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 <[email protected]>
Closes: https://lore.kernel.org/oe-lkp/[email protected]
Fixes: f0bbfbd ("usb: gadget: uvc: rework to enqueue in pump worker from encoded queue")
Cc: stable <[email protected]>
Cc: Michael Grzeschik <[email protected]>
Signed-off-by: Frederic Weisbecker <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Frederic Weisbecker

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);