diff options
Diffstat (limited to 'Documentation/media/uapi/v4l/vidioc-qbuf.rst')
| -rw-r--r-- | Documentation/media/uapi/v4l/vidioc-qbuf.rst | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/Documentation/media/uapi/v4l/vidioc-qbuf.rst b/Documentation/media/uapi/v4l/vidioc-qbuf.rst index 3259168a7358..dbf7b445a27b 100644 --- a/Documentation/media/uapi/v4l/vidioc-qbuf.rst +++ b/Documentation/media/uapi/v4l/vidioc-qbuf.rst @@ -111,7 +111,7 @@ in use. Setting it means that the buffer will not be passed to the driver until the request itself is queued. Also, the driver will apply any settings associated with the request for this buffer. This field will be ignored unless the ``V4L2_BUF_FLAG_REQUEST_FD`` flag is set. -If the device does not support requests, then ``EACCES`` will be returned. +If the device does not support requests, then ``EBADR`` will be returned. If requests are supported but an invalid request file descriptor is given, then ``EINVAL`` will be returned. @@ -123,9 +123,9 @@ then ``EINVAL`` will be returned. :ref:`VIDIOC_STREAMOFF <VIDIOC_STREAMON>` or calling :ref:`VIDIOC_REQBUFS` the check for this will be reset. - For :ref:`memory-to-memory devices <codec>` you can specify the + For :ref:`memory-to-memory devices <mem2mem>` you can specify the ``request_fd`` only for output buffers, not for capture buffers. Attempting - to specify this for a capture buffer will result in an ``EACCES`` error. + to specify this for a capture buffer will result in an ``EBADR`` error. Applications call the ``VIDIOC_DQBUF`` ioctl to dequeue a filled (capturing) or displayed (output) buffer from the driver's outgoing @@ -185,9 +185,11 @@ EPIPE codecs if a buffer with the ``V4L2_BUF_FLAG_LAST`` was already dequeued and no new buffers are expected to become available. -EACCES +EBADR The ``V4L2_BUF_FLAG_REQUEST_FD`` flag was set but the device does not - support requests for the given buffer type. + support requests for the given buffer type, or + the ``V4L2_BUF_FLAG_REQUEST_FD`` flag was not set but the device requires + that the buffer is part of a request. EBUSY The first buffer was queued via a request, but the application now tries |