diff options
Diffstat (limited to 'include/linux/dma-fence-chain.h')
| -rw-r--r-- | include/linux/dma-fence-chain.h | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/include/linux/dma-fence-chain.h b/include/linux/dma-fence-chain.h index 54fe3443fd2c..4bdf0b96da28 100644 --- a/include/linux/dma-fence-chain.h +++ b/include/linux/dma-fence-chain.h @@ -49,7 +49,6 @@ struct dma_fence_chain { spinlock_t lock; }; -extern const struct dma_fence_ops dma_fence_chain_ops; /** * to_dma_fence_chain - cast a fence to a dma_fence_chain @@ -61,13 +60,28 @@ extern const struct dma_fence_ops dma_fence_chain_ops; static inline struct dma_fence_chain * to_dma_fence_chain(struct dma_fence *fence) { - if (!fence || fence->ops != &dma_fence_chain_ops) + if (!fence || !dma_fence_is_chain(fence)) return NULL; return container_of(fence, struct dma_fence_chain, base); } /** + * dma_fence_chain_contained - return the contained fence + * @fence: the fence to test + * + * If the fence is a dma_fence_chain the function returns the fence contained + * inside the chain object, otherwise it returns the fence itself. + */ +static inline struct dma_fence * +dma_fence_chain_contained(struct dma_fence *fence) +{ + struct dma_fence_chain *chain = to_dma_fence_chain(fence); + + return chain ? chain->fence : fence; +} + +/** * dma_fence_chain_alloc * * Returns a new struct dma_fence_chain object or NULL on failure. @@ -98,6 +112,8 @@ static inline void dma_fence_chain_free(struct dma_fence_chain *chain) * * Iterate over all fences in the chain. We keep a reference to the current * fence while inside the loop which must be dropped when breaking out. + * + * For a deep dive iterator see dma_fence_unwrap_for_each(). */ #define dma_fence_chain_for_each(iter, head) \ for (iter = dma_fence_get(head); iter; \ |