drm/amdgpu: always wait before kmap a BO

When a BO is currently moving we otherwise would blindly
access the new location without checking.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 11 insertions, 5 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index 9a025a77958d..151a2d42c639 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -308,7 +308,7 @@ int amdgpu_bo_create(struct amdgpu_device *adev,
 int amdgpu_bo_kmap(struct amdgpu_bo *bo, void **ptr)
 {
         bool is_iomem;
-        int r;
+        long r;
 
         if (bo->flags & AMDGPU_GEM_CREATE_NO_CPU_ACCESS)
                 return -EPERM;
@@ -319,14 +319,20 @@ int amdgpu_bo_kmap(struct amdgpu_bo *bo, void **ptr)
                 }
                 return 0;
         }
+
+        r = reservation_object_wait_timeout_rcu(bo->tbo.resv, false, false,
+                                                MAX_SCHEDULE_TIMEOUT);
+        if (r < 0)
+                return r;
+
         r = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages, &bo->kmap);
-        if (r) {
+        if (r)
                 return r;
-        }
+
         bo->kptr = ttm_kmap_obj_virtual(&bo->kmap, &is_iomem);
-        if (ptr) {
+        if (ptr)
                 *ptr = bo->kptr;
-        }
+
         return 0;
 }