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media: media-request: add media_request_get_by_fd

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Add media_request_get_by_fd() to find a request based on the file
descriptor.

The caller has to call media_request_put() for the returned
request since this function increments the refcount.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Hans Verkuil 2018-05-21 04:54:28 -04:00 committed by Mauro Carvalho Chehab
parent 496f6f4d8a
commit be9d6d4b0b
1 changed files with 24 additions and 0 deletions
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24
include/media/media-request.h
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@ -143,6 +143,24 @@ static inline void media_request_get(struct media_request *req)
*/
void media_request_put(struct media_request *req);
/**
* media_request_get_by_fd - Get a media request by fd
*
* @mdev: Media device this request belongs to
* @request_fd: The file descriptor of the request
*
* Get the request represented by @request_fd that is owned
* by the media device.
*
* Return a -EPERM error pointer if requests are not supported
* by this driver. Return -ENOENT 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
* request.
*/
struct media_request *
media_request_get_by_fd(struct media_device *mdev, int request_fd);
/**
* media_request_alloc - Allocate the media request
*
@ -164,6 +182,12 @@ 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(-EPERM);
}
#endif
/**