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From dc956dfc2832d5308ab23fa7f73b00aa55a1a8fb Mon Sep 17 00:00:00 2001
From: wentalou <Wentao.Lou@amd.com>
Date: Thu, 6 Dec 2018 10:29:52 +0800
Subject: [PATCH 0919/2940] drm/amdgpu: Skip ring soft recovery when fence was
 NULL
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

amdgpu_ring_soft_recovery would have Call-Trace,
when s_fence->parent was NULL inside amdgpu_job_timedout.
Check fence first, as drm_sched_hw_job_reset did.

Signed-off-by: Wentao Lou <Wentao.Lou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
index 5b75bdc8dc28..335a0edf114b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
@@ -397,7 +397,7 @@ bool amdgpu_ring_soft_recovery(struct amdgpu_ring *ring, unsigned int vmid,
 {
 	ktime_t deadline = ktime_add_us(ktime_get(), 10000);
 
-	if (!ring->funcs->soft_recovery)
+	if (!ring->funcs->soft_recovery || !fence)
 		return false;
 
 	atomic_inc(&ring->adev->gpu_reset_counter);
-- 
2.17.1