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[PATCH net v3] bnxt_en: Fix NULL pointer crash in bnxt_ptp_enable during error cleanup

by Breno Leitao

When bnxt_init_one() fails during initialization (e.g., bnxt_init_int_mode returns -ENODEV), the error path calls bnxt_free_hwrm_resources() which destroys the DMA pool and sets bp->hwrm_dma_pool to NULL. Subsequently, bnxt_ptp_clear() is called, which invokes ptp_clock_unregister(). Since commit a60fc3294a37 ("ptp: rework ptp_clock_unregister() to disable events"), ptp_clock_unregister() now calls ptp_disable_all_events(), which in turn invokes the driver's .enable() callback (bnxt_ptp_enable()) to disable PTP events before completing the unregistration. bnxt_ptp_enable() attempts to send HWRM commands via bnxt_ptp_cfg_pin() and bnxt_ptp_cfg_event(), both of which call hwrm_req_init(). This function tries to allocate from bp->hwrm_dma_pool, causing a NULL pointer dereference: bnxt_en 0000:01:00.0 (unnamed net_device) (uninitialized): bnxt_init_int_mode err: ffffffed KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] Call Trace: __hwrm_req_init (drivers/net/ethernet/broadcom/bnxt/bnxt_hwrm.c:72) bnxt_ptp_enable (drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c:323 drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c:517) ptp_disable_all_events (drivers/ptp/ptp_chardev.c:66) ptp_clock_unregister (drivers/ptp/ptp_clock.c:518) bnxt_ptp_clear (drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c:1134) bnxt_init_one (drivers/net/ethernet/broadcom/bnxt/bnxt.c:16889) Lines are against commit f8f9c1f4d0c7 ("Linux 6.19-rc3") Fix this by clearing and unregistering ptp (bnxt_ptp_clear()) before freeing HWRM resources. Suggested-by: Pavan Chebbi <pavan.chebbi(a)broadcom.com> Signed-off-by: Breno Leitao <leitao(a)debian.org> Fixes: a60fc3294a37 ("ptp: rework ptp_clock_unregister() to disable events") Cc: stable(a)vger.kernel.org --- Changes in v3: - Moved bp->ptp_cfg to be closer to the kfree(). (Pavan/Jakub) - Link to v2: https://patch.msgid.link/20260105-bnxt-v2-1-9ac69edef726@debian.org Changes in v2: - Instead of checking for HWRM resources in bnxt_ptp_enable(), call it when HWRM resources are availble (Pavan Chebbi) - Link to v1: https://patch.msgid.link/20251231-bnxt-v1-1-8f9cde6698b4@debian.org --- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c index d160e54ac121..8419d1eb4035 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -16891,12 +16891,12 @@ static int bnxt_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) init_err_pci_clean: bnxt_hwrm_func_drv_unrgtr(bp); - bnxt_free_hwrm_resources(bp); - bnxt_hwmon_uninit(bp); - bnxt_ethtool_free(bp); bnxt_ptp_clear(bp); kfree(bp->ptp_cfg); bp->ptp_cfg = NULL; + bnxt_free_hwrm_resources(bp); + bnxt_hwmon_uninit(bp); + bnxt_ethtool_free(bp); kfree(bp->fw_health); bp->fw_health = NULL; bnxt_cleanup_pci(bp); --- base-commit: e146b276a817807b8f4a94b5781bf80c6c00601b change-id: 20251231-bnxt-c54d317d8bfe Best regards, -- Breno Leitao <leitao(a)debian.org>

17 hours, 35 minutes

[PATCH v2 0/2] block/blk-mq: fix RT kernel issues and interrupt context warnings

by Ionut Nechita (WindRiver)

From: Ionut Nechita <ionut.nechita(a)windriver.com> This series addresses two critical issues in the block layer multiqueue (blk-mq) subsystem when running on PREEMPT_RT kernels. The first patch fixes a severe performance regression where queue_lock contention in the I/O hot path causes IRQ threads to sleep on RT kernels. Testing on MegaRAID 12GSAS controller showed a 76% performance drop (640 MB/s -> 153 MB/s). The fix replaces spinlock with memory barriers to maintain ordering without sleeping. The second patch fixes a WARN_ON that triggers during SCSI device scanning when blk_freeze_queue_start() calls blk_mq_run_hw_queues() synchronously from interrupt context. The warning "WARN_ON_ONCE(!async && in_interrupt())" is resolved by switching to asynchronous execution. Changes in v2: - Removed the blk_mq_cpuhp_lock patch (needs more investigation) - Added fix for WARN_ON in interrupt context during queue freezing - Updated commit messages for clarity Ionut Nechita (2): block/blk-mq: fix RT kernel regression with queue_lock in hot path block: Fix WARN_ON in blk_mq_run_hw_queue when called from interrupt context block/blk-mq.c | 21 +++++++++------------ 1 file changed, 9 insertions(+), 12 deletions(-) -- 2.52.0

