On 2016年10月17日 21:55, Christian König wrote:
From: Christian König <christian.koenig@xxxxxxx>
Kernel functions taking a timeout usually return 1 on success even
when they get a zero timeout.
Signen-off-by: Christian König <christian.koenig@xxxxxxx>
The series is Reviewed-by: Chunming Zhou <david1.zhou@xxxxxxx>
---
drivers/dma-buf/fence.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/dma-buf/fence.c b/drivers/dma-buf/fence.c
index 4d51f9e..fb915ab 100644
--- a/drivers/dma-buf/fence.c
+++ b/drivers/dma-buf/fence.c
@@ -335,18 +335,20 @@ fence_default_wait_cb(struct fence *fence, struct 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
fence_default_wait(struct 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(FENCE_FLAG_SIGNALED_BIT, &fence->flags))
- return timeout;
+ return ret;
spin_lock_irqsave(fence->lock, flags);
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