Subject: FAILED: patch "[PATCH] Input: ims-pcu - fix race condition in reset_device sysfs" failed to apply to 5.15-stable tree
To: dmitry.torokhov@gmail.com,sashiko-bot@kernel.org
Cc: <stable@vger.kernel.org>
From: <gregkh@linuxfoundation.org>
Date: Mon, 20 Jul 2026 17:46:30 +0200
Message-ID: <2026072030-handwork-earmuff-b1c2@gregkh>
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The patch below does not apply to the 5.15-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-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 411b8c4b274737c3bf08e1e025801161603cfffc
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026072030-handwork-earmuff-b1c2@gregkh' --subject-prefix 'PATCH 5.15.y' 'HEAD^..'

Possible dependencies:


thanks,

greg k-h

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

From 411b8c4b274737c3bf08e1e025801161603cfffc Mon Sep 17 00:00:00 2001
From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Date: Fri, 22 May 2026 10:29:04 -0700
Subject: [PATCH] Input: ims-pcu - fix race condition in reset_device sysfs
 callback

The ims_pcu_reset_device() sysfs callback calls ims_pcu_execute_command()
without acquiring pcu->cmd_mutex. This can lead to data races and
corruption of the shared command buffer if triggered concurrently with
other commands.

Acquire pcu->cmd_mutex before calling ims_pcu_execute_command().

Fixes: 628329d52474 ("Input: add IMS Passenger Control Unit driver")
Cc: stable@vger.kernel.org
Reported-by: Sashiko bot <sashiko-bot@kernel.org>
Assisted-by: Gemini:gemini-3.1-pro
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/misc/ims-pcu.c b/drivers/input/misc/ims-pcu.c
index 4f8265c0772f..39bc02ef3e53 100644
--- a/drivers/input/misc/ims-pcu.c
+++ b/drivers/input/misc/ims-pcu.c
@@ -1153,6 +1153,8 @@ static ssize_t ims_pcu_reset_device(struct device *dev,
 
 	dev_info(pcu->dev, "Attempting to reset device\n");
 
+	guard(mutex)(&pcu->cmd_mutex);
+
 	error = ims_pcu_execute_command(pcu, PCU_RESET, &reset_byte, 1);
 	if (error) {
 		dev_info(pcu->dev,