Mikko Perttunen 4207a59049 gpu: host1x: Don't rely on dma_fence_wait_timeout return value ...

dma_fence_wait_timeout (along with a host of other jiffies-based
timeouting functions) returns zero both in case of timeout and when
the wait completes during the last jiffy before timeout. As such,
we can't rely on it to distinguish between success and timeout.

To prevent confusing callers by returning -EAGAIN before the timeout
period has elapsed, check if the fence got signaled again after
the wait.

Bug 3955201

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Change-Id: Ib90cbd3d78bac773a724a523925ae5d1b70107c8
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2857405
Reviewed-by: Jonathan Hunter <jonathanh@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>

2023-04-03 12:36:26 +00:00

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