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dma-buf: add dma_fence_chain_alloc/free v3

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Add a common allocation helper. Cleaning up the mix of kzalloc/kmalloc
and some unused code in the selftest.

v2: polish kernel doc a bit
v3: polish kernel doc even a bit more

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210611120301.10595-3-christian.koenig@amd.com
This commit is contained in:
Christian König
2021-05-05 13:38:12 +02:00
parent 9c61e78954
commit 440d0f12b5
6 changed files with 38 additions and 25 deletions
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25
include/linux/dma-fence-chain.h
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@@ -12,6 +12,7 @@
#include <linux/dma-fence.h>
#include <linux/irq_work.h>
#include <linux/slab.h>
/**
* struct dma_fence_chain - fence to represent an node of a fence chain
@@ -66,6 +67,30 @@ to_dma_fence_chain(struct dma_fence *fence)
return container_of(fence, struct dma_fence_chain, base);
}
/**
* dma_fence_chain_alloc
*
* Returns a new struct dma_fence_chain object or NULL on failure.
*/
static inline struct dma_fence_chain *dma_fence_chain_alloc(void)
{
return kmalloc(sizeof(struct dma_fence_chain), GFP_KERNEL);
};
/**
* dma_fence_chain_free
* @chain: chain node to free
*
* Frees up an allocated but not used struct dma_fence_chain object. This
* doesn't need an RCU grace period since the fence was never initialized nor
* published. After dma_fence_chain_init() has been called the fence must be
* released by calling dma_fence_put(), and not through this function.
*/
static inline void dma_fence_chain_free(struct dma_fence_chain *chain)
{
kfree(chain);
};
/**
* dma_fence_chain_for_each - iterate over all fences in chain
* @iter: current fence