Drivers need to take care. Motivated by a discussion between Mark and Rob on dri-devel.

Cc: Mark yao mark.yao@rock-chips.com Cc: Rob Clark robdclark@gmail.com Signed-off-by: Daniel Vetter daniel.vetter@intel.com --- drivers/gpu/drm/drm_mm.c | 5 +++++ 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c index ca1e344f318d..6109e022e000 100644 --- a/drivers/gpu/drm/drm_mm.c +++ b/drivers/gpu/drm/drm_mm.c @@ -89,6 +89,11 @@ * * Finally iteration helpers to walk all nodes and all holes are provided as are * some basic allocator dumpers for debugging. + * + * Note that this range allocator is not thread-safe, drivers need to protect + * allocation and freeing with their on locking. The idea behind this is that + * for a full memory manager additional data needs to be protected anyway, hence + * internal locking would be fully redundant. */

static struct drm_mm_node *drm_mm_search_free_generic(const struct drm_mm *mm,