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| author | Hans Verkuil <hverkuil-cisco@xs4all.nl> | 2020-02-20 10:34:26 +0100 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2020-03-02 15:27:25 +0100 |
| commit | 1583c793af736c8d33bf4aa6054ddc5c86e5a6c7 (patch) | |
| tree | cf34d4979876b3405f6f789f3317b5e7e6beaad5 /include/media | |
| parent | 6af5bcd37969b3bac4d851ea01362b9c01fec5bb (diff) | |
| download | linux-1583c793af736c8d33bf4aa6054ddc5c86e5a6c7.tar.bz2 | |
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>
Diffstat (limited to 'include/media')
| -rw-r--r-- | include/media/videobuf2-core.h | 7 |
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. |