FAILED: patch "[PATCH] media: cec: forgot to cancel delayed work" failed to apply to 4.19-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 4.19-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>.

thanks,

greg k-h

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

>From 490d84f6d73c12f4204241cff8651eed60aae914 Mon Sep 17 00:00:00 2001
From: Hans Verkuil <hverkuil@xs4all.nl>
Date: Mon, 15 Oct 2018 06:14:22 -0400
Subject: [PATCH] media: cec: forgot to cancel delayed work

If the wait for completion was interrupted, then make sure to cancel
any delayed work.

This can only happen if a transmit is waiting for a reply, and you press
Ctrl-C or reboot/poweroff or something like that which interrupts the
thread waiting for the reply and then proceeds to delete the CEC message.

Since the delayed work wasn't canceled, once it would trigger it referred
to stale data and resulted in a kernel oops.

Fixes: 7ec2b3b941a6 ("cec: add new tx/rx status bits to detect aborts/timeouts")

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Cc: <stable@vger.kernel.org>      # for v4.18 and up
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

diff --git a/drivers/media/cec/cec-adap.c b/drivers/media/cec/cec-adap.c
index 0c0d9107383e..31d1f4ab915e 100644
--- a/drivers/media/cec/cec-adap.c
+++ b/drivers/media/cec/cec-adap.c
@@ -844,6 +844,8 @@ int cec_transmit_msg_fh(struct cec_adapter *adap, struct cec_msg *msg,
 	 */
 	mutex_unlock(&adap->lock);
 	wait_for_completion_killable(&data->c);
+	if (!data->completed)
+		cancel_delayed_work_sync(&data->work);
 	mutex_lock(&adap->lock);
 
 	/* Cancel the transmit if it was interrupted */