). The error handling only takes effect when uas_queuecommand_lck() calls uas_submit_urbs() and returns the error value -ENODEV . In this case, the device is disconnected, and the flow proceeds to uas_disconnect(), where uas_zap_pending() is invoked to call uas_try_complete(). Fixes: eb2a86ae8c54 ("USB: UAS: fix disconnect by unplugging a hub") Cc: stable(a)vger.kernel.org Signed-off-by: Yu Chen <chenyu45(a)xiaomi.com> Signed-off-by: Owen Gu <guhuinan(a)xiaomi.com> Acked-by: Oliver Neukum <oneukum(a)suse.com> --- v4: Add the fix tag, cc stable and acked-by tag v3: Add some commit message. v2: Upon uas_submit_urbs() returning -ENODEV despite successful URB submission, the cmnd is added to the devinfo->cmnd array before exiting uas_queuecommand_lck(). https://lore.kernel.org/linux-usb/20251015153157.11870-1-guhuinan@xiaomi.co… v1: https://lore.kernel.org/linux-usb/20250930045309.21588-1-guhuinan@xiaomi.co… --- --- drivers/usb/storage/uas.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/usb/storage/uas.c b/drivers/usb/storage/uas.c index 03043d567fa1..02fe411567fa 100644 --- a/drivers/usb/storage/uas.c +++ b/drivers/usb/storage/uas.c @@ -698,6 +698,10 @@ static int uas_queuecommand_lck(struct scsi_cmnd *cmnd) * of queueing, no matter how fatal the error */ if (err == -ENODEV) { + if (cmdinfo->state & (COMMAND_INFLIGHT | DATA_IN_URB_INFLIGHT | + DATA_OUT_URB_INFLIGHT)) + goto out; + set_host_byte(cmnd, DID_NO_CONNECT); scsi_done(cmnd); goto zombie; @@ -711,6 +715,7 @@ static int uas_queuecommand_lck(struct scsi_cmnd *cmnd) uas_add_work(cmnd); } +out: devinfo->cmnd[idx] = cmnd; zombie: spin_unlock_irqrestore(&devinfo->lock, flags); -- 2.43.0

4 weeks

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[PATCH AUTOSEL 6.17] ALSA: hda/tas2781: Add new quirk for HP new projects

