[PATCH 5/6] dma-buf: Prettify typecasts for dma-fence-chain

Venkata Sandeep Dhanalakota venkata.s.dhanalakota at intel.com
Wed Apr 1 05:07:29 UTC 2020

From: Chris Wilson <chris at chris-wilson.co.uk>

Inside dma-fence-chain, we use a cmpxchg on an RCU-protected pointer. To
avoid the sparse warning for using the RCU pointer directly, we have to
cast away the __rcu annotation. However, we don't need to use void*
everywhere and can stick to the dma_fence*.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
 drivers/dma-buf/dma-fence-chain.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/dma-buf/dma-fence-chain.c b/drivers/dma-buf/dma-fence-chain.c
index 44a741677d25..3d123502ff12 100644
--- a/drivers/dma-buf/dma-fence-chain.c
+++ b/drivers/dma-buf/dma-fence-chain.c
@@ -62,7 +62,8 @@ struct dma_fence *dma_fence_chain_walk(struct dma_fence *fence)
 			replacement = NULL;
-		tmp = cmpxchg((void **)&chain->prev, (void *)prev, (void *)replacement);
+		tmp = cmpxchg((struct dma_fence __force **)&chain->prev,
+			      prev, replacement);
 		if (tmp == prev)

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