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| author | Rob Clark <robdclark@gmail.com> | 2017-06-13 09:15:36 -0400 |
|---|---|---|
| committer | Rob Clark <robdclark@gmail.com> | 2017-06-16 11:16:01 -0400 |
| commit | cb1e38181a0728777057fb03fc4cddb29b7fb24d (patch) | |
| tree | 27fbe164012963de61373865d74a73a289663752 /drivers/gpu/drm/msm/msm_gpu.c | |
| parent | 42a105e9cfaf0a0c74fdac5ba4ff17d6c0b024cd (diff) | |
| download | lwn-cb1e38181a0728777057fb03fc4cddb29b7fb24d.tar.gz lwn-cb1e38181a0728777057fb03fc4cddb29b7fb24d.zip | |
drm/msm: fix locking inconsistency for gpu->hw_init()
Most, but not all, paths where calling the with struct_mutex held. The
fast-path in msm_gem_get_iova() (plus some sub-code-paths that only run
the first time) was masking this issue.
So lets just always hold struct_mutex for hw_init(). And sprinkle some
WARN_ON()'s and might_lock() to avoid this sort of problem in the
future.
Signed-off-by: Rob Clark <robdclark@gmail.com>
Diffstat (limited to 'drivers/gpu/drm/msm/msm_gpu.c')
| -rw-r--r-- | drivers/gpu/drm/msm/msm_gpu.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c index 5b118e8ead18..ebbaed442e8a 100644 --- a/drivers/gpu/drm/msm/msm_gpu.c +++ b/drivers/gpu/drm/msm/msm_gpu.c @@ -203,6 +203,8 @@ int msm_gpu_hw_init(struct msm_gpu *gpu) { int ret; + WARN_ON(!mutex_is_locked(&gpu->dev->struct_mutex)); + if (!gpu->needs_hw_init) return 0; |