On 1/24/22 14:03, Christian König wrote:
It's a reoccurring pattern that we need to extract the fence
from a dma_fence_chain object. Add a helper for this.
Signed-off-by: Christian König <christian.koenig@xxxxxxx>
Reviewed-by: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
---
drivers/dma-buf/dma-fence-chain.c | 6 ++----
include/linux/dma-fence-chain.h | 15 +++++++++++++++
2 files changed, 17 insertions(+), 4 deletions(-)
diff --git a/drivers/dma-buf/dma-fence-chain.c b/drivers/dma-buf/dma-fence-chain.c
index 084c6927b735..06f8ef97c6e8 100644
--- a/drivers/dma-buf/dma-fence-chain.c
+++ b/drivers/dma-buf/dma-fence-chain.c
@@ -148,8 +148,7 @@ static bool dma_fence_chain_enable_signaling(struct dma_fence *fence)
dma_fence_get(&head->base);
dma_fence_chain_for_each(fence, &head->base) {
- struct dma_fence_chain *chain = to_dma_fence_chain(fence);
- struct dma_fence *f = chain ? chain->fence : fence;
+ struct dma_fence *f = dma_fence_chain_contained(fence);
dma_fence_get(f);
if (!dma_fence_add_callback(f, &head->cb, dma_fence_chain_cb)) {
@@ -165,8 +164,7 @@ static bool dma_fence_chain_enable_signaling(struct dma_fence *fence)
static bool dma_fence_chain_signaled(struct dma_fence *fence)
{
dma_fence_chain_for_each(fence, fence) {
- struct dma_fence_chain *chain = to_dma_fence_chain(fence);
- struct dma_fence *f = chain ? chain->fence : fence;
+ struct dma_fence *f = dma_fence_chain_contained(fence);
if (!dma_fence_is_signaled(f)) {
dma_fence_put(fence);
diff --git a/include/linux/dma-fence-chain.h b/include/linux/dma-fence-chain.h
index ee906b659694..10d51bcdf7b7 100644
--- a/include/linux/dma-fence-chain.h
+++ b/include/linux/dma-fence-chain.h
@@ -66,6 +66,21 @@ to_dma_fence_chain(struct dma_fence *fence)
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
*
