drm/amdgpu: fix no sync_wait in copy_buffer

when eviction is happening, if don't handle
dependency, then the fence could be dead off.

Signed-off-by: Chunming Zhou <david1.zhou@amd.com>
Reviewed-by: Jammy Zhou <Jammy.Zhou@amd.com>
Reviewed-by: Christian K?nig <christian.koenig@amd.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index d7c02e1a309e..4cb81320b045 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1014,13 +1014,19 @@ int amdgpu_copy_buffer(struct amdgpu_ring *ring,
         /* for fence and sync */
         num_dw += 64 + AMDGPU_NUM_SYNCS * 8;
 
+        r = amdgpu_sync_wait(&sync);
+        if (r) {
+                DRM_ERROR("sync wait failed (%d).\n", r);
+                amdgpu_sync_free(adev, &sync, NULL);
+                return r;
+        }
+
         r = amdgpu_ring_lock(ring, num_dw);
         if (r) {
                 DRM_ERROR("ring lock failed (%d).\n", r);
                 amdgpu_sync_free(adev, &sync, NULL);
                 return r;
         }
-
         amdgpu_sync_rings(&sync, ring);
 
         for (i = 0; i < num_loops; i++) {