drm/nouveau: base fence timeout on time of emission

Wait loop can be interrupted by signal, so if signals are raised
periodically (e.g. SIGALRM) this loop may never finish. Use
emission time as a base for fence timeout.
Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nouveau_fence.c

@@ -44,6 +44,7 @@ struct nouveau_fence {
 
 	uint32_t sequence;
 	bool signalled;
+	unsigned long timeout;
 
 	void (*work)(void *priv, bool signalled);
 	void *priv;
@@ -172,6 +173,7 @@ nouveau_fence_emit(struct nouveau_fence *fence)
 	}
 	OUT_RING (chan, fence->sequence);
 	FIRE_RING(chan);
+	fence->timeout = jiffies + 3 * DRM_HZ;
 
 	return 0;
 }
@@ -230,7 +232,8 @@ __nouveau_fence_signalled(void *sync_obj, void *sync_arg)
 int
 __nouveau_fence_wait(void *sync_obj, void *sync_arg, bool lazy, bool intr)
 {
-	unsigned long timeout = jiffies + (3 * DRM_HZ);
+	struct nouveau_fence *fence = nouveau_fence(sync_obj);
+	unsigned long timeout = fence->timeout;
 	unsigned long sleep_time = NSEC_PER_MSEC / 1000;
 	ktime_t t;
 	int ret = 0;