[Intel-xe] [PATCH 4/6] drm/xe/bo: Gracefully handle errors from ttm_bo_move_accel_cleanup().

["Thomas Hellström" <thomas.hellstrom@linux.intel.com>]

The function ttm_bo_move_accel_cleanup() attempts to help pipeline a
move, and in doing so, needs memory allocations which may fail.

Rather than failing in a state where the new resource may freed while
accessed by the copy engine, sync uninterruptible and do a failsafe
cleanup.

Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
---
 drivers/gpu/drm/xe/xe_bo.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/xe_bo.c b/drivers/gpu/drm/xe/xe_bo.c
index 94dd11066f51..77d5c5710688 100644
--- a/drivers/gpu/drm/xe/xe_bo.c
+++ b/drivers/gpu/drm/xe/xe_bo.c
@@ -689,10 +689,15 @@ static int xe_bo_move(struct ttm_buffer_object *ttm_bo, bool evict,
 		if (!move_lacks_source) {
 			ret = ttm_bo_move_accel_cleanup(ttm_bo, fence, evict,
 							true, new_mem);
-		} else {
+			if (ret)
+				dma_fence_wait(fence, false);
+		}
+
+		if (move_lacks_source || ret) {
 			dma_resv_add_fence(ttm_bo->base.resv, fence,
 					   DMA_RESV_USAGE_KERNEL);
 			ttm_bo_move_null(ttm_bo, new_mem);
+			ret = 0;
 		}
 
 		dma_fence_put(fence);
-- 
2.40.1