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authorAlex Deucher <alexdeucher@gmail.com>2016-11-08 00:16:13 +0300
committerSumit Semwal <sumit.semwal@linaro.org>2016-11-08 22:15:14 +0300
commitbcc004b629d22ae202988e4c5424564e0b4f1217 (patch)
tree74daa7068485ec53de499fe73e45ebcd2087cb4f /drivers/dma-buf/dma-fence.c
parenteef18a827a9ec58aa9fc1ccfb7e65ff04ebc25f3 (diff)
downloadlinux-bcc004b629d22ae202988e4c5424564e0b4f1217.tar.xz
dma-buf/fence: make timeout handling in fence_default_wait consistent (v2)
Kernel functions taking a timeout usually return 1 on success even when they get a zero timeout. v2: agd: rebase on drm-next Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Chunming Zhou <david1.zhou@amd.com> Reviewed-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org> Link: http://patchwork.freedesktop.org/patch/msgid/1478553376-18575-1-git-send-email-alexander.deucher@amd.com
Diffstat (limited to 'drivers/dma-buf/dma-fence.c')
-rw-r--r--drivers/dma-buf/dma-fence.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c
index cda40cbd8c43..70f4fcc0bc03 100644
--- a/drivers/dma-buf/dma-fence.c
+++ b/drivers/dma-buf/dma-fence.c
@@ -339,18 +339,20 @@ dma_fence_default_wait_cb(struct dma_fence *fence, struct dma_fence_cb *cb)
* @timeout: [in] timeout value in jiffies, or MAX_SCHEDULE_TIMEOUT
*
* Returns -ERESTARTSYS if interrupted, 0 if the wait timed out, or the
- * remaining timeout in jiffies on success.
+ * remaining timeout in jiffies on success. If timeout is zero the value one is
+ * returned if the fence is already signaled for consistency with other
+ * functions taking a jiffies timeout.
*/
signed long
dma_fence_default_wait(struct dma_fence *fence, bool intr, signed long timeout)
{
struct default_wait_cb cb;
unsigned long flags;
- signed long ret = timeout;
+ signed long ret = timeout ? timeout : 1;
bool was_set;
if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags))
- return timeout;
+ return ret;
spin_lock_irqsave(fence->lock, flags);