From b9ef29d1be7bfb2fd6b59023792208e5028b95f0 Mon Sep 17 00:00:00 2001
From: Jack Xiao <Jack.Xiao@amd.com>
Date: Thu, 4 Jun 2015 10:41:24 +0800
Subject: [PATCH] amdgpu: add zero timeout check in
 amdgpu_cs_query_fence_status

Signed-off-by: Jack Xiao <Jack.Xiao@amd.com>
Reviewed-by: Jammy Zhou <Jammy.Zhou@amd.com>
---
 amdgpu/amdgpu_cs.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/amdgpu/amdgpu_cs.c b/amdgpu/amdgpu_cs.c
index a1e68f85..0fa05ece 100644
--- a/amdgpu/amdgpu_cs.c
+++ b/amdgpu/amdgpu_cs.c
@@ -396,6 +396,11 @@ int amdgpu_cs_query_fence_status(struct amdgpu_cs_query_fence *fence,
 		return 0;
 	}
 
+	if (fence->timeout_ns == 0) {
+		pthread_mutex_unlock(&context->sequence_mutex);
+		return 0;
+	}
+
 	pthread_mutex_unlock(&context->sequence_mutex);
 
 	r = amdgpu_ioctl_wait_cs(context, ip_type, ip_instance, ring,