[PATCH 1/5] usb: gadget: uvc: reset bytesused on queue cancel

[Michael Grzeschik <m.grzeschik@pengutronix.de>]

On uvcg_queue_cancel the buf_used counter has to be reset. Since the
encode function uses the variable to decide if the encoded data has
reached the end of frame. Intermediate calls of uvcg_queue_cancel can
therefor lead to miscalculations in the encode functions, if buf_used
was not properly reset.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
---
 drivers/usb/gadget/function/uvc_queue.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/gadget/function/uvc_queue.c b/drivers/usb/gadget/function/uvc_queue.c
index d852ac9e47e72c..cfa0ac4adb04d5 100644
--- a/drivers/usb/gadget/function/uvc_queue.c
+++ b/drivers/usb/gadget/function/uvc_queue.c
@@ -256,6 +256,8 @@ void uvcg_queue_cancel(struct uvc_video_queue *queue, int disconnect)
 	struct uvc_buffer *buf;
 	unsigned long flags;
 
+	queue->buf_used = 0;
+
 	spin_lock_irqsave(&queue->irqlock, flags);
 	while (!list_empty(&queue->irqqueue)) {
 		buf = list_first_entry(&queue->irqqueue, struct uvc_buffer,
-- 
2.30.2