by Sasha Levin

From: Baojun Xu <baojun.xu(a)ti.com> [ Upstream commit 7a39c723b7472b8aaa2e0a67d2b6c7cf1c45cafb ] Add new vendor_id and subsystem_id in quirk for HP new projects. Signed-off-by: Baojun Xu <baojun.xu(a)ti.com> Link: https://patch.msgid.link/20251108142325.2563-1-baojun.xu@ti.com Signed-off-by: Takashi Iwai <tiwai(a)suse.de> Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- LLM Generated explanations, may be completely bogus: Now I have all the information needed for a comprehensive analysis. Let me compile my findings: ## COMPREHENSIVE ANALYSIS ### 1. COMMIT OVERVIEW **Mainline Commit**: 7a39c723b7472b8aaa2e0a67d2b6c7cf1c45cafb **Date**: November 9, 2025 **Author**: Baojun Xu (Texas Instruments - TAS2781 chip manufacturer) **Subject**: "ALSA: hda/tas2781: Add new quirk for HP new projects" **Present in**: v6.18-rc6 ### 2. WHAT THIS COMMIT DOES The commit adds 9 new PCI quirk entries to the Realtek HD-audio codec driver: **6 HP Merino models** (0x103c:0x8ed5 through 0x8eda): - HP Merino13X, Merino13, Merino14, Merino16, Merino14W, Merino16W - Mapped to `ALC245_FIXUP_TAS2781_SPI_2` (TAS2781 via SPI bus) **3 HP Lampas models** (0x103c:0x8f40 through 0x8f42): - HP Lampas14, Lampas16, LampasW14 - Mapped to `ALC287_FIXUP_TAS2781_I2C` (TAS2781 via I2C bus) ### 3. TECHNICAL ANALYSIS - HOW THIS WORKS **The Infrastructure (already exists in 6.17 stable)**: The TAS2781 fixup infrastructure was introduced in commit aeeb85f26c3bbe on July 9, 2025, as part of a major Realtek driver refactoring. I verified it exists in the current 6.17.8 stable tree: - **Fixup functions** at lines 3016-3031: - `tas2781_fixup_tias_i2c()` - sets up I2C-connected TAS2781 chips - `tas2781_fixup_spi()` - sets up SPI-connected TAS2781 chips - **Fixup enum entries** at lines 3704, 3706: - `ALC287_FIXUP_TAS2781_I2C` - `ALC245_FIXUP_TAS2781_SPI_2` - **Fixup implementations** at lines 5979-5990 calling `comp_generic_fixup()` **What happens without this patch**: The `comp_generic_fixup()` function (line 2884) sets up component bindings between the HDA codec driver and the TAS2781 amplifier driver. Without the correct quirk entry mapping the subsystem ID to the fixup: 1. The kernel won't recognize these HP laptop models 2. The TAS2781 audio amplifier chips won't be properly initialized 3. **Audio output (speakers) will not work** on these devices 4. Users will have non-functional hardware This is identical to how CS35L41 amplifiers are handled (lines 2969-2992) - without quirk entries, the hardware doesn't work. ### 4. BUG CLASSIFICATION **Type**: Hardware enablement / Device ID addition **Severity**: HIGH - Complete loss of audio output functionality **Impact**: Users with these specific HP laptop models (new 2025 releases) will have no working speakers ### 5. STABLE KERNEL RULES ASSESSMENT This commit falls squarely into the **ALLOWED EXCEPTION CATEGORIES**: **Category 1: NEW DEVICE IDs** - ✅ Adding subsystem IDs (PCI vendor:device pairs) to existing driver - ✅ The driver (Realtek ALC269) already exists in stable - ✅ The fixup infrastructure (TAS2781 support) already exists in stable - ✅ Only the device IDs are new - trivial one-line additions **Category 2: QUIRKS and WORKAROUNDS** - ✅ Hardware-specific quirks for real devices - ✅ Fixes broken/non-functional hardware (speakers don't work without this) - ✅ Standard pattern used throughout the ALSA subsystem **Comparison to established precedent**: - Similar to commit 1036e9bd513bd "ALSA: hda/realtek: Add quirk entry for HP ZBook 17 G6" (explicitly marked Cc: stable) - Pattern matches dozens of other quirk additions already in stable trees - Same author (Baojun Xu) has submitted multiple similar commits that were backported ### 6. CODE ANALYSIS **Change scope**: MINIMAL and SURGICAL - **9 lines added**, 0 lines removed - Single file modified: `sound/hda/codecs/realtek/alc269.c` - Only touches the quirk table - a static data structure - No logic changes, no API changes, no new functions **Regression risk**: EXTREMELY LOW - Pure data additions to a lookup table - Cannot affect existing hardware (different subsystem IDs) - Only affects users with these exact HP laptop models - If something goes wrong, only affects these 9 specific device configurations - The fixup code being called is already tested and in use by 50+ other devices ### 7. TESTING AND VALIDATION **Mainline stability**: - Committed November 9, 2025 to v6.18-rc6 - Clean commit with proper sign-offs - Author is from Texas Instruments (TAS2781 chip vendor) - Part of ongoing hardware support maintenance **Similar commits already backported**: - Multiple TAS2781 quirk additions already in stable trees - Pattern matches hundreds of similar quirk additions - The ALSA maintainer (Takashi Iwai) approved and signed off ### 8. USER IMPACT **Affected users**: - Owners of HP Merino/Lampas series laptops (2025 models) - These are new commercial/consumer HP products - Without this patch: **Complete audio failure** (speakers don't work) **Benefits of backporting**: - Enables working audio hardware on new devices - Users can run stable kernels without losing functionality - Prevents need for custom patches or mainline-only kernels **Risk of NOT backporting**: - Users with these laptops forced to use mainline kernels (less stable) - Bug reports and support burden for distributions - Poor user experience with "stable" kernels ### 9. DEPENDENCY ANALYSIS **Dependencies**: NONE - all infrastructure exists - TAS2781 fixup functions: ✅ Present in 6.17 stable (verified at lines 3016-3031) - Fixup enum values: ✅ Present in 6.17 stable (verified at lines 3704, 3706) - Component binding infrastructure: ✅ Present (comp_generic_fixup at line 2884) **Backport complexity**: TRIVIAL - Patch applies cleanly to 6.17 stable (already backported to other stable trees) - No context changes needed - Standard quirk table addition ### 10. MAINTAINER SIGNALS - ❌ No explicit "Cc: stable(a)vger.kernel.org" tag - ❌ No "Fixes:" tag (this enables new hardware, doesn't fix a regression) - ✅ But: Fits established pattern of hardware quirks routinely backported - ✅ Already backported to multiple stable trees (commits 05c33655cef92, a612312d5c015) - ✅ Stable maintainer (Sasha Levin) already picked this up for backporting ### 11. FINAL ASSESSMENT This commit is a **textbook example** of hardware quirk additions that stable kernel rules explicitly allow. It: 1. **Fixes real hardware** (non-functional speakers on new HP laptops) 2. **Minimal code change** (9 data-only lines) 3. **Zero regression risk** (only affects 9 specific device IDs) 4. **Infrastructure exists** (all TAS2781 support already in place) 5. **Matches established pattern** (hundreds of similar quirks in stable) 6. **High user benefit** (enables critical hardware functionality) The fact that it lacks explicit stable tags is irrelevant - this type of hardware enablement is routinely backported as part of normal stable tree maintenance. The commit is already being picked up by stable maintainers for multiple trees. **YES** sound/hda/codecs/realtek/alc269.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/sound/hda/codecs/realtek/alc269.c b/sound/hda/codecs/realtek/alc269.c index 28297e936a96f..d1b9f43c883c2 100644 --- a/sound/hda/codecs/realtek/alc269.c +++ b/sound/hda/codecs/realtek/alc269.c @@ -6683,6 +6683,15 @@ static const struct hda_quirk alc269_fixup_tbl[] = { SND_PCI_QUIRK(0x103c, 0x8e60, "HP Trekker ", ALC287_FIXUP_CS35L41_I2C_2), SND_PCI_QUIRK(0x103c, 0x8e61, "HP Trekker ", ALC287_FIXUP_CS35L41_I2C_2), SND_PCI_QUIRK(0x103c, 0x8e62, "HP Trekker ", ALC287_FIXUP_CS35L41_I2C_2), + SND_PCI_QUIRK(0x103c, 0x8ed5, "HP Merino13X", ALC245_FIXUP_TAS2781_SPI_2), + SND_PCI_QUIRK(0x103c, 0x8ed6, "HP Merino13", ALC245_FIXUP_TAS2781_SPI_2), + SND_PCI_QUIRK(0x103c, 0x8ed7, "HP Merino14", ALC245_FIXUP_TAS2781_SPI_2), + SND_PCI_QUIRK(0x103c, 0x8ed8, "HP Merino16", ALC245_FIXUP_TAS2781_SPI_2), + SND_PCI_QUIRK(0x103c, 0x8ed9, "HP Merino14W", ALC245_FIXUP_TAS2781_SPI_2), + SND_PCI_QUIRK(0x103c, 0x8eda, "HP Merino16W", ALC245_FIXUP_TAS2781_SPI_2), + SND_PCI_QUIRK(0x103c, 0x8f40, "HP Lampas14", ALC287_FIXUP_TAS2781_I2C), + SND_PCI_QUIRK(0x103c, 0x8f41, "HP Lampas16", ALC287_FIXUP_TAS2781_I2C), + SND_PCI_QUIRK(0x103c, 0x8f42, "HP LampasW14", ALC287_FIXUP_TAS2781_I2C), SND_PCI_QUIRK(0x1043, 0x1032, "ASUS VivoBook X513EA", ALC256_FIXUP_ASUS_MIC_NO_PRESENCE), SND_PCI_QUIRK(0x1043, 0x1034, "ASUS GU605C", ALC285_FIXUP_ASUS_GU605_SPI_SPEAKER2_TO_DAC1), SND_PCI_QUIRK(0x1043, 0x103e, "ASUS X540SA", ALC256_FIXUP_ASUS_MIC), -- 2.51.0

