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authorHans Verkuil <hverkuil-cisco@xs4all.nl>2020-02-20 10:34:26 +0100
committerMauro Carvalho Chehab <mchehab+huawei@kernel.org>2020-03-02 15:27:25 +0100
commit1583c793af736c8d33bf4aa6054ddc5c86e5a6c7 (patch)
treecf34d4979876b3405f6f789f3317b5e7e6beaad5
parent6af5bcd37969b3bac4d851ea01362b9c01fec5bb (diff)
media: videobuf2-core.h: improve buf_struct_size documentation
Explicitly document that the driver-specific buffer structure must start with the subsystem-specific struct (vb2_v4l2_buffer in the case of V4L2). Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
-rw-r--r--include/media/videobuf2-core.h7
1 files changed, 5 insertions, 2 deletions
diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index a2b2208b02da..f11b96514cf7 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -509,8 +509,11 @@ struct vb2_buf_ops {
* by the vb2 core.
* @buf_struct_size: size of the driver-specific buffer structure;
* "0" indicates the driver doesn't want to use a custom buffer
- * structure type. for example, ``sizeof(struct vb2_v4l2_buffer)``
- * will be used for v4l2.
+ * structure type. In that case a subsystem-specific struct
+ * will be used (in the case of V4L2 that is
+ * ``sizeof(struct vb2_v4l2_buffer)``). The first field of the
+ * driver-specific buffer structure must be the subsystem-specific
+ * struct (vb2_v4l2_buffer in the case of V4L2).
* @timestamp_flags: Timestamp flags; ``V4L2_BUF_FLAG_TIMESTAMP_*`` and
* ``V4L2_BUF_FLAG_TSTAMP_SRC_*``
* @gfp_flags: additional gfp flags used when allocating the buffers.

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