Commit 270b48bb authored by Christian König's avatar Christian König
Browse files

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: default avatarChristian König <christian.koenig@amd.com>
Reviewed-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: default avatarThomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220204100429.2049-4-christian.koenig@amd.com
parent 0fd9803b

drivers/dma-buf/dma-fence-chain.c

+9 −0
Original line number Diff line number Diff line
@@ -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);