drm/amdgpu: amdgpu_device_recover_vram always failed if only one node in shadow_list

amdgpu_bo_restore_shadow would assign zero to r if succeeded.
r would remain zero if there is only one node in shadow_list.
current code would always return failure when r <= 0.
restart the timeout for each wait was a rather problematic bug as well.
The value of tmo SHOULD be changed, otherwise we wait tmo jiffies on each loop.

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>

1 files changed, 9 insertions, 4 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index ac0d646a7b74..5d8b30fd4534 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -3173,11 +3173,16 @@ static int amdgpu_device_recover_vram(struct amdgpu_device *adev)
                         break;
 
                 if (fence) {
-                        r = dma_fence_wait_timeout(fence, false, tmo);
+                        tmo = dma_fence_wait_timeout(fence, false, tmo);
                         dma_fence_put(fence);
                         fence = next;
-                        if (r <= 0)
+                        if (tmo == 0) {
+                                r = -ETIMEDOUT;
                                 break;
+                        } else if (tmo < 0) {
+                                r = tmo;
+                                break;
+                        }
                 } else {
                         fence = next;
                 }
@@ -3188,8 +3193,8 @@ static int amdgpu_device_recover_vram(struct amdgpu_device *adev)
                 tmo = dma_fence_wait_timeout(fence, false, tmo);
         dma_fence_put(fence);
 
-        if (r <= 0 || tmo <= 0) {
-                DRM_ERROR("recover vram bo from shadow failed\n");
+        if (r < 0 || tmo <= 0) {
+                DRM_ERROR("recover vram bo from shadow failed, r is %ld, tmo is %ld\n", r, tmo);
                 return -EIO;
         }