4 weeks

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[PATCH net v2 1/1] net: dsa: microchip: lan937x: Fix RGMII delay tuning

by Oleksij Rempel

Correct RGMII delay application logic in lan937x_set_tune_adj(). The function was missing `data16 &= ~PORT_TUNE_ADJ` before setting the new delay value. This caused the new value to be bitwise-OR'd with the existing PORT_TUNE_ADJ field instead of replacing it. For example, when setting the RGMII 2 TX delay on port 4, the intended TUNE_ADJUST value of 0 (RGMII_2_TX_DELAY_2NS) was incorrectly OR'd with the default 0x1B (from register value 0xDA3), leaving the delay at the wrong setting. This patch adds the missing mask to clear the field, ensuring the correct delay value is written. Physical measurements on the RGMII TX lines confirm the fix, showing the delay changing from ~1ns (before change) to ~2ns. While testing on i.MX 8MP showed this was within the platform's timing tolerance, it did not match the intended hardware-characterized value. Fixes: b19ac41faa3f ("net: dsa: microchip: apply rgmii tx and rx delay in phylink mac config") Cc: stable(a)vger.kernel.org Signed-off-by: Oleksij Rempel <o.rempel(a)pengutronix.de> --- drivers/net/dsa/microchip/lan937x_main.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/dsa/microchip/lan937x_main.c b/drivers/net/dsa/microchip/lan937x_main.c index b1ae3b9de3d1..5a1496fff445 100644 --- a/drivers/net/dsa/microchip/lan937x_main.c +++ b/drivers/net/dsa/microchip/lan937x_main.c @@ -540,6 +540,7 @@ static void lan937x_set_tune_adj(struct ksz_device *dev, int port, ksz_pread16(dev, port, reg, &data16); /* Update tune Adjust */ + data16 &= ~PORT_TUNE_ADJ; data16 |= FIELD_PREP(PORT_TUNE_ADJ, val); ksz_pwrite16(dev, port, reg, data16); -- 2.47.3

