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Subject: [media] uvcvideo: Reset the bytesused field when recycling an 
erroneous buffer
Author:  Jayakrishnan Memana <[email protected]>
Date:    Sun Jul 15 10:54:03 2012 -0300

Buffers marked as erroneous are recycled immediately by the driver if
the nodrop module parameter isn't set. The buffer payload size is reset
to 0, but the buffer bytesused field isn't. This results in the buffer
being immediately considered as complete, leading to an infinite loop in
interrupt context.

Fix the problem by resetting the bytesused field when recycling the
buffer.

Cc: <[email protected]>
Signed-off-by: Jayakrishnan Memana <[email protected]>
Signed-off-by: Laurent Pinchart <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>

 drivers/media/video/uvc/uvc_queue.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

---

http://git.linuxtv.org/media_tree.git?a=commitdiff;h=8a3f0ede2b3f5477122060af1a816c6bbf09fcd2

diff --git a/drivers/media/video/uvc/uvc_queue.c 
b/drivers/media/video/uvc/uvc_queue.c
index 9288fbd..5577381 100644
--- a/drivers/media/video/uvc/uvc_queue.c
+++ b/drivers/media/video/uvc/uvc_queue.c
@@ -338,6 +338,7 @@ struct uvc_buffer *uvc_queue_next_buffer(struct 
uvc_video_queue *queue,
        if ((queue->flags & UVC_QUEUE_DROP_CORRUPTED) && buf->error) {
                buf->error = 0;
                buf->state = UVC_BUF_STATE_QUEUED;
+               buf->bytesused = 0;
                vb2_set_plane_payload(&buf->buf, 0, 0);
                return buf;
        }
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