drm/amdgpu: only move pt bos in LRU list on success

This fixes a race condition in the error case: since the pt bos have not
necessarily been reserved in case of an error, we could move a pt bo that
is currently in the middle of being evicted/moved by another process,
which then resulted in a BUG_ON in ttm_bo_add_to_lru.

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

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index 6f89f8e..b882e81 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -478,9 +478,9 @@ static void amdgpu_cs_parser_fini(struct amdgpu_cs_parser *parser, int error, bo
        struct amdgpu_fpriv *fpriv = parser->filp->driver_priv;
        unsigned i;
 
-       amdgpu_vm_move_pt_bos_in_lru(parser->adev, &fpriv->vm);
-
        if (!error) {
+               amdgpu_vm_move_pt_bos_in_lru(parser->adev, &fpriv->vm);
+
                /* Sort the buffer list from the smallest to largest buffer,
                 * which affects the order of buffers in the LRU list.
                 * This assures that the smallest buffers are added first