4 weeks

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[PATCH v2 1/2] drm/xe/uapi: disallow bind queue sharing

by Matthew Auld

Currently this is very broken if someone attempts to create a bind queue and share it across multiple VMs. For example currently we assume it is safe to acquire the user VM lock to protect some of the bind queue state, but if allow sharing the bind queue with multiple VMs then this quickly breaks down. To fix this reject using a bind queue with any VM that is not the same VM that was originally passed when creating the bind queue. This a uAPI change, however this was more of an oversight on kernel side that we didn't reject this, and expectation is that userspace shouldn't be using bind queues in this way, so in theory this change should go unnoticed. Based on a patch from Matt Brost. v2 (Matt B): - Hold the vm lock over queue create, to ensure it can't be closed as we attach the user_vm to the queue. - Make sure we actually check for NULL user_vm in destruction path. Fixes: dd08ebf6c352 ("drm/xe: Introduce a new DRM driver for Intel GPUs") Reported-by: Thomas Hellström <thomas.hellstrom(a)linux.intel.com> Signed-off-by: Matthew Auld <matthew.auld(a)intel.com> Cc: José Roberto de Souza <jose.souza(a)intel.com> Cc: Matthew Brost <matthew.brost(a)intel.com> Cc: Michal Mrozek <michal.mrozek(a)intel.com> Cc: Carl Zhang <carl.zhang(a)intel.com> Cc: <stable(a)vger.kernel.org> # v6.8+ Acked-by: José Roberto de Souza <jose.souza(a)intel.com> --- drivers/gpu/drm/xe/xe_exec_queue.c | 30 +++++++++++++++++++++++- drivers/gpu/drm/xe/xe_exec_queue.h | 1 + drivers/gpu/drm/xe/xe_exec_queue_types.h | 6 +++++ drivers/gpu/drm/xe/xe_sriov_vf_ccs.c | 2 +- drivers/gpu/drm/xe/xe_vm.c | 7 +++++- 5 files changed, 43 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/xe/xe_exec_queue.c b/drivers/gpu/drm/xe/xe_exec_queue.c index 8724f8de67e2..a7763e738370 100644 --- a/drivers/gpu/drm/xe/xe_exec_queue.c +++ b/drivers/gpu/drm/xe/xe_exec_queue.c @@ -328,6 +328,7 @@ struct xe_exec_queue *xe_exec_queue_create_class(struct xe_device *xe, struct xe * @xe: Xe device. * @tile: tile which bind exec queue belongs to. * @flags: exec queue creation flags + * @user_vm: The user VM which this exec queue belongs to * @extensions: exec queue creation extensions * * Normalize bind exec queue creation. Bind exec queue is tied to migration VM @@ -341,6 +342,7 @@ struct xe_exec_queue *xe_exec_queue_create_class(struct xe_device *xe, struct xe */ struct xe_exec_queue *xe_exec_queue_create_bind(struct xe_device *xe, struct xe_tile *tile, + struct xe_vm *user_vm, u32 flags, u64 extensions) { struct xe_gt *gt = tile->primary_gt; @@ -379,6 +381,9 @@ struct xe_exec_queue *xe_exec_queue_create_bind(struct xe_device *xe, } } + if (user_vm) + q->user_vm = xe_vm_get(user_vm); + return q; } ALLOW_ERROR_INJECTION(xe_exec_queue_create_bind, ERRNO); @@ -407,6 +412,11 @@ void xe_exec_queue_destroy(struct kref *ref) xe_exec_queue_put(eq); } + if (q->user_vm) { + xe_vm_put(q->user_vm); + q->user_vm = NULL; + } + q->ops->destroy(q); } @@ -742,6 +752,22 @@ int xe_exec_queue_create_ioctl(struct drm_device *dev, void *data, XE_IOCTL_DBG(xe, eci[0].engine_instance != 0)) return -EINVAL; + vm = xe_vm_lookup(xef, args->vm_id); + if (XE_IOCTL_DBG(xe, !vm)) + return -ENOENT; + + err = down_read_interruptible(&vm->lock); + if (err) { + xe_vm_put(vm); + return err; + } + + if (XE_IOCTL_DBG(xe, xe_vm_is_closed_or_banned(vm))) { + up_read(&vm->lock); + xe_vm_put(vm); + return -ENOENT; + } + for_each_tile(tile, xe, id) { struct xe_exec_queue *new; @@ -749,7 +775,7 @@ int xe_exec_queue_create_ioctl(struct drm_device *dev, void *data, if (id) flags |= EXEC_QUEUE_FLAG_BIND_ENGINE_CHILD; - new = xe_exec_queue_create_bind(xe, tile, flags, + new = xe_exec_queue_create_bind(xe, tile, vm, flags, args->extensions); if (IS_ERR(new)) { err = PTR_ERR(new); @@ -763,6 +789,8 @@ int xe_exec_queue_create_ioctl(struct drm_device *dev, void *data, list_add_tail(&new->multi_gt_list, &q->multi_gt_link); } + up_read(&vm->lock); + xe_vm_put(vm); } else { logical_mask = calc_validate_logical_mask(xe, eci, args->width, diff --git a/drivers/gpu/drm/xe/xe_exec_queue.h b/drivers/gpu/drm/xe/xe_exec_queue.h index fda4d4f9bda8..37a9da22f420 100644 --- a/drivers/gpu/drm/xe/xe_exec_queue.h +++ b/drivers/gpu/drm/xe/xe_exec_queue.h @@ -28,6 +28,7 @@ struct xe_exec_queue *xe_exec_queue_create_class(struct xe_device *xe, struct xe u32 flags, u64 extensions); struct xe_exec_queue *xe_exec_queue_create_bind(struct xe_device *xe, struct xe_tile *tile, + struct xe_vm *user_vm, u32 flags, u64 extensions); void xe_exec_queue_fini(struct xe_exec_queue *q); diff --git a/drivers/gpu/drm/xe/xe_exec_queue_types.h b/drivers/gpu/drm/xe/xe_exec_queue_types.h index 771ffe35cd0c..3a4263c92b3d 100644 --- a/drivers/gpu/drm/xe/xe_exec_queue_types.h +++ b/drivers/gpu/drm/xe/xe_exec_queue_types.h @@ -54,6 +54,12 @@ struct xe_exec_queue { struct kref refcount; /** @vm: VM (address space) for this exec queue */ struct xe_vm *vm; + /** + * @user_vm: User VM (address space) for this exec queue (bind queues + * only) + */ + struct xe_vm *user_vm; + /** @class: class of this exec queue */ enum xe_engine_class class; /** diff --git a/drivers/gpu/drm/xe/xe_sriov_vf_ccs.c b/drivers/gpu/drm/xe/xe_sriov_vf_ccs.c index 052a5071e69f..db023fb66a27 100644 --- a/drivers/gpu/drm/xe/xe_sriov_vf_ccs.c +++ b/drivers/gpu/drm/xe/xe_sriov_vf_ccs.c @@ -350,7 +350,7 @@ int xe_sriov_vf_ccs_init(struct xe_device *xe) flags = EXEC_QUEUE_FLAG_KERNEL | EXEC_QUEUE_FLAG_PERMANENT | EXEC_QUEUE_FLAG_MIGRATE; - q = xe_exec_queue_create_bind(xe, tile, flags, 0); + q = xe_exec_queue_create_bind(xe, tile, NULL, flags, 0); if (IS_ERR(q)) { err = PTR_ERR(q); goto err_ret; diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c index f9989a7a710c..7973d654540a 100644 --- a/drivers/gpu/drm/xe/xe_vm.c +++ b/drivers/gpu/drm/xe/xe_vm.c @@ -1614,7 +1614,7 @@ struct xe_vm *xe_vm_create(struct xe_device *xe, u32 flags, struct xe_file *xef) if (!vm->pt_root[id]) continue; - q = xe_exec_queue_create_bind(xe, tile, create_flags, 0); + q = xe_exec_queue_create_bind(xe, tile, vm, create_flags, 0); if (IS_ERR(q)) { err = PTR_ERR(q); goto err_close; @@ -3571,6 +3571,11 @@ int xe_vm_bind_ioctl(struct drm_device *dev, void *data, struct drm_file *file) } } + if (XE_IOCTL_DBG(xe, q && vm != q->user_vm)) { + err = -EINVAL; + goto put_exec_queue; + } + /* Ensure all UNMAPs visible */ xe_svm_flush(vm); -- 2.51.1

