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| author |   Daniel Vetter <daniel.vetter@ffwll.ch> | 2016-12-27 11:10:57 +0100 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2016-12-28 14:05:20 +0100 |
| commit | 1c9bd1ede83cb391db2af481c73b01b63ab41e96 (patch) | |
| tree | 928e5b165223a3d26d886a442427e4ccd4807f37 /drivers/gpu/drm/drm_mm.c | |
| parent | drm: Use drm_mm_insert_node_in_range_generic() for everyone (diff) | |
| download | linux-dev-1c9bd1ede83cb391db2af481c73b01b63ab41e96.tar.xz linux-dev-1c9bd1ede83cb391db2af481c73b01b63ab41e96.zip | |
drm/mm: Document locking rules
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
Diffstat (limited to 'drivers/gpu/drm/drm_mm.c')
| -rw-r--r-- | drivers/gpu/drm/drm_mm.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c index 58a7e3bbe130..713f4336107f 100644 --- a/drivers/gpu/drm/drm_mm.c +++ b/drivers/gpu/drm/drm_mm.c @@ -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, |