Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2025-01-01 15:51:46 +00:00
Code Issues Packages Projects Releases Wiki Activity

media: buffer.rst: only set V4L2_BUF_FLAG_REQUEST_FD for QBUF

Browse Source 
Document that V4L2_BUF_FLAG_REQUEST_FD should only be used with
VIDIOC_QBUF and cleared otherwise.

Signed-off-by: Hans Verkuil <hansverk@cisco.com>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Hans Verkuil 2018-08-23 06:45:09 -04:00 committed by Mauro Carvalho Chehab
parent b6b84557ec
commit dc58a553ba
1 changed files with 2 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/media/uapi/v4l/buffer.rst
View File

@ -312,6 +312,8 @@ struct v4l2_buffer
and flag ``V4L2_BUF_FLAG_REQUEST_FD`` is set, then the buffer will be
queued to that request. This is set by the user when calling
:ref:`ioctl VIDIOC_QBUF <VIDIOC_QBUF>` and ignored by other ioctls.
Applications should not set ``V4L2_BUF_FLAG_REQUEST_FD`` for any ioctls
other than :ref:`VIDIOC_QBUF <VIDIOC_QBUF>`.
If the device does not support requests, then ``EPERM`` will be returned.
If requests are supported but an invalid request file descriptor is
given, then ``EINVAL`` will be returned.