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authorAnton Leontiev <bunder@t-25.ru>2014-03-25 04:40:57 (GMT)
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2014-05-09 12:10:36 (GMT)
commit780fa424e385f3459dc6baefdfc594b794e4effe (patch)
tree30b8d75e738fe8f27ec62445cf27f098be2e0932
parent393cbd8dc532c1ebed60719da8d379f50d445f28 (diff)
uvcvideo: Fix marking buffer erroneous in case of FID toggling
Set error bit for incomplete buffers when end of buffer is detected by FID toggling (for example when last transaction with EOF is lost). This prevents passing incomplete buffers to the userspace. Signed-off-by: Anton Leontiev <bunder@t-25.ru> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
-rw-r--r--drivers/media/usb/uvc/uvc_video.c21
1 files changed, 15 insertions, 6 deletions
diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
index 8d52baf..ca205ee 100644
--- a/drivers/media/usb/uvc/uvc_video.c
+++ b/drivers/media/usb/uvc/uvc_video.c
@@ -1133,6 +1133,17 @@ static int uvc_video_encode_data(struct uvc_streaming *stream,
*/
/*
+ * Set error flag for incomplete buffer.
+ */
+static void uvc_video_validate_buffer(const struct uvc_streaming *stream,
+ struct uvc_buffer *buf)
+{
+ if (buf->length != buf->bytesused &&
+ !(stream->cur_format->flags & UVC_FMT_FLAG_COMPRESSED))
+ buf->error = 1;
+}
+
+/*
* Completion handler for video URBs.
*/
static void uvc_video_decode_isoc(struct urb *urb, struct uvc_streaming *stream,
@@ -1156,9 +1167,11 @@ static void uvc_video_decode_isoc(struct urb *urb, struct uvc_streaming *stream,
do {
ret = uvc_video_decode_start(stream, buf, mem,
urb->iso_frame_desc[i].actual_length);
- if (ret == -EAGAIN)
+ if (ret == -EAGAIN) {
+ uvc_video_validate_buffer(stream, buf);
buf = uvc_queue_next_buffer(&stream->queue,
buf);
+ }
} while (ret == -EAGAIN);
if (ret < 0)
@@ -1173,11 +1186,7 @@ static void uvc_video_decode_isoc(struct urb *urb, struct uvc_streaming *stream,
urb->iso_frame_desc[i].actual_length);
if (buf->state == UVC_BUF_STATE_READY) {
- if (buf->length != buf->bytesused &&
- !(stream->cur_format->flags &
- UVC_FMT_FLAG_COMPRESSED))
- buf->error = 1;
-
+ uvc_video_validate_buffer(stream, buf);
buf = uvc_queue_next_buffer(&stream->queue, buf);
}
}

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