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media: media requests: return EBADR instead of EACCES

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If requests are used when they shouldn't, or not used when they should,
then return EBADR (Invalid request descriptor) instead of EACCES.

The reason for this change is that EACCES has more to do with permissions
(not being the owner of the resource), but in this case the request file
descriptor is just wrong for the current mode of the device.

Update the documentation accordingly.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Hans Verkuil 2019-03-20 10:31:18 -04:00 committed by Mauro Carvalho Chehab
parent ca0d1bd489
commit e79c7159d4
6 changed files with 12 additions and 14 deletions
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2
Documentation/media/uapi/mediactl/request-api.rst
View File

@ -93,7 +93,7 @@ A queued request cannot be modified anymore.
.. caution::
For :ref:`memory-to-memory devices <mem2mem>` you can use requests only for
output buffers, not for capture buffers. Attempting to add a capture buffer
to a request will result in an ``EACCES`` error.
to a request will result in an ``EBADR`` error.
If the request contains configurations for multiple entities, individual drivers
may synchronize so the requested pipeline's topology is applied before the

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

@ -326,7 +326,7 @@ struct v4l2_buffer
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 ``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.

12
Documentation/media/uapi/v4l/vidioc-qbuf.rst
View File

@ -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.
@ -125,7 +125,7 @@ then ``EINVAL`` will be returned.
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
@ -185,12 +185,10 @@ EPIPE
codecs if a buffer with the ``V4L2_BUF_FLAG_LAST`` was already
dequeued and no new buffers are expected to become available.
EACCES
The ``V4L2_BUF_FLAG_REQUEST_FD`` flag was set but the device does not
support requests for the given buffer type.
EBADR
The ``V4L2_BUF_FLAG_REQUEST_FD`` flag was not set but the device requires
The ``V4L2_BUF_FLAG_REQUEST_FD`` flag was set but the device does not
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

2
drivers/media/common/videobuf2/videobuf2-v4l2.c
View File

@ -392,7 +392,7 @@ static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct media_device *md
return 0;
} else if (!q->supports_requests) {
dprintk(1, "%s: queue does not support requests\n", opname);
return -EACCES;
return -EBADR;
} else if (q->uses_qbuf) {
dprintk(1, "%s: queue does not use requests\n", opname);
return -EBUSY;

4
drivers/media/media-request.c
View File

@ -251,7 +251,7 @@ media_request_get_by_fd(struct media_device *mdev, int request_fd)
if (!mdev || !mdev->ops ||
!mdev->ops->req_validate || !mdev->ops->req_queue)
return ERR_PTR(-EACCES);
return ERR_PTR(-EBADR);
filp = fget(request_fd);
if (!filp)
@ -407,7 +407,7 @@ int media_request_object_bind(struct media_request *req,
int ret = -EBUSY;
if (WARN_ON(!ops->release))
return -EACCES;
return -EBADR;
spin_lock_irqsave(&req->lock, flags);

4
include/media/media-request.h
View File

@ -198,7 +198,7 @@ void media_request_put(struct media_request *req);
* Get the request represented by @request_fd that is owned
* by the media device.
*
* Return a -EACCES error pointer if requests are not supported
* Return a -EBADR error pointer if requests are not supported
* by this driver. Return -EINVAL if the request was not found.
* Return the pointer to the request if found: the caller will
* have to call @media_request_put when it finished using the
@ -231,7 +231,7 @@ static inline void media_request_put(struct media_request *req)
static inline struct media_request *
media_request_get_by_fd(struct media_device *mdev, int request_fd)
{
return ERR_PTR(-EACCES);
return ERR_PTR(-EBADR);
}
#endif