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Commit 24dc64c1 authored by Thomas Hellstrom's avatar Thomas Hellstrom
Browse files

drm/ttm: Export ttm_bo_get_unless_zero() 



Export ttm_bo_get_unless_zero() to be used when looking up buffer
objects that are removed from the lookup structure in the destructor.

Signed-off-by: default avatarThomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: default avatarSinclair Yeh <syeh@vmware.com>
Reviewed-by: default avatarChristian König <christian.koenig@amd.com>
parent e14c02e6

drivers/gpu/drm/ttm/ttm_bo_vm.c

+1 −2
Original line number Diff line number Diff line
@@ -409,8 +409,7 @@ static struct ttm_buffer_object *ttm_bo_vm_lookup(struct ttm_bo_device *bdev, 
	node = drm_vma_offset_lookup_locked(&bdev->vma_manager, offset, pages);

	if (likely(node)) {

		bo = container_of(node, struct ttm_buffer_object, vma_node);

		if (!kref_get_unless_zero(&bo->kref))

			bo = NULL;

		bo = ttm_bo_get_unless_zero(bo);

	}



	drm_vma_offset_unlock_lookup(&bdev->vma_manager);

include/drm/ttm/ttm_bo_api.h

+18 −0
Original line number Diff line number Diff line
@@ -312,6 +312,24 @@ ttm_bo_reference(struct ttm_buffer_object *bo) 
	return bo;

}



/**

 * ttm_bo_get_unless_zero - reference a struct ttm_buffer_object unless

 * its refcount has already reached zero.

 * @bo: The buffer object.

 *

 * Used to reference a TTM buffer object in lookups where the object is removed

 * from the lookup structure during the destructor and for RCU lookups.

 *

 * Returns: @bo if the referencing was successful, NULL otherwise.

 */

static inline __must_check struct ttm_buffer_object *

ttm_bo_get_unless_zero(struct ttm_buffer_object *bo)

{

	if (!kref_get_unless_zero(&bo->kref))

		return NULL;

	return bo;

}



/**

 * ttm_bo_wait - wait for buffer idle.

 *