Subject: FAILED: patch "[PATCH] Input: hp_sdc - shut down kicker timer on module exit" failed to apply to 6.12-stable tree
To: runyu.xiao@seu.edu.cn,deller@gmx.de,dmitry.torokhov@gmail.com
Cc: <stable@vger.kernel.org>
From: <gregkh@linuxfoundation.org>
Date: Tue, 22 Sep 2026 16:53:13 +0200
Message-ID: <2026092213-clinking-taunt-b525@gregkh>
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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@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 309731e95917125bbd13626a7a5600490a5bf44f
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --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 <runyu.xiao@seu.edu.cn>
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.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org
Assisted-by: Codex:GPT-5
Signed-off-by: Runyu Xiao <runyu.xiao@seu.edu.cn>
Acked-by: Helge Deller <deller@gmx.de>
Link: https://patch.msgid.link/20260902154004.3595416-1-runyu.xiao@seu.edu.cn
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/serio/hp_sdc.c b/drivers/input/serio/hp_sdc.c
index 1461ef319f92..ecf5347b63ab 100644
--- a/drivers/input/serio/hp_sdc.c
+++ b/drivers/input/serio/hp_sdc.c
@@ -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);