17 hours, 40 minutes

FAILED: patch "[PATCH] pmdomain: imx: Fix reference count leak in imx_gpc_probe()" failed to apply to 6.6-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 6.6-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y git checkout FETCH_HEAD git cherry-pick -x 73cb5f6eafb0ac7aea8cdeb8ff12981aa741d8fb # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2026010514-aerospace-cathouse-bd44@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 73cb5f6eafb0ac7aea8cdeb8ff12981aa741d8fb Mon Sep 17 00:00:00 2001 From: Wentao Liang <vulab(a)iscas.ac.cn> Date: Thu, 11 Dec 2025 04:02:52 +0000 Subject: [PATCH] pmdomain: imx: Fix reference count leak in imx_gpc_probe() of_get_child_by_name() returns a node pointer with refcount incremented. Use the __free() attribute to manage the pgc_node reference, ensuring automatic of_node_put() cleanup when pgc_node goes out of scope. This eliminates the need for explicit error handling paths and avoids reference count leaks. Fixes: 721cabf6c660 ("soc: imx: move PGC handling to a new GPC driver") Cc: stable(a)vger.kernel.org Signed-off-by: Wentao Liang <vulab(a)iscas.ac.cn> Reviewed-by: Frank Li <Frank.Li(a)nxp.com> Signed-off-by: Ulf Hansson <ulf.hansson(a)linaro.org> diff --git a/drivers/pmdomain/imx/gpc.c b/drivers/pmdomain/imx/gpc.c index a34b260274f7..de695f1944ab 100644 --- a/drivers/pmdomain/imx/gpc.c +++ b/drivers/pmdomain/imx/gpc.c @@ -402,13 +402,12 @@ static int imx_gpc_old_dt_init(struct device *dev, struct regmap *regmap, static int imx_gpc_probe(struct platform_device *pdev) { const struct imx_gpc_dt_data *of_id_data = device_get_match_data(&pdev->dev); - struct device_node *pgc_node; + struct device_node *pgc_node __free(device_node) + = of_get_child_by_name(pdev->dev.of_node, "pgc"); struct regmap *regmap; void __iomem *base; int ret; - pgc_node = of_get_child_by_name(pdev->dev.of_node, "pgc"); - /* bail out if DT too old and doesn't provide the necessary info */ if (!of_property_present(pdev->dev.of_node, "#power-domain-cells") && !pgc_node)

18 hours, 20 minutes

[PATCH v2] Revert "gpio: swnode: don't use the swnode's name as the key for GPIO lookup"

by Charles Keepax

This reverts commit e5d527be7e6984882306b49c067f1fec18920735. This software node change doesn't actually fix any current issues with the kernel, it is an improvement to the lookup process rather than fixing a live bug. It also causes a couple of regressions with shipping laptops, which relied on the label based lookup. There is a fix for the regressions in mainline, the first 5 patches of [1]. However, those patches are fairly substantial changes and given the patch causing the regression doesn't actually fix a bug it seems better to just revert it in stable. CC: stable(a)vger.kernel.org # 6.18 Link: https://lore.kernel.org/linux-sound/20251120-reset-gpios-swnodes-v7-0-a1004… [1] Closes: https://github.com/thesofproject/linux/issues/5599 Closes: https://github.com/thesofproject/linux/issues/5603 Acked-by: Bartosz Golaszewski <bartosz.golaszewski(a)linaro.org> Signed-off-by: Charles Keepax <ckeepax(a)opensource.cirrus.com> --- Changes since v1: - Corrected commit ID to match 6.18 drivers/gpio/gpiolib-swnode.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpio/gpiolib-swnode.c b/drivers/gpio/gpiolib-swnode.c index e3806db1c0e07..f21dbc28cf2c8 100644 --- a/drivers/gpio/gpiolib-swnode.c +++ b/drivers/gpio/gpiolib-swnode.c @@ -41,7 +41,7 @@ static struct gpio_device *swnode_get_gpio_device(struct fwnode_handle *fwnode) !strcmp(gdev_node->name, GPIOLIB_SWNODE_UNDEFINED_NAME)) return ERR_PTR(-ENOENT); - gdev = gpio_device_find_by_fwnode(fwnode); + gdev = gpio_device_find_by_label(gdev_node->name); return gdev ?: ERR_PTR(-EPROBE_DEFER); } -- 2.47.3

