Fence signaling must be enabled to make sure that the dma_fence_is_signaled() function ever returns true. Since drivers and implementations sometimes mess this up, this ensures correct behaviour when DEBUG_WW_MUTEX_SLOWPATH is used during debugging. This should make any implementation bugs resulting in not signaled fences much more obvious.
Arvind Yadav (6): [PATCH v3 1/6] dma-buf: Remove the signaled bit status check [PATCH v3 2/6] dma-buf: set signaling bit for the stub fence [PATCH v3 3/6] dma-buf: Enable signaling on fence for selftests [PATCH v3 4/6] drm/amdgpu: Enable signaling on fence. [PATCH v3 5/6] drm/sched: Use parent fence instead of finished [PATCH v3 6/6] dma-buf: Check status of enable-signaling bit on debug drivers/dma-buf/dma-fence.c | 7 ++++--- drivers/dma-buf/st-dma-fence-chain.c | 4 ++++ drivers/dma-buf/st-dma-fence-unwrap.c | 22 ++++++++++++++++++++++ drivers/dma-buf/st-dma-fence.c | 16 ++++++++++++++++ drivers/dma-buf/st-dma-resv.c | 10 ++++++++++ drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c | 2 ++ drivers/gpu/drm/scheduler/sched_main.c | 4 ++-- include/linux/dma-fence.h | 5 +++++ 8 files changed, 65 insertions(+), 5 deletions(-) -- 2.25.1
