From: Ezequiel Garcia <[email protected]>
The driver should only set the payload on .buf_prepare if the
buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
set by userspace then v4l2-core will set it to buffer length.
Fixes: cd33c830448ba ("media: rkvdec: Add the rkvdec driver")
Signed-off-by: Ezequiel Garcia <[email protected]>
Signed-off-by: Adrian Ratiu <[email protected]>
Signed-off-by: Andrzej Pietrasiewicz <[email protected]>
---
drivers/staging/media/rkvdec/rkvdec.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/staging/media/rkvdec/rkvdec.c
b/drivers/staging/media/rkvdec/rkvdec.c
index d821661d30f3..ef2166043127 100644
--- a/drivers/staging/media/rkvdec/rkvdec.c
+++ b/drivers/staging/media/rkvdec/rkvdec.c
@@ -481,7 +481,15 @@ static int rkvdec_buf_prepare(struct vb2_buffer *vb)
if (vb2_plane_size(vb, i) < sizeimage)
return -EINVAL;
}
- vb2_set_plane_payload(vb, 0, f->fmt.pix_mp.plane_fmt[0].sizeimage);
+
+ /*
+ * Buffer bytesused is written by driver for CAPTURE buffers.
+ * (if userspace passes 0 bytesused for OUTPUT buffers, v4l2-core sets
+ * it to buffer length).
+ */
+ if (!V4L2_TYPE_IS_OUTPUT(vq->type))
+ vb2_set_plane_payload(vb, 0,
f->fmt.pix_mp.plane_fmt[0].sizeimage);
+
return 0;
}
--
2.17.1
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