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Commit fa5b5000 authored by Felix Kuehling's avatar Felix Kuehling Committed by Alex Deucher
Browse files

drm/amdgpu: Fix race condition in MMU notifier release 



The release notifier can get called a second time from
mmu_notifier_unregister depending on a race between
__mmu_notifier_release and amdgpu_mn_destroy. Use
mmu_notifier_unregister_no_release to avoid this.

Signed-off-by: default avatarFelix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: default avatarChristian König <christian.koenig@amd.com>
parent 477d9f0e

drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c

+1 −1
Original line number Diff line number Diff line
@@ -86,7 +86,7 @@ static void amdgpu_mn_destroy(struct work_struct *work) 
	}

	mutex_unlock(&adev->mn_lock);

	up_write(&rmn->mm->mmap_sem);

	mmu_notifier_unregister(&rmn->mn, rmn->mm);

	mmu_notifier_unregister_no_release(&rmn->mn, rmn->mm);

	kfree(rmn);

}