The patch below does not apply to the 3.11-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 6ee0faa52676ab648e486afb654fc92313d55943 Mon Sep 17 00:00:00 2001
From: Lubomir Rintel <lkundrak@xxxxx>
Date: Tue, 2 Jul 2013 07:56:39 -0300
Subject: [PATCH] [media] usbtv: Throw corrupted frames away
Ignore out of order data and mark incomplete buffers as errored.
This gets rid of annoying flicker due to occassional garbage from hardware.
Signed-off-by: Lubomir Rintel <lkundrak@xxxxx>
Cc: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: linux-media@xxxxxxxxxxxxxxx
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@xxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
diff --git a/drivers/media/usb/usbtv/usbtv.c b/drivers/media/usb/usbtv/usbtv.c
index 55a45d34..8a505a90 100644
--- a/drivers/media/usb/usbtv/usbtv.c
+++ b/drivers/media/usb/usbtv/usbtv.c
@@ -88,6 +88,7 @@ struct usbtv {
/* Number of currently processed frame, useful find
* out when a new one begins. */
u32 frame_id;
+ int chunks_done;
enum {
USBTV_COMPOSITE_INPUT,
@@ -299,8 +300,13 @@ static void usbtv_image_chunk(struct usbtv *usbtv, u32 *chunk)
return;
/* Beginning of a frame. */
- if (chunk_no == 0)
+ if (chunk_no == 0) {
usbtv->frame_id = frame_id;
+ usbtv->chunks_done = 0;
+ }
+
+ if (usbtv->frame_id != frame_id)
+ return;
spin_lock_irqsave(&usbtv->buflock, flags);
if (list_empty(&usbtv->bufs)) {
@@ -315,16 +321,21 @@ static void usbtv_image_chunk(struct usbtv *usbtv, u32 *chunk)
/* Copy the chunk data. */
usbtv_chunk_to_vbuf(frame, &chunk[1], chunk_no, odd);
+ usbtv->chunks_done++;
/* Last chunk in a frame, signalling an end */
if (odd && chunk_no == USBTV_CHUNKS-1) {
int size = vb2_plane_size(&buf->vb, 0);
+ enum vb2_buffer_state state = usbtv->chunks_done ==
+ USBTV_CHUNKS ?
+ VB2_BUF_STATE_DONE :
+ VB2_BUF_STATE_ERROR;
buf->vb.v4l2_buf.field = V4L2_FIELD_INTERLACED;
buf->vb.v4l2_buf.sequence = usbtv->sequence++;
v4l2_get_timestamp(&buf->vb.v4l2_buf.timestamp);
vb2_set_plane_payload(&buf->vb, 0, size);
- vb2_buffer_done(&buf->vb, VB2_BUF_STATE_DONE);
+ vb2_buffer_done(&buf->vb, state);
list_del(&buf->list);
}
--
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