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drm/ttm: Don't override vm_ops callbacks, if set

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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@suse.de>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210525151055.8174-2-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2021-05-25 17:10:49 +02:00
parent 8eca89a108
commit ccd9fe972c
1 changed files with 6 additions and 1 deletions
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7
drivers/gpu/drm/ttm/ttm_bo_vm.c
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@ -586,7 +586,12 @@ 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