FAILED: patch "[PATCH] usb: gadget: uvc: Fix unstarted kthread worker" failed to apply to 6.13-stable tree

FAILED: patch "[PATCH] usb: gadget: uvc: Fix unstarted kthread worker" failed to apply to 6.13-stable tree

[gregkh]

The patch below does not apply to the 6.13-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-6.13.y
git checkout FETCH_HEAD
git cherry-pick -x e5644be4079750a0a0a5a7068fd90b97bf6fac55
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2025021831-mushiness-herbs-d06c@gregkh' --subject-prefix 'PATCH 6.13.y' HEAD^..

Possible dependencies:



thanks,

greg k-h

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

From e5644be4079750a0a0a5a7068fd90b97bf6fac55 Mon Sep 17 00:00:00 2001
From: Frederic Weisbecker <frederic@kernel.org>
Date: Wed, 12 Feb 2025 14:55:14 +0100
Subject: [PATCH] usb: gadget: uvc: Fix unstarted kthread worker

The behaviour of kthread_create_worker() was recently changed to align
with the one of kthread_create(). The kthread worker is created but not
awaken by default. This is to allow the use of kthread_affine_preferred()
and kthread_bind[_mask]() with kthread workers. In order to keep the
old behaviour and wake the kthread up, kthread_run_worker() must be
used. All the pre-existing users have been converted, except for UVC
that was introduced in the same merge window as the API change.

This results in hangs:

	INFO: task UVCG:82 blocked for more than 491 seconds.
	Tainted: G                T  6.13.0-rc2-00014-gb04e317b5226 #1
	task:UVCG            state:D stack:0     pid:82
	 Call Trace:
	 __schedule
	 schedule
	 schedule_preempt_disabled
	 kthread
	 ? kthread_flush_work
	 ret_from_fork
	 ret_from_fork_asm
	 entry_INT80_32

Fix this with converting UVCG kworker to the new API.

Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202502121025.55bfa801-lkp@intel.com
Fixes: f0bbfbd16b3b ("usb: gadget: uvc: rework to enqueue in pump worker from encoded queue")
Cc: stable <stable@kernel.org>
Cc: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lore.kernel.org/r/20250212135514.30539-1-frederic@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/function/uvc_video.c b/drivers/usb/gadget/function/uvc_video.c
index 79e223713d8b..fb77b0b21790 100644
--- a/drivers/usb/gadget/function/uvc_video.c
+++ b/drivers/usb/gadget/function/uvc_video.c
@@ -818,7 +818,7 @@ int uvcg_video_init(struct uvc_video *video, struct uvc_device *uvc)
 		return -EINVAL;
 
 	/* Allocate a kthread for asynchronous hw submit handler. */
-	video->kworker = kthread_create_worker(0, "UVCG");
+	video->kworker = kthread_run_worker(0, "UVCG");
 	if (IS_ERR(video->kworker)) {
 		uvcg_err(&video->uvc->func, "failed to create UVCG kworker\n");
 		return PTR_ERR(video->kworker);