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dma-buf: add dma_fence_chain_contained helper 

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@amd.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220204100429.2049-6-christian.koenig@amd.com
This commit is contained in:
Christian König 2022-01-20 11:42:40 +01:00
parent 68129f431f
commit 18f5fad275
2 changed files with 17 additions and 4 deletions
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6
drivers/dma-buf/dma-fence-chain.c
View File

@ -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);

15
include/linux/dma-fence-chain.h
View File

@ -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
*