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dma-buf/sync_file: add sync_file_get_fence() 

Creates a function that given an sync file descriptor returns a
fence containing all fences in the sync_file.

v2: Comments by Daniel Vetter
	- Adapt to new version of fence_collection_init()
	- Hold a reference for the fence we return

v3:
	- Adapt to use fput() directly
	- rename to sync_file_get_fence() as we always return one fence

v4: Adapt to use fence_array

v5: set fence through fence_get()

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
This commit is contained in:
Gustavo Padovan 2016-08-05 10:39:36 -03:00 committed by Sumit Semwal
parent a02b9dc90d
commit 972526a409
2 changed files with 24 additions and 0 deletions
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23
drivers/dma-buf/sync_file.c
View File

@ -116,6 +116,29 @@ static struct sync_file *sync_file_fdget(int fd)
return NULL;
}
/**
* sync_file_get_fence - get the fence related to the sync_file fd
* @fd: sync_file fd to get the fence from
*
* Ensures @fd references a valid sync_file and returns a fence that
* represents all fence in the sync_file. On error NULL is returned.
*/
struct fence *sync_file_get_fence(int fd)
{
struct sync_file *sync_file;
struct fence *fence;
sync_file = sync_file_fdget(fd);
if (!sync_file)
return NULL;
fence = fence_get(sync_file->fence);
fput(sync_file->file);
return fence;
}
EXPORT_SYMBOL(sync_file_get_fence);
static int sync_file_set_fence(struct sync_file *sync_file,
struct fence **fences, int num_fences)
{

1
include/linux/sync_file.h
View File

@ -46,5 +46,6 @@ struct sync_file {
};
struct sync_file *sync_file_create(struct fence *fence);
struct fence *sync_file_get_fence(int fd);
#endif /* _LINUX_SYNC_H */