drm/amdgpu: extend lock range for race condition when gpu reset

to cover below case:
1. A task gart bind/unbind but not add to adev->gtt_list yet
2. at this time gpu reset, gtt only recover those gtt in adev->gtt_list

Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Roger.He <Hongbo.He@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c
index 902e6015abca..a57abc1a25fb 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c
@@ -224,8 +224,9 @@ void amdgpu_gart_table_vram_free(struct amdgpu_device *adev)
  *
  * Unbinds the requested pages from the gart page table and
  * replaces them with the dummy page (all asics).
+ * Returns 0 for success, -EINVAL for failure.
  */
-void amdgpu_gart_unbind(struct amdgpu_device *adev, uint64_t offset,
+int amdgpu_gart_unbind(struct amdgpu_device *adev, uint64_t offset,
                         int pages)
 {
         unsigned t;
@@ -237,7 +238,7 @@ void amdgpu_gart_unbind(struct amdgpu_device *adev, uint64_t offset,
 
         if (!adev->gart.ready) {
                 WARN(1, "trying to unbind memory from uninitialized GART !\n");
-                return;
+                return -EINVAL;
         }
 
         t = offset / AMDGPU_GPU_PAGE_SIZE;
@@ -258,6 +259,7 @@ void amdgpu_gart_unbind(struct amdgpu_device *adev, uint64_t offset,
         }
         mb();
         amdgpu_gart_flush_gpu_tlb(adev, 0);
+        return 0;
 }
 
 /**