18 hours, 22 minutes

[PATCH 5.4.y] net: hsr: avoid possible NULL deref in skb_clone()

by Yunshui Jiang

From: Eric Dumazet <edumazet(a)google.com> [ Upstream commit d8b57135fd9ffe9a5b445350a686442a531c5339 ] Changes from upstream: Modify the logic of frame_get_stripped_skb() instead of hsr_get_untagged_frame because the 5.4 kernel API has not been updated yet. Keep the core logic identical to upstream commit d8b57135fd9f. syzbot got a crash [1] in skb_clone(), caused by a bug in hsr_get_untagged_frame(). When/if create_stripped_skb_hsr() returns NULL, we must not attempt to call skb_clone(). While we are at it, replace a WARN_ONCE() by netdev_warn_once(). [1] general protection fault, probably for non-canonical address 0xdffffc000000000f: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000078-0x000000000000007f] CPU: 1 PID: 754 Comm: syz-executor.0 Not tainted 6.0.0-syzkaller-02734-g0326074ff465 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 RIP: 0010:skb_clone+0x108/0x3c0 net/core/skbuff.c:1641 Code: 93 02 00 00 49 83 7c 24 28 00 0f 85 e9 00 00 00 e8 5d 4a 29 fa 4c 8d 75 7e 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <0f> b6 04 02 4c 89 f2 83 e2 07 38 d0 7f 08 84 c0 0f 85 9e 01 00 00 RSP: 0018:ffffc90003ccf4e0 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: ffffc90003ccf5f8 RCX: ffffc9000c24b000 RDX: 000000000000000f RSI: ffffffff8751cb13 RDI: 0000000000000000 RBP: 0000000000000000 R08: 00000000000000f0 R09: 0000000000000140 R10: fffffbfff181d972 R11: 0000000000000000 R12: ffff888161fc3640 R13: 0000000000000a20 R14: 000000000000007e R15: ffffffff8dc5f620 FS: 00007feb621e4700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007feb621e3ff8 CR3: 00000001643a9000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> hsr_get_untagged_frame+0x4e/0x610 net/hsr/hsr_forward.c:164 hsr_forward_do net/hsr/hsr_forward.c:461 [inline] hsr_forward_skb+0xcca/0x1d50 net/hsr/hsr_forward.c:623 hsr_handle_frame+0x588/0x7c0 net/hsr/hsr_slave.c:69 __netif_receive_skb_core+0x9fe/0x38f0 net/core/dev.c:5379 __netif_receive_skb_one_core+0xae/0x180 net/core/dev.c:5483 __netif_receive_skb+0x1f/0x1c0 net/core/dev.c:5599 netif_receive_skb_internal net/core/dev.c:5685 [inline] netif_receive_skb+0x12f/0x8d0 net/core/dev.c:5744 tun_rx_batched+0x4ab/0x7a0 drivers/net/tun.c:1544 tun_get_user+0x2686/0x3a00 drivers/net/tun.c:1995 tun_chr_write_iter+0xdb/0x200 drivers/net/tun.c:2025 call_write_iter include/linux/fs.h:2187 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x9e9/0xdd0 fs/read_write.c:584 ksys_write+0x127/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Cc: stable(a)vger.kernel.org Fixes: f266a683a480 ("net/hsr: Better frame dispatch") Reported-by: syzbot <syzkaller(a)googlegroups.com> Signed-off-by: Eric Dumazet <edumazet(a)google.com> Link: https://lore.kernel.org/r/20221017165928.2150130-1-edumazet@google.com Signed-off-by: Jakub Kicinski <kuba(a)kernel.org> Signed-off-by: Yunshui Jiang <jiangyunshui(a)kylinos.cn> --- net/hsr/hsr_forward.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/net/hsr/hsr_forward.c b/net/hsr/hsr_forward.c index 7073724fdfa6..5c1b9cd6dd52 100644 --- a/net/hsr/hsr_forward.c +++ b/net/hsr/hsr_forward.c @@ -115,8 +115,17 @@ static struct sk_buff *create_stripped_skb(struct sk_buff *skb_in, static struct sk_buff *frame_get_stripped_skb(struct hsr_frame_info *frame, struct hsr_port *port) { - if (!frame->skb_std) - frame->skb_std = create_stripped_skb(frame->skb_hsr, frame); + if (!frame->skb_std) { + if (frame->skb_hsr) + frame->skb_std = + create_stripped_skb(frame->skb_hsr, frame); + else + netdev_warn_once(port->dev, + "Unexpected frame received in hsr_get_untagged_frame()\n"); + + if (!frame->skb_std) + return NULL; + } return skb_clone(frame->skb_std, GFP_ATOMIC); } -- 2.47.1