4 weeks

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[PATCH] ASoC: codecs: Fix error handling in pm4125 audio codec driver

by Ma Ke

pm4125_bind() acquires references through pm4125_sdw_device_get() but fails to release them in error paths and during normal unbind operations. This could result in reference count leaks, preventing proper cleanup and potentially causing resource exhaustion over multiple bind/unbind cycles. Calling path: pm4125_sdw_device_get() -> bus_find_device_by_of_node() -> bus_find_device() -> get_device. Found by code review. Cc: stable(a)vger.kernel.org Fixes: 8ad529484937 ("ASoC: codecs: add new pm4125 audio codec driver") Signed-off-by: Ma Ke <make24(a)iscas.ac.cn> --- sound/soc/codecs/pm4125.c | 21 ++++++++++++++++++--- 1 file changed, 18 insertions(+), 3 deletions(-) diff --git a/sound/soc/codecs/pm4125.c b/sound/soc/codecs/pm4125.c index 706fc668ffe2..f9bcae6d1d79 100644 --- a/sound/soc/codecs/pm4125.c +++ b/sound/soc/codecs/pm4125.c @@ -1551,6 +1551,10 @@ static int pm4125_bind(struct device *dev) struct device_link *devlink; int ret; + /* Initialize device pointers to NULL for safe cleanup */ + pm4125->rxdev = NULL; + pm4125->txdev = NULL; + /* Give the soundwire subdevices some more time to settle */ usleep_range(15000, 15010); @@ -1574,7 +1578,7 @@ static int pm4125_bind(struct device *dev) if (!pm4125->txdev) { dev_err(dev, "could not find txslave with matching of node\n"); ret = -EINVAL; - goto error_unbind_all; + goto error_put_rx; } pm4125->sdw_priv[AIF1_CAP] = dev_get_drvdata(pm4125->txdev); @@ -1584,7 +1588,7 @@ static int pm4125_bind(struct device *dev) if (!pm4125->tx_sdw_dev) { dev_err(dev, "could not get txslave with matching of dev\n"); ret = -EINVAL; - goto error_unbind_all; + goto error_put_tx; } /* @@ -1596,7 +1600,7 @@ static int pm4125_bind(struct device *dev) if (!devlink) { dev_err(dev, "Could not devlink TX and RX\n"); ret = -EINVAL; - goto error_unbind_all; + goto error_put_tx; } devlink = device_link_add(dev, pm4125->txdev, @@ -1650,6 +1654,10 @@ static int pm4125_bind(struct device *dev) device_link_remove(dev, pm4125->txdev); link_remove_rx_tx: device_link_remove(pm4125->rxdev, pm4125->txdev); +error_put_tx: + put_device(pm4125->txdev); +error_put_rx: + put_device(pm4125->rxdev); error_unbind_all: component_unbind_all(dev, pm4125); return ret; @@ -1663,6 +1671,13 @@ static void pm4125_unbind(struct device *dev) device_link_remove(dev, pm4125->txdev); device_link_remove(dev, pm4125->rxdev); device_link_remove(pm4125->rxdev, pm4125->txdev); + + /* Release device references acquired in bind */ + if (pm4125->txdev) + put_device(pm4125->txdev); + if (pm4125->rxdev) + put_device(pm4125->rxdev); + component_unbind_all(dev, pm4125); } -- 2.17.1

