Commit fa582c6f authored by Philip Yang's avatar Philip Yang Committed by Alex Deucher

drm/amdkfd: Use mmget_not_zero in MMU notifier

MMU notifier callback may pass in mm with mm->mm_users==0 when process
is exiting, use mmget_no_zero to avoid accessing invalid mm in deferred
list work after mm is gone.
Signed-off-by: default avatarPhilip Yang <Philip.Yang@amd.com>
Reviewed-by: default avatarFelix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 2a460963
...@@ -2307,6 +2307,8 @@ svm_range_cpu_invalidate_pagetables(struct mmu_interval_notifier *mni, ...@@ -2307,6 +2307,8 @@ svm_range_cpu_invalidate_pagetables(struct mmu_interval_notifier *mni,
if (range->event == MMU_NOTIFY_RELEASE) if (range->event == MMU_NOTIFY_RELEASE)
return true; return true;
if (!mmget_not_zero(mni->mm))
return true;
start = mni->interval_tree.start; start = mni->interval_tree.start;
last = mni->interval_tree.last; last = mni->interval_tree.last;
...@@ -2333,6 +2335,7 @@ svm_range_cpu_invalidate_pagetables(struct mmu_interval_notifier *mni, ...@@ -2333,6 +2335,7 @@ svm_range_cpu_invalidate_pagetables(struct mmu_interval_notifier *mni,
} }
svm_range_unlock(prange); svm_range_unlock(prange);
mmput(mni->mm);
return true; return true;
} }
......
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