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dma-buf: Warn about dma_fence_chain container rules v2 

Chaining of dma_fence_chain objects is only allowed through the prev
fence and not through the contained fence.

Warn about that when we create a dma_fence_chain.

v2: fix comment style

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220204100429.2049-4-christian.koenig@amd.com
This commit is contained in:
Christian König 2022-01-19 14:37:41 +01:00
parent 0fd9803b98
commit 270b48bb8d
1 changed files with 9 additions and 0 deletions
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9
drivers/dma-buf/dma-fence-chain.c
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@ -254,5 +254,14 @@ void dma_fence_chain_init(struct dma_fence_chain *chain,
dma_fence_init(&chain->base, &dma_fence_chain_ops,
&chain->lock, context, seqno);
/*
* Chaining dma_fence_chain container together is only allowed through
* the prev fence and not through the contained fence.
*
* The correct way of handling this is to flatten out the fence
* structure into a dma_fence_array by the caller instead.
*/
WARN_ON(dma_fence_is_chain(fence));
}
EXPORT_SYMBOL(dma_fence_chain_init);