18 hours, 36 minutes

[PATCH net v3 1/3] virtio-net: don't schedule delayed refill worker

by Bui Quang Minh

When we fail to refill the receive buffers, we schedule a delayed worker to retry later. However, this worker creates some concurrency issues. For example, when the worker runs concurrently with virtnet_xdp_set, both need to temporarily disable queue's NAPI before enabling again. Without proper synchronization, a deadlock can happen when napi_disable() is called on an already disabled NAPI. That napi_disable() call will be stuck and so will the subsequent napi_enable() call. To simplify the logic and avoid further problems, we will instead retry refilling in the next NAPI poll. Fixes: 4bc12818b363 ("virtio-net: disable delayed refill when pausing rx") Reported-by: Paolo Abeni <pabeni(a)redhat.com> Closes: https://netdev-ctrl.bots.linux.dev/logs/vmksft/drv-hw-dbg/results/400961/3-… Cc: stable(a)vger.kernel.org Suggested-by: Xuan Zhuo <xuanzhuo(a)linux.alibaba.com> Signed-off-by: Bui Quang Minh <minhquangbui99(a)gmail.com> --- drivers/net/virtio_net.c | 48 +++++++++++++++++++++------------------- 1 file changed, 25 insertions(+), 23 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 1bb3aeca66c6..f986abf0c236 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -3046,16 +3046,16 @@ static int virtnet_receive(struct receive_queue *rq, int budget, else packets = virtnet_receive_packets(vi, rq, budget, xdp_xmit, &stats); + u64_stats_set(&stats.packets, packets); if (rq->vq->num_free > min((unsigned int)budget, virtqueue_get_vring_size(rq->vq)) / 2) { - if (!try_fill_recv(vi, rq, GFP_ATOMIC)) { - spin_lock(&vi->refill_lock); - if (vi->refill_enabled) - schedule_delayed_work(&vi->refill, 0); - spin_unlock(&vi->refill_lock); - } + if (!try_fill_recv(vi, rq, GFP_ATOMIC)) + /* We need to retry refilling in the next NAPI poll so + * we must return budget to make sure the NAPI is + * repolled. + */ + packets = budget; } - u64_stats_set(&stats.packets, packets); u64_stats_update_begin(&rq->stats.syncp); for (i = 0; i < ARRAY_SIZE(virtnet_rq_stats_desc); i++) { size_t offset = virtnet_rq_stats_desc[i].offset; @@ -3230,9 +3230,10 @@ static int virtnet_open(struct net_device *dev) for (i = 0; i < vi->max_queue_pairs; i++) { if (i < vi->curr_queue_pairs) - /* Make sure we have some buffers: if oom use wq. */ - if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) - schedule_delayed_work(&vi->refill, 0); + /* Pre-fill rq agressively, to make sure we are ready to + * get packets immediately. + */ + try_fill_recv(vi, &vi->rq[i], GFP_KERNEL); err = virtnet_enable_queue_pair(vi, i); if (err < 0) @@ -3472,16 +3473,15 @@ static void __virtnet_rx_resume(struct virtnet_info *vi, struct receive_queue *rq, bool refill) { - bool running = netif_running(vi->dev); - bool schedule_refill = false; + if (netif_running(vi->dev)) { + /* Pre-fill rq agressively, to make sure we are ready to get + * packets immediately. + */ + if (refill) + try_fill_recv(vi, rq, GFP_KERNEL); - if (refill && !try_fill_recv(vi, rq, GFP_KERNEL)) - schedule_refill = true; - if (running) virtnet_napi_enable(rq); - - if (schedule_refill) - schedule_delayed_work(&vi->refill, 0); + } } static void virtnet_rx_resume_all(struct virtnet_info *vi) @@ -3829,11 +3829,13 @@ static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) } succ: vi->curr_queue_pairs = queue_pairs; - /* virtnet_open() will refill when device is going to up. */ - spin_lock_bh(&vi->refill_lock); - if (dev->flags & IFF_UP && vi->refill_enabled) - schedule_delayed_work(&vi->refill, 0); - spin_unlock_bh(&vi->refill_lock); + if (dev->flags & IFF_UP) { + local_bh_disable(); + for (int i = 0; i < vi->curr_queue_pairs; ++i) + virtqueue_napi_schedule(&vi->rq[i].napi, vi->rq[i].vq); + + local_bh_enable(); + } return 0; } -- 2.43.0

