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[media] vb2: reject output buffers with V4L2_FIELD_ALTERNATE

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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>
This commit is contained in:
Hans Verkuil 2014-04-07 09:20:39 -03:00 committed by Mauro Carvalho Chehab
parent ebd7c50510
commit e35e41b576
1 changed files with 13 additions and 0 deletions
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13
drivers/media/v4l2-core/videobuf2-core.c
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@ -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;