From a9cdbed5a287f9ac6458976e1fe81c191bd2c7de Mon Sep 17 00:00:00 2001
From: Rob Clark <robdclark@chromium.org>
Date: Thu, 15 Dec 2022 11:14:58 -0800
Subject: [PATCH] freedreno/drm: Short-circuit kernel for timeout=0 waits

We already know from the userspace fence whether the fence has signaled
or not.  No need to do a syscall if we aren't going to wait.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20263>
---
 src/freedreno/drm/freedreno_pipe.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/freedreno/drm/freedreno_pipe.c b/src/freedreno/drm/freedreno_pipe.c
index b81b2907c77..75b16d8df17 100644
--- a/src/freedreno/drm/freedreno_pipe.c
+++ b/src/freedreno/drm/freedreno_pipe.c
@@ -192,6 +192,9 @@ fd_pipe_wait_timeout(struct fd_pipe *pipe, const struct fd_fence *fence,
    if (!fd_fence_after(fence->ufence, pipe->control->fence))
       return 0;
 
+   if (!timeout)
+      return -ETIMEDOUT;
+
    fd_pipe_flush(pipe, fence->ufence);
 
    return pipe->funcs->wait(pipe, fence, timeout);