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The semaphore dmabuf supplied in NVGPU_IOCTL_CHANNEL_WAIT is not necessarily always cache coherent with the GPU. Call dma_buf_begin_cpu_access() and dma_buf_end_cpu_access() around the sema read to make sure we see updated values after the interrupt. Jira NVGPU-5387 Bug 3028497 Change-Id: I09d23c8a679621c86bdfe609d454199e05fa2987 Signed-off-by: Konsta Hölttä <kholtta@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2359002 Reviewed-by: automaticguardword <automaticguardword@nvidia.com> Reviewed-by: Alex Waterman <alexw@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> GVS: Gerrit_Virtual_Submit Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>