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| author |   Hans Verkuil <hans.verkuil@cisco.com> | 2018-05-21 04:54:28 -0400 |
|---|---|---|
| committer |   Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2018-08-31 11:06:24 -0400 |
| commit | be9d6d4b0bf9cc3644826fb95264dbddb9a6d047 (patch) | |
| tree | f064a8189514f438514e118b6c22c1bcfd6aee56 | |
| parent | media: doc: Add media-request.h header to documentation build (diff) | |
| download | linux-dev-be9d6d4b0bf9cc3644826fb95264dbddb9a6d047.tar.xz linux-dev-be9d6d4b0bf9cc3644826fb95264dbddb9a6d047.zip | |
media: media-request: add media_request_get_by_fd
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>
| -rw-r--r-- | include/media/media-request.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/include/media/media-request.h b/include/media/media-request.h index 9664ebac5dc4..1c3e5d804d07 100644 --- a/include/media/media-request.h +++ b/include/media/media-request.h @@ -144,6 +144,24 @@ 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 * * @mdev: Media device this request belongs to @@ -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 /** |