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drm/mm: Document locking rules

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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>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
[danvet: s/alloc|freeing/modifications/ per Chris' suggestion.]
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1482833457-29592-1-git-send-email-daniel.vetter@ffwll.ch
This commit is contained in:
Daniel Vetter 2016-12-27 11:10:57 +01:00
parent adb040b86b
commit 1c9bd1ede8
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/drm_mm.c
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@ -90,6 +90,11 @@
*
* 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
* modifications 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_in_range_generic(const struct drm_mm *mm,