18 hours, 37 minutes

FAILED: patch "[PATCH] drm/mediatek: ovl_adaptor: Fix probe device leaks" failed to apply to 6.12-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 6.12-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.12.y git checkout FETCH_HEAD git cherry-pick -x e0f44f74ed6313e50b38eb39a2c7f210ae208db2 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2026010623-surrender-evolve-4b79@gregkh' --subject-prefix 'PATCH 6.12.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From e0f44f74ed6313e50b38eb39a2c7f210ae208db2 Mon Sep 17 00:00:00 2001 From: Johan Hovold <johan(a)kernel.org> Date: Tue, 23 Sep 2025 17:23:40 +0200 Subject: [PATCH] drm/mediatek: ovl_adaptor: Fix probe device leaks Make sure to drop the references taken to the component devices by of_find_device_by_node() during probe on probe failure (e.g. probe deferral) and on driver unbind. Fixes: 453c3364632a ("drm/mediatek: Add ovl_adaptor support for MT8195") Cc: stable(a)vger.kernel.org # 6.4 Cc: Nancy.Lin <nancy.lin(a)mediatek.com> Signed-off-by: Johan Hovold <johan(a)kernel.org> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno(a)collabora.com> Link: https://patchwork.kernel.org/project/dri-devel/patch/20250923152340.18234-6… Signed-off-by: Chun-Kuang Hu <chunkuang.hu(a)kernel.org> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c index fe97bb97e004..c0af3e3b51d5 100644 --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c @@ -527,6 +527,13 @@ bool mtk_ovl_adaptor_is_comp_present(struct device_node *node) type == OVL_ADAPTOR_TYPE_PADDING; } +static void ovl_adaptor_put_device(void *_dev) +{ + struct device *dev = _dev; + + put_device(dev); +} + static int ovl_adaptor_comp_init(struct device *dev, struct component_match **match) { struct mtk_disp_ovl_adaptor *priv = dev_get_drvdata(dev); @@ -560,6 +567,11 @@ static int ovl_adaptor_comp_init(struct device *dev, struct component_match **ma if (!comp_pdev) return -EPROBE_DEFER; + ret = devm_add_action_or_reset(dev, ovl_adaptor_put_device, + &comp_pdev->dev); + if (ret) + return ret; + priv->ovl_adaptor_comp[id] = &comp_pdev->dev; drm_of_component_match_add(dev, match, component_compare_of, node);

