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drm/amdkfd: Use mmget_not_zero in MMU notifier

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[ Upstream commit fa582c6f36 ]

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: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Philip Yang 2022-05-26 16:15:38 -04:00 committed by Greg Kroah-Hartman
parent a2010538c9
commit 09c5cdbc62
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/amd/amdkfd/kfd_svm.c
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@ -2181,6 +2181,8 @@ svm_range_cpu_invalidate_pagetables(struct mmu_interval_notifier *mni,
if (range->event == MMU_NOTIFY_RELEASE)
return true;
if (!mmget_not_zero(mni->mm))
return true;
start = mni->interval_tree.start;
last = mni->interval_tree.last;
@ -2207,6 +2209,7 @@ svm_range_cpu_invalidate_pagetables(struct mmu_interval_notifier *mni,
}
svm_range_unlock(prange);
mmput(mni->mm);
return true;
}