drm/msm: Drop struct_mutex in madvise path

Browse source

The obj->lock is sufficient for what we need.

This *does* have the implication that userspace can try to shoot
themselves in the foot by racing madvise(DONTNEED) with submit.  But
the result will be about the same if they did madvise(DONTNEED) before
the submit ioctl, ie. they might not get want they want if they race
with shrinker.  But iova fault handling is robust enough, so userspace
is only shooting it's own foot.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Signed-off-by: Rob Clark <robdclark@chromium.org>

...

This commit is contained in:

Rob Clark 2020-10-23 09:51:22 -07:00

parent c951a9b284

commit f92f026a48

3 changed files with 3 additions and 14 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

11

drivers/gpu/drm/msm/msm_drv.c

View file

4

drivers/gpu/drm/msm/msm_gem.c

View file

2

drivers/gpu/drm/msm/msm_gem.h

View file