18 hours, 39 minutes

[PATCH mm-hotfixes] mm/page_alloc: prevent pcp corruption with SMP=n

by Vlastimil Babka

The kernel test robot has reported: BUG: spinlock trylock failure on UP on CPU#0, kcompactd0/28 lock: 0xffff888807e35ef0, .magic: dead4ead, .owner: kcompactd0/28, .owner_cpu: 0 CPU: 0 UID: 0 PID: 28 Comm: kcompactd0 Not tainted 6.18.0-rc5-00127-ga06157804399 #1 PREEMPT 8cc09ef94dcec767faa911515ce9e609c45db470 Call Trace: <IRQ> __dump_stack (lib/dump_stack.c:95) dump_stack_lvl (lib/dump_stack.c:123) dump_stack (lib/dump_stack.c:130) spin_dump (kernel/locking/spinlock_debug.c:71) do_raw_spin_trylock (kernel/locking/spinlock_debug.c:?) _raw_spin_trylock (include/linux/spinlock_api_smp.h:89 kernel/locking/spinlock.c:138) __free_frozen_pages (mm/page_alloc.c:2973) ___free_pages (mm/page_alloc.c:5295) __free_pages (mm/page_alloc.c:5334) tlb_remove_table_rcu (include/linux/mm.h:? include/linux/mm.h:3122 include/asm-generic/tlb.h:220 mm/mmu_gather.c:227 mm/mmu_gather.c:290) ? __cfi_tlb_remove_table_rcu (mm/mmu_gather.c:289) ? rcu_core (kernel/rcu/tree.c:?) rcu_core (include/linux/rcupdate.h:341 kernel/rcu/tree.c:2607 kernel/rcu/tree.c:2861) rcu_core_si (kernel/rcu/tree.c:2879) handle_softirqs (arch/x86/include/asm/jump_label.h:36 include/trace/events/irq.h:142 kernel/softirq.c:623) __irq_exit_rcu (arch/x86/include/asm/jump_label.h:36 kernel/softirq.c:725) irq_exit_rcu (kernel/softirq.c:741) sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1052) </IRQ> <TASK> RIP: 0010:_raw_spin_unlock_irqrestore (arch/x86/include/asm/preempt.h:95 include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) free_pcppages_bulk (mm/page_alloc.c:1494) drain_pages_zone (include/linux/spinlock.h:391 mm/page_alloc.c:2632) __drain_all_pages (mm/page_alloc.c:2731) drain_all_pages (mm/page_alloc.c:2747) kcompactd (mm/compaction.c:3115) kthread (kernel/kthread.c:465) ? __cfi_kcompactd (mm/compaction.c:3166) ? __cfi_kthread (kernel/kthread.c:412) ret_from_fork (arch/x86/kernel/process.c:164) ? __cfi_kthread (kernel/kthread.c:412) ret_from_fork_asm (arch/x86/entry/entry_64.S:255) </TASK> Matthew has analyzed the report and identified that in drain_page_zone() we are in a section protected by spin_lock(&pcp->lock) and then get an interrupt that attempts spin_trylock() on the same lock. The code is designed to work this way without disabling IRQs and occasionally fail the trylock with a fallback. However, the SMP=n spinlock implementation assumes spin_trylock() will always succeed, and thus it's normally a no-op. Here the enabled lock debugging catches the problem, but otherwise it could cause a corruption of the pcp structure. The problem has been introduced by commit 574907741599 ("mm/page_alloc: leave IRQs enabled for per-cpu page allocations"). The pcp locking scheme recognizes the need for disabling IRQs to prevent nesting spin_trylock() sections on SMP=n, but the need to prevent the nesting in spin_lock() has not been recognized. Fix it by introducing local wrappers that change the spin_lock() to spin_lock_iqsave() with SMP=n and use them in all places that do spin_lock(&pcp->lock). Fixes: 574907741599 ("mm/page_alloc: leave IRQs enabled for per-cpu page allocations") Cc: stable(a)vger.kernel.org Reported-by: kernel test robot <oliver.sang(a)intel.com> Closes: https://lore.kernel.org/oe-lkp/202512101320.e2f2dd6f-lkp@intel.com Analyzed-by: Matthew Wilcox <willy(a)infradead.org> Link: https://lore.kernel.org/all/aUW05pyc9nZkvY-1@casper.infradead.org/ Signed-off-by: Vlastimil Babka <vbabka(a)suse.cz> --- This fix is intentionally made self-contained and not trying to expand upon the existing pcp[u]_spin() helpers. This is to make stable backports easier due to recent cleanups to that helpers. We could follow up with a proper helpers integration going forward. However I think the assumptions SMP=n of the spinlock UP implementation are just wrong. It should be valid to do a spin_lock() without disabling irq's and rely on a nested spin_trylock() to fail. I will thus try proposing the remove the UP implementation first. It should be within the current trend of removing stuff that's optimized for a minority configuration if it makes maintainability of the majority worse. (c.f. recent scheduler SMP=n removal) --- mm/page_alloc.c | 45 +++++++++++++++++++++++++++++++++++++-------- 1 file changed, 37 insertions(+), 8 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 822e05f1a964..ec3551d56cde 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -167,6 +167,31 @@ static inline void __pcp_trylock_noop(unsigned long *flags) { } pcp_trylock_finish(UP_flags); \ }) +/* + * With the UP spinlock implementation, when we spin_lock(&pcp->lock) (for i.e. + * a potentially remote cpu drain) and get interrupted by an operation that + * attempts pcp_spin_trylock(), we can't rely on the trylock failure due to UP + * spinlock assumptions making the trylock a no-op. So we have to turn that + * spin_lock() to a spin_lock_irqsave(). This works because on UP there are no + * remote cpu's so we can only be locking the only existing local one. + */ +#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT) +static inline void __flags_noop(unsigned long *flags) { } +#define spin_lock_maybe_irqsave(lock, flags) \ +({ \ + __flags_noop(&(flags)); \ + spin_lock(lock); \ +}) +#define spin_unlock_maybe_irqrestore(lock, flags) \ +({ \ + spin_unlock(lock); \ + __flags_noop(&(flags)); \ +}) +#else +#define spin_lock_maybe_irqsave(lock, flags) spin_lock_irqsave(lock, flags) +#define spin_unlock_maybe_irqrestore(lock, flags) spin_unlock_irqrestore(lock, flags) +#endif + #ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID DEFINE_PER_CPU(int, numa_node); EXPORT_PER_CPU_SYMBOL(numa_node); @@ -2556,6 +2581,7 @@ static int rmqueue_bulk(struct zone *zone, unsigned int order, bool decay_pcp_high(struct zone *zone, struct per_cpu_pages *pcp) { int high_min, to_drain, to_drain_batched, batch; + unsigned long UP_flags; bool todo = false; high_min = READ_ONCE(pcp->high_min); @@ -2575,9 +2601,9 @@ bool decay_pcp_high(struct zone *zone, struct per_cpu_pages *pcp) to_drain = pcp->count - pcp->high; while (to_drain > 0) { to_drain_batched = min(to_drain, batch); - spin_lock(&pcp->lock); + spin_lock_maybe_irqsave(&pcp->lock, UP_flags); free_pcppages_bulk(zone, to_drain_batched, pcp, 0); - spin_unlock(&pcp->lock); + spin_unlock_maybe_irqrestore(&pcp->lock, UP_flags); todo = true; to_drain -= to_drain_batched; @@ -2594,14 +2620,15 @@ bool decay_pcp_high(struct zone *zone, struct per_cpu_pages *pcp) */ void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp) { + unsigned long UP_flags; int to_drain, batch; batch = READ_ONCE(pcp->batch); to_drain = min(pcp->count, batch); if (to_drain > 0) { - spin_lock(&pcp->lock); + spin_lock_maybe_irqsave(&pcp->lock, UP_flags); free_pcppages_bulk(zone, to_drain, pcp, 0); - spin_unlock(&pcp->lock); + spin_unlock_maybe_irqrestore(&pcp->lock, UP_flags); } } #endif @@ -2612,10 +2639,11 @@ void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp) static void drain_pages_zone(unsigned int cpu, struct zone *zone) { struct per_cpu_pages *pcp = per_cpu_ptr(zone->per_cpu_pageset, cpu); + unsigned long UP_flags; int count; do { - spin_lock(&pcp->lock); + spin_lock_maybe_irqsave(&pcp->lock, UP_flags); count = pcp->count; if (count) { int to_drain = min(count, @@ -2624,7 +2652,7 @@ static void drain_pages_zone(unsigned int cpu, struct zone *zone) free_pcppages_bulk(zone, to_drain, pcp, 0); count -= to_drain; } - spin_unlock(&pcp->lock); + spin_unlock_maybe_irqrestore(&pcp->lock, UP_flags); } while (count); } @@ -6109,6 +6137,7 @@ static void zone_pcp_update_cacheinfo(struct zone *zone, unsigned int cpu) { struct per_cpu_pages *pcp; struct cpu_cacheinfo *cci; + unsigned long UP_flags; pcp = per_cpu_ptr(zone->per_cpu_pageset, cpu); cci = get_cpu_cacheinfo(cpu); @@ -6119,12 +6148,12 @@ static void zone_pcp_update_cacheinfo(struct zone *zone, unsigned int cpu) * This can reduce zone lock contention without hurting * cache-hot pages sharing. */ - spin_lock(&pcp->lock); + spin_lock_maybe_irqsave(&pcp->lock, UP_flags); if ((cci->per_cpu_data_slice_size >> PAGE_SHIFT) > 3 * pcp->batch) pcp->flags |= PCPF_FREE_HIGH_BATCH; else pcp->flags &= ~PCPF_FREE_HIGH_BATCH; - spin_unlock(&pcp->lock); + spin_unlock_maybe_irqrestore(&pcp->lock, UP_flags); } void setup_pcp_cacheinfo(unsigned int cpu) --- base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8 change-id: 20260105-fix-pcp-up-3c88c09752ec Best regards, -- Vlastimil Babka <vbabka(a)suse.cz>

