It requires to validate the release process eviction fence before
signal the fence.

Signed-off-by: Prike Liang <prike.li...@amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_process.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c 
b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
index 0976b5b0e8e8..083f83c94531 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
@@ -1160,7 +1160,8 @@ static void kfd_process_wq_release(struct work_struct 
*work)
         */
        synchronize_rcu();
        ef = rcu_access_pointer(p->ef);
-       dma_fence_signal(ef);
+       if (ef)
+               dma_fence_signal(ef);
 
        kfd_process_remove_sysfs(p);
 
-- 
2.34.1

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