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authorHans Verkuil <hans.verkuil@cisco.com>2014-04-07 09:20:39 -0300
committerMauro Carvalho Chehab <m.chehab@samsung.com>2014-04-16 18:46:35 -0300
commite35e41b57624b9a8c0014420cdfb24454e4773c5 (patch)
tree6e00a462572fd2aaf9575fd7dadbead65a0b5541
parentebd7c50510f4b56285bb9fb4ba56a501c9c8f7df (diff)
[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>
-rw-r--r--drivers/media/v4l2-core/videobuf2-core.c13
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;

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