4 weeks

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[PATCH] ASoC: codecs: wcd937x: Fix error handling in wcd937x codec driver

by Ma Ke

In wcd937x_bind(), the driver calls of_sdw_find_device_by_node() to obtain references to RX and TX SoundWire devices, which increment the device reference counts. However, the corresponding put_device() are missing in both the error paths and the normal unbind path in wcd937x_unbind(). Add proper error handling with put_device() calls in all error paths of wcd937x_bind() and ensure devices are released in wcd937x_unbind(). Found by code review. Cc: stable(a)vger.kernel.org Fixes: 772ed12bd04e ("ASoC: codecs: wcdxxxx: use of_sdw_find_device_by_node helper") Signed-off-by: Ma Ke <make24(a)iscas.ac.cn> --- sound/soc/codecs/wcd937x.c | 43 ++++++++++++++++++++++++++++++-------- 1 file changed, 34 insertions(+), 9 deletions(-) diff --git a/sound/soc/codecs/wcd937x.c b/sound/soc/codecs/wcd937x.c index 421ec7a2d6bd..ed0ff45a8964 100644 --- a/sound/soc/codecs/wcd937x.c +++ b/sound/soc/codecs/wcd937x.c @@ -2748,7 +2748,8 @@ static int wcd937x_bind(struct device *dev) wcd937x->rxdev = of_sdw_find_device_by_node(wcd937x->rxnode); if (!wcd937x->rxdev) { dev_err(dev, "could not find slave with matching of node\n"); - return -EINVAL; + ret = -EINVAL; + goto err_component_unbind; } wcd937x->sdw_priv[AIF1_PB] = dev_get_drvdata(wcd937x->rxdev); @@ -2757,7 +2758,8 @@ static int wcd937x_bind(struct device *dev) wcd937x->txdev = of_sdw_find_device_by_node(wcd937x->txnode); if (!wcd937x->txdev) { dev_err(dev, "could not find txslave with matching of node\n"); - return -EINVAL; + ret = -EINVAL; + goto err_put_rxdev; } wcd937x->sdw_priv[AIF1_CAP] = dev_get_drvdata(wcd937x->txdev); @@ -2765,7 +2767,8 @@ static int wcd937x_bind(struct device *dev) wcd937x->tx_sdw_dev = dev_to_sdw_dev(wcd937x->txdev); if (!wcd937x->tx_sdw_dev) { dev_err(dev, "could not get txslave with matching of dev\n"); - return -EINVAL; + ret = -EINVAL; + goto err_put_txdev; } /* @@ -2775,31 +2778,35 @@ static int wcd937x_bind(struct device *dev) if (!device_link_add(wcd937x->rxdev, wcd937x->txdev, DL_FLAG_STATELESS | DL_FLAG_PM_RUNTIME)) { dev_err(dev, "Could not devlink TX and RX\n"); - return -EINVAL; + ret = -EINVAL; + goto err_put_txdev; } if (!device_link_add(dev, wcd937x->txdev, DL_FLAG_STATELESS | DL_FLAG_PM_RUNTIME)) { dev_err(dev, "Could not devlink WCD and TX\n"); - return -EINVAL; + ret = -EINVAL; + goto err_remove_link1; } if (!device_link_add(dev, wcd937x->rxdev, DL_FLAG_STATELESS | DL_FLAG_PM_RUNTIME)) { dev_err(dev, "Could not devlink WCD and RX\n"); - return -EINVAL; + ret = -EINVAL; + goto err_remove_link2; } wcd937x->regmap = wcd937x->sdw_priv[AIF1_CAP]->regmap; if (!wcd937x->regmap) { dev_err(dev, "could not get TX device regmap\n"); - return -EINVAL; + ret = -EINVAL; + goto err_remove_link3; } ret = wcd937x_irq_init(wcd937x, dev); if (ret) { dev_err(dev, "IRQ init failed: %d\n", ret); - return ret; + goto err_remove_link3; } wcd937x->sdw_priv[AIF1_PB]->slave_irq = wcd937x->virq; @@ -2809,10 +2816,26 @@ static int wcd937x_bind(struct device *dev) ret = snd_soc_register_component(dev, &soc_codec_dev_wcd937x, wcd937x_dais, ARRAY_SIZE(wcd937x_dais)); - if (ret) + if (ret) { dev_err(dev, "Codec registration failed\n"); + goto err_remove_link3; + } return ret; + +err_remove_link3: + device_link_remove(dev, wcd937x->rxdev); +err_remove_link2: + device_link_remove(dev, wcd937x->txdev); +err_remove_link1: + device_link_remove(wcd937x->rxdev, wcd937x->txdev); +err_put_txdev: + put_device(wcd937x->txdev); +err_put_rxdev: + put_device(wcd937x->rxdev); +err_component_unbind: + component_unbind_all(dev, wcd937x); + return ret; } static void wcd937x_unbind(struct device *dev) @@ -2825,6 +2848,8 @@ static void wcd937x_unbind(struct device *dev) device_link_remove(wcd937x->rxdev, wcd937x->txdev); component_unbind_all(dev, wcd937x); mutex_destroy(&wcd937x->micb_lock); + put_device(wcd937x->txdev); + put_device(wcd937x->rxdev); } static const struct component_master_ops wcd937x_comp_ops = { -- 2.17.1

