FAILED: patch "[PATCH] Input: hp_sdc - shut down kicker timer on module exit" failed to apply to 6.12-stable tree

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 <[email protected]>.

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 309731e95917125bbd13626a7a5600490a5bf44f
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026092213-clinking-taunt-b525@gregkh' --subject-prefix 'PATCH 6.12.y' 'HEAD^..'

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 309731e95917125bbd13626a7a5600490a5bf44f Mon Sep 17 00:00:00 2001
From: Runyu Xiao <[email protected]>
Date: Wed, 2 Sep 2026 23:40:04 +0800
Subject: [PATCH] Input: hp_sdc - shut down kicker timer on module exit

hp_sdc_kicker() rearms hp_sdc.kicker with mod_timer() after scheduling the tasklet. The module exit path uses timer_delete_sync(). That waits for a callback already running but can still leave the timer rearmed.

A callback can therefore leave the timer pending while hp_sdc_exit() tears down the driver, allowing timer activity to access dismantled driver state.

Use timer_shutdown_sync() for final teardown. It waits for a running callback and prevents rearming after module exit begins.

index 1461ef319f92..ecf5347b63ab 100644
@@ -981,7 +981,7 @@ static void hp_sdc_exit(void)
 	free_irq(hp_sdc.irq, &hp_sdc);
 	write_unlock_irq(&hp_sdc.lock);
 
-	timer_delete_sync(&hp_sdc.kicker);
+	timer_shutdown_sync(&hp_sdc.kicker);
 
 	tasklet_kill(&hp_sdc.task);
 

From: Runyu Xiao <[email protected]>

[ Upstream commit 309731e95917125bbd13626a7a5600490a5bf44f ]

hp_sdc_kicker() rearms hp_sdc.kicker with mod_timer() after scheduling the tasklet. The module exit path uses timer_delete_sync(). That waits for a callback already running but can still leave the timer rearmed.

A callback can therefore leave the timer pending while hp_sdc_exit() tears down the driver, allowing timer activity to access dismantled driver state.

Use timer_shutdown_sync() for final teardown. It waits for a running callback and prevents rearming after module exit begins.

---
 drivers/input/serio/hp_sdc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index 13eacf6ab4310..ee096d7c7846c 100644
@@ -980,7 +980,7 @@ static void hp_sdc_exit(void)
 	free_irq(hp_sdc.irq, &hp_sdc);
 	write_unlock_irq(&hp_sdc.lock);
 
-	del_timer_sync(&hp_sdc.kicker);
+	timer_shutdown_sync(&hp_sdc.kicker);
 
 	tasklet_kill(&hp_sdc.task);
 

2.53.0