From: Gustavo Padovan gustavo.padovan@collabora.co.uk
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
Signed-off-by: Gustavo Padovan gustavo.padovan@collabora.co.uk --- drivers/dma-buf/sync_file.c | 24 ++++++++++++++++++++++++ include/linux/sync_file.h | 1 + 2 files changed, 25 insertions(+)
diff --git a/drivers/dma-buf/sync_file.c b/drivers/dma-buf/sync_file.c index 12dbf17..3ffaea8 100644 --- a/drivers/dma-buf/sync_file.c +++ b/drivers/dma-buf/sync_file.c @@ -116,6 +116,30 @@ err: 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 = sync_file->fence; + fence_get(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) { diff --git a/include/linux/sync_file.h b/include/linux/sync_file.h index 2efc5ec..f7de5a0 100644 --- a/include/linux/sync_file.h +++ b/include/linux/sync_file.h @@ -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 */