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| author | Hans Verkuil <hans.verkuil@cisco.com> | 2014-04-07 16:20:39 +0400 |
|---|---|---|
| committer | Mauro Carvalho Chehab <m.chehab@samsung.com> | 2014-04-17 01:46:35 +0400 |
| commit | e35e41b57624b9a8c0014420cdfb24454e4773c5 (patch) | |
| tree | 6e00a462572fd2aaf9575fd7dadbead65a0b5541 /drivers/media/v4l2-core/videobuf2-core.c | |
| parent | ebd7c50510f4b56285bb9fb4ba56a501c9c8f7df (diff) | |
| download | linux-e35e41b57624b9a8c0014420cdfb24454e4773c5.tar.xz | |
[media] vb2: reject output buffers with V4L2_FIELD_ALTERNATE
This is not allowed by the spec and does in fact not make any sense.
Return -EINVAL if this is the case.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Pawel Osciak <pawel@osciak.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'drivers/media/v4l2-core/videobuf2-core.c')
| -rw-r--r-- | drivers/media/v4l2-core/videobuf2-core.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c index 07ab0677e259..2eef5ef93e93 100644 --- a/drivers/media/v4l2-core/videobuf2-core.c +++ b/drivers/media/v4l2-core/videobuf2-core.c @@ -1564,6 +1564,19 @@ static int __buf_prepare(struct vb2_buffer *vb, const struct v4l2_buffer *b) dprintk(1, "plane parameters verification failed: %d\n", ret); return ret; } + if (b->field == V4L2_FIELD_ALTERNATE && V4L2_TYPE_IS_OUTPUT(q->type)) { + /* + * If the format's field is ALTERNATE, then the buffer's field + * should be either TOP or BOTTOM, not ALTERNATE since that + * makes no sense. The driver has to know whether the + * buffer represents a top or a bottom field in order to + * program any DMA correctly. Using ALTERNATE is wrong, since + * that just says that it is either a top or a bottom field, + * but not which of the two it is. + */ + dprintk(1, "the field is incorrectly set to ALTERNATE for an output buffer\n"); + return -EINVAL; + } vb->state = VB2_BUF_STATE_PREPARING; vb->v4l2_buf.timestamp.tv_sec = 0; |