Drivers may want to set their own callbacks for a VM area. Only set
TTM's callbacks if the vm_ops field is clear.
Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
drivers/gpu/drm/ttm/ttm_bo_vm.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
index b31b18058965..bf4a213bc66c 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -534,7 +534,12 @@ static struct ttm_buffer_object *ttm_bo_vm_lookup(struct ttm_device *bdev,
static void ttm_bo_mmap_vma_setup(struct ttm_buffer_object *bo, struct vm_area_struct *vma)
{
- vma->vm_ops = &ttm_bo_vm_ops;
+ /*
+ * Drivers may want to override the vm_ops field. Otherwise we
+ * use TTM's default callbacks.
+ */
+ if (!vma->vm_ops)
+ vma->vm_ops = &ttm_bo_vm_ops;
/*
* Note: We're transferring the bo reference to
--
2.30.2
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