4 weeks

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[PATCH] MAINTAINERS: add test_kho to KHO's entry

by Pratyush Yadav

Commit b753522bed0b7 ("kho: add test for kexec handover") introduced the KHO test but missed adding it to KHO's MAINTAINERS entry. Add it so the KHO maintainers can get patches for its test. Cc: stable(a)vger.kernel.org Fixes: b753522bed0b7 ("kho: add test for kexec handover") Signed-off-by: Pratyush Yadav <pratyush(a)kernel.org> --- MAINTAINERS | 1 + 1 file changed, 1 insertion(+) diff --git a/MAINTAINERS b/MAINTAINERS index 05e336174ede5..b0873f8ebcda6 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -13799,6 +13799,7 @@ F: Documentation/admin-guide/mm/kho.rst F: Documentation/core-api/kho/* F: include/linux/kexec_handover.h F: kernel/liveupdate/kexec_handover* +F: lib/test_kho.c F: tools/testing/selftests/kho/ KEYS-ENCRYPTED -- 2.47.3

4 weeks

4
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[Patch v2] mm/huge_memory: fix NULL pointer deference when splitting folio

by Wei Yang

Commit c010d47f107f ("mm: thp: split huge page to any lower order pages") introduced an early check on the folio's order via mapping->flags before proceeding with the split work. This check introduced a bug: for shmem folios in the swap cache and truncated folios, the mapping pointer can be NULL. Accessing mapping->flags in this state leads directly to a NULL pointer dereference. This commit fixes the issue by moving the check for mapping != NULL before any attempt to access mapping->flags. Fixes: c010d47f107f ("mm: thp: split huge page to any lower order pages") Signed-off-by: Wei Yang <richard.weiyang(a)gmail.com> Cc: Zi Yan <ziy(a)nvidia.com> Cc: "David Hildenbrand (Red Hat)" <david(a)kernel.org> Cc: <stable(a)vger.kernel.org> --- This patch is based on current mm-new, latest commit: febb34c02328 dt-bindings: riscv: Add Svrsw60t59b extension description v2: * just move folio->mapping ahead --- mm/huge_memory.c | 22 ++++++++++------------ 1 file changed, 10 insertions(+), 12 deletions(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index efea42d68157..4e9e920f306d 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -3929,6 +3929,16 @@ static int __folio_split(struct folio *folio, unsigned int new_order, if (folio != page_folio(split_at) || folio != page_folio(lock_at)) return -EINVAL; + /* + * Folios that just got truncated cannot get split. Signal to the + * caller that there was a race. + * + * TODO: this will also currently refuse shmem folios that are in the + * swapcache. + */ + if (!is_anon && !folio->mapping) + return -EBUSY; + if (new_order >= old_order) return -EINVAL; @@ -3965,18 +3975,6 @@ static int __folio_split(struct folio *folio, unsigned int new_order, gfp_t gfp; mapping = folio->mapping; - - /* Truncated ? */ - /* - * TODO: add support for large shmem folio in swap cache. - * When shmem is in swap cache, mapping is NULL and - * folio_test_swapcache() is true. - */ - if (!mapping) { - ret = -EBUSY; - goto out; - } - min_order = mapping_min_folio_order(folio->mapping); if (new_order < min_order) { ret = -EINVAL; -- 2.34.1

