From fb8b7d2b9d80e1e71f379e57355936bd2b024be9 Mon Sep 17 00:00:00 2001 From: Jammy Zhou Date: Wed, 21 Jan 2015 18:35:47 +0800 Subject: reservation: wait only with non-zero timeout specified (v3) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit When the timeout value passed to reservation_object_wait_timeout_rcu is zero, no wait should be done if the fences are not signaled. Return '1' for idle and '0' for busy if the specified timeout is '0' to keep consistent with the case of non-zero timeout. v2: call fence_put if not signaled in the case of timeout==0 v3: switch to reservation_object_test_signaled_rcu Signed-off-by: Jammy Zhou Reviewed-by: Christian König Reviewed-by: Alex Deucher Reviewed-By: Maarten Lankhorst Signed-off-by: Sumit Semwal --- drivers/dma-buf/reservation.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers') diff --git a/drivers/dma-buf/reservation.c b/drivers/dma-buf/reservation.c index 3c97c8fa8d0..807ef155525 100644 --- a/drivers/dma-buf/reservation.c +++ b/drivers/dma-buf/reservation.c @@ -327,6 +327,9 @@ long reservation_object_wait_timeout_rcu(struct reservation_object *obj, unsigned seq, shared_count, i = 0; long ret = timeout; + if (!timeout) + return reservation_object_test_signaled_rcu(obj, wait_all); + retry: fence = NULL; shared_count = 0; -- cgit v1.2.3-70-g09d2 From 847b19a39e4c9b5e74c40f0842c48b41664cb43c Mon Sep 17 00:00:00 2001 From: Jammy Zhou Date: Wed, 21 Jan 2015 18:35:48 +0800 Subject: dma-buf/fence: don't wait when specified timeout is zero MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit When specified timeout is zero for fence_wait_timeout, just check if the fence is signaled or not without wait. Signed-off-by: Jammy Zhou Reviewed-by: Christian König Reviewed-By: Maarten Lankhorst Signed-off-by: Sumit Semwal --- drivers/dma-buf/fence.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers') diff --git a/drivers/dma-buf/fence.c b/drivers/dma-buf/fence.c index e5541117b3e..50ef8bd8708 100644 --- a/drivers/dma-buf/fence.c +++ b/drivers/dma-buf/fence.c @@ -159,6 +159,9 @@ fence_wait_timeout(struct fence *fence, bool intr, signed long timeout) if (WARN_ON(timeout < 0)) return -EINVAL; + if (timeout == 0) + return fence_is_signaled(fence); + trace_fence_wait_start(fence); ret = fence->ops->wait(fence, intr, timeout); trace_fence_wait_end(fence); -- cgit v1.2.3-70-g09d2 From 4eb2440ed60fb5793f7aa6da89b3d517cc59de43 Mon Sep 17 00:00:00 2001 From: Michel Dänzer Date: Thu, 22 Jan 2015 16:00:17 +0900 Subject: reservation: Remove shadowing local variable 'ret' MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit It was causing the return value of fence_is_signaled to be ignored, making reservation objects signal too early. Cc: stable@vger.kernel.org Reviewed-by: Maarten Lankhorst Reviewed-by: Alex Deucher Signed-off-by: Michel Dänzer Signed-off-by: Sumit Semwal --- drivers/dma-buf/reservation.c | 2 -- 1 file changed, 2 deletions(-) (limited to 'drivers') diff --git a/drivers/dma-buf/reservation.c b/drivers/dma-buf/reservation.c index 807ef155525..39920d77f28 100644 --- a/drivers/dma-buf/reservation.c +++ b/drivers/dma-buf/reservation.c @@ -405,8 +405,6 @@ reservation_object_test_signaled_single(struct fence *passed_fence) int ret = 1; if (!test_bit(FENCE_FLAG_SIGNALED_BIT, &lfence->flags)) { - int ret; - fence = fence_get_rcu(lfence); if (!fence) return -1; -- cgit v1.2.3-70-g09d2