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dma-buf: Don't misuse dma_fence_signal()
The return code of dma_fence_signal() is not really useful as there is nothing reasonable to do if a fence was already signaled. That return code shall be removed from the kernel. Moreover, dma_fence_signal() should not be used to check whether fences are signaled. That's what dma_fence_is_signaled() and dma_fence_test_signaled_flag() exist for. Replace the non-canonical usage of dma_fence_signal(). Suggested-by: Christian König <christian.koenig@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Philipp Stanner <phasta@kernel.org> Link: https://patch.msgid.link/20251201105011.19386-7-phasta@kernel.org
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