media: uvcvideo: Flush the control cache when we get an event

jira LE-3622
Rebuild_History Non-Buildable kernel-6.12.0-55.22.1.el10_0
commit-author Ricardo Ribalda <ribalda@chromium.org>
commit d6b874f

Asynchronous controls trigger an event when they have completed their
operation.

This can make that the control cached value does not match the value in
the device.

Let's flush the cache to be on the safe side.

	Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
	Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/20241203-uvc-fix-async-v6-5-26c867231118@chromium.org
	Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
	Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
(cherry picked from commit d6b874f)
	Signed-off-by: Jonathan Maple <jmaple@ciq.com>

Author: PlaidCat

drivers/media/usb/uvc/uvc_ctrl.c

@@ -1622,6 +1622,9 @@ void uvc_ctrl_status_event(struct uvc_video_chain *chain,
 
 	mutex_lock(&chain->ctrl_mutex);
 
+	/* Flush the control cache, the data might have changed. */
+	ctrl->loaded = 0;
+
 	handle = ctrl->handle;
 	if (handle)
 		uvc_ctrl_set_handle(handle, ctrl, NULL);