18 hours, 54 minutes

FAILED: patch "[PATCH] drm/mediatek: ovl_adaptor: Fix probe device leaks" failed to apply to 6.6-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 6.6-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y git checkout FETCH_HEAD git cherry-pick -x e0f44f74ed6313e50b38eb39a2c7f210ae208db2 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2026010626-drainable-stricken-476d@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From e0f44f74ed6313e50b38eb39a2c7f210ae208db2 Mon Sep 17 00:00:00 2001 From: Johan Hovold <johan(a)kernel.org> Date: Tue, 23 Sep 2025 17:23:40 +0200 Subject: [PATCH] drm/mediatek: ovl_adaptor: Fix probe device leaks Make sure to drop the references taken to the component devices by of_find_device_by_node() during probe on probe failure (e.g. probe deferral) and on driver unbind. Fixes: 453c3364632a ("drm/mediatek: Add ovl_adaptor support for MT8195") Cc: stable(a)vger.kernel.org # 6.4 Cc: Nancy.Lin <nancy.lin(a)mediatek.com> Signed-off-by: Johan Hovold <johan(a)kernel.org> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno(a)collabora.com> Link: https://patchwork.kernel.org/project/dri-devel/patch/20250923152340.18234-6… Signed-off-by: Chun-Kuang Hu <chunkuang.hu(a)kernel.org> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c index fe97bb97e004..c0af3e3b51d5 100644 --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c @@ -527,6 +527,13 @@ bool mtk_ovl_adaptor_is_comp_present(struct device_node *node) type == OVL_ADAPTOR_TYPE_PADDING; } +static void ovl_adaptor_put_device(void *_dev) +{ + struct device *dev = _dev; + + put_device(dev); +} + static int ovl_adaptor_comp_init(struct device *dev, struct component_match **match) { struct mtk_disp_ovl_adaptor *priv = dev_get_drvdata(dev); @@ -560,6 +567,11 @@ static int ovl_adaptor_comp_init(struct device *dev, struct component_match **ma if (!comp_pdev) return -EPROBE_DEFER; + ret = devm_add_action_or_reset(dev, ovl_adaptor_put_device, + &comp_pdev->dev); + if (ret) + return ret; + priv->ovl_adaptor_comp[id] = &comp_pdev->dev; drm_of_component_match_add(dev, match, component_compare_of, node);

18 hours, 58 minutes

[PATCH RESEND] Revert "gpio: swnode: don't use the swnode's name as the key for GPIO lookup"

by Charles Keepax

This reverts commit 25decf0469d4c91d90aa2e28d996aed276bfc622. This software node change doesn't actually fix any current issues with the kernel, it is an improvement to the lookup process rather than fixing a live bug. It also causes a couple of regressions with shipping laptops, which relied on the label based lookup. There is a fix for the regressions in mainline, the first 5 patches of [1]. However, those patches are fairly substantial changes and given the patch causing the regression doesn't actually fix a bug it seems better to just revert it in stable. CC: stable(a)vger.kernel.org # 6.18 Link: https://lore.kernel.org/linux-sound/20251120-reset-gpios-swnodes-v7-0-a1004… [1] Closes: https://github.com/thesofproject/linux/issues/5599 Closes: https://github.com/thesofproject/linux/issues/5603 Acked-by: Bartosz Golaszewski <bartosz.golaszewski(a)linaro.org> Signed-off-by: Charles Keepax <ckeepax(a)opensource.cirrus.com> --- This fix for the software node lookups is also required on 6.18 stable, see the discussion for 6.12/6.17 in [2] for why we are doing a revert rather than backporting the other fixes. The "full" fixes are merged in 6.19 so this should be the last kernel we need to push this revert onto. Thanks, Charles drivers/gpio/gpiolib-swnode.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpio/gpiolib-swnode.c b/drivers/gpio/gpiolib-swnode.c index e3806db1c0e07..f21dbc28cf2c8 100644 --- a/drivers/gpio/gpiolib-swnode.c +++ b/drivers/gpio/gpiolib-swnode.c @@ -41,7 +41,7 @@ static struct gpio_device *swnode_get_gpio_device(struct fwnode_handle *fwnode) !strcmp(gdev_node->name, GPIOLIB_SWNODE_UNDEFINED_NAME)) return ERR_PTR(-ENOENT); - gdev = gpio_device_find_by_fwnode(fwnode); + gdev = gpio_device_find_by_label(gdev_node->name); return gdev ?: ERR_PTR(-EPROBE_DEFER); } -- 2.47.3

18 hours, 59 minutes

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