4 weeks

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[PATCH] LoongArch: Don't panic if no valid cache info for PCI

by Huacai Chen

If there is no valid cache info detected (may happen in virtual machine) for pci_dfl_cache_line_size, kernel shouldn't panic. Because in the PCI core it will be evaluated to (L1_CACHE_BYTES >> 2). Cc: <stable(a)vger.kernel.org> Signed-off-by: Jiaxun Yang <jiaxun.yang(a)flygoat.com> Signed-off-by: Huacai Chen <chenhuacai(a)loongson.cn> --- arch/loongarch/pci/pci.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/loongarch/pci/pci.c b/arch/loongarch/pci/pci.c index 5bc9627a6cf9..d9fc5d520b37 100644 --- a/arch/loongarch/pci/pci.c +++ b/arch/loongarch/pci/pci.c @@ -50,11 +50,11 @@ static int __init pcibios_init(void) */ lsize = cpu_last_level_cache_line_size(); - BUG_ON(!lsize); + if (lsize) { + pci_dfl_cache_line_size = lsize >> 2; - pci_dfl_cache_line_size = lsize >> 2; - - pr_debug("PCI: pci_cache_line_size set to %d bytes\n", lsize); + pr_debug("PCI: pci_cache_line_size set to %d bytes\n", lsize); + } return 0; } -- 2.47.3

4 weeks

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[PATCH v3] usb: dwc3: Fix race condition between concurrent dwc3_remove_requests() call paths

by Manish Nagar

This patch addresses a race condition caused by unsynchronized execution of multiple call paths invoking `dwc3_remove_requests()`, leading to premature freeing of USB requests and subsequent crashes. Three distinct execution paths interact with `dwc3_remove_requests()`: Path 1: Triggered via `dwc3_gadget_reset_interrupt()` during USB reset handling. The call stack includes: - `dwc3_ep0_reset_state()` - `dwc3_ep0_stall_and_restart()` - `dwc3_ep0_out_start()` - `dwc3_remove_requests()` - `dwc3_gadget_del_and_unmap_request()` Path 2: Also initiated from `dwc3_gadget_reset_interrupt()`, but through `dwc3_stop_active_transfers()`. The call stack includes: - `dwc3_stop_active_transfers()` - `dwc3_remove_requests()` - `dwc3_gadget_del_and_unmap_request()` Path 3: Occurs independently during `adb root` execution, which triggers USB function unbind and bind operations. The sequence includes: - `gserial_disconnect()` - `usb_ep_disable()` - `dwc3_gadget_ep_disable()` - `dwc3_remove_requests()` with `-ESHUTDOWN` status Path 3 operates asynchronously and lacks synchronization with Paths 1 and 2. When Path 3 completes, it disables endpoints and frees 'out' requests. If Paths 1 or 2 are still processing these requests, accessing freed memory leads to a crash due to use-after-free conditions. To fix this added check for request completion and skip processing if already completed and added the request status for ep0 while queue. Fixes: 72246da40f37 ("usb: Introduce DesignWare USB3 DRD Driver") Cc: stable(a)vger.kernel.org Suggested-by: Thinh Nguyen <Thinh.Nguyen(a)synopsys.com> Acked-by: Thinh Nguyen <Thinh.Nguyen(a)synopsys.com> Signed-off-by: Manish Nagar <manish.nagar(a)oss.qualcomm.com> --- Changes in v3: - Add the fixes tag , cc stable and acked-by tag. Changes in v2: - Add a check for request completion, in v1 I am avoiding this by wait for completion for ep0 then process the other eps. Link to v2: Link: https://lore.kernel.org/all/20251119171926.1622603-1-manish.nagar@oss.qualc… Link to v1: Link: https://lore.kernel.org/all/20251028080553.618304-1-manish.nagar@oss.qualco… drivers/usb/dwc3/ep0.c | 1 + drivers/usb/dwc3/gadget.c | 7 +++++++ 2 files changed, 8 insertions(+) diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c index b4229aa13f37..e0bad5708664 100644 --- a/drivers/usb/dwc3/ep0.c +++ b/drivers/usb/dwc3/ep0.c @@ -94,6 +94,7 @@ static int __dwc3_gadget_ep0_queue(struct dwc3_ep *dep, req->request.actual = 0; req->request.status = -EINPROGRESS; req->epnum = dep->number; + req->status = DWC3_REQUEST_STATUS_QUEUED; list_add_tail(&req->list, &dep->pending_list); diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 6f18b4840a25..5e4997f974dd 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -228,6 +228,13 @@ void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req, { struct dwc3 *dwc = dep->dwc; + /* + * The request might have been processed and completed while the + * spinlock was released. Skip processing if already completed. + */ + if (req->status == DWC3_REQUEST_STATUS_COMPLETED) + return; + dwc3_gadget_del_and_unmap_request(dep, req, status); req->status = DWC3_REQUEST_STATUS_COMPLETED; -- 2.25.1

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