From: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Date: Tue, 24 May 2011 15:22:03 +0000 (-0300)
Subject: uvcvideo: Remove buffers from the queues when freeing
X-Git-Tag: v2.6.39.3~48
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5a17a780a4491afae243c6ac97381214d0fc3346;p=thirdparty%2Fkernel%2Fstable.git

uvcvideo: Remove buffers from the queues when freeing

commit 8ca2c80b170c47eeb55f0c2a0f2b8edf85f35d49 upstream.

When freeing memory for the video buffers also remove them from the
irq & main queues.

This fixes an oops when doing the following:

open ("/dev/video", ..)
VIDIOC_REQBUFS
VIDIOC_QBUF
VIDIOC_REQBUFS
close ()

As the second VIDIOC_REQBUFS will cause the list entries of the buffers
to be cleared while they still hang around on the main and irc queues

Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/media/video/uvc/uvc_queue.c b/drivers/media/video/uvc/uvc_queue.c
index f14581bd707f0..48c5c57cdb019 100644
--- a/drivers/media/video/uvc/uvc_queue.c
+++ b/drivers/media/video/uvc/uvc_queue.c
@@ -104,6 +104,8 @@ static int __uvc_free_buffers(struct uvc_video_queue *queue)
 	}
 
 	if (queue->count) {
+		uvc_queue_cancel(queue, 0);
+		INIT_LIST_HEAD(&queue->mainqueue);
 		vfree(queue->mem);
 		queue->count = 0;
 	}