[PATCH] dma-buf: revert "use inline lock for the dma-fence-chain"

["Christian König" <ckoenig.leichtzumerken@gmail.com>]

This reverts commit a408c0ca0c411ca1ead995bdae3112a806c87556.

This causes a lockdep splat. Not really the right fix, but changing this
is more work than expected.

Signed-off-by: Christian König <christian.koenig@amd.com>
---
 drivers/dma-buf/dma-fence-chain.c | 3 ++-
 include/linux/dma-fence-chain.h   | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/dma-buf/dma-fence-chain.c b/drivers/dma-buf/dma-fence-chain.c
index a707792b6025..a8a90acf4f34 100644
--- a/drivers/dma-buf/dma-fence-chain.c
+++ b/drivers/dma-buf/dma-fence-chain.c
@@ -245,6 +245,7 @@ void dma_fence_chain_init(struct dma_fence_chain *chain,
 	struct dma_fence_chain *prev_chain = to_dma_fence_chain(prev);
 	uint64_t context;
 
+	spin_lock_init(&chain->lock);
 	rcu_assign_pointer(chain->prev, prev);
 	chain->fence = fence;
 	chain->prev_seqno = 0;
@@ -260,7 +261,7 @@ void dma_fence_chain_init(struct dma_fence_chain *chain,
 			seqno = max(prev->seqno, seqno);
 	}
 
-	dma_fence_init64(&chain->base, &dma_fence_chain_ops, NULL,
+	dma_fence_init64(&chain->base, &dma_fence_chain_ops, &chain->lock,
 			 context, seqno);
 
 	/*
diff --git a/include/linux/dma-fence-chain.h b/include/linux/dma-fence-chain.h
index df3beadf1515..5cd3ba53b4a1 100644
--- a/include/linux/dma-fence-chain.h
+++ b/include/linux/dma-fence-chain.h
@@ -46,6 +46,7 @@ struct dma_fence_chain {
 		 */
 		struct irq_work work;
 	};
+	spinlock_t lock;
 };
 
 
-- 
2.43.0