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From 0c670ebe392faae5c1ddf407d8b9631126bd1094 Mon Sep 17 00:00:00 2001
From: Felix Kuehling <Felix.Kuehling@amd.com>
Date: Thu, 14 Jan 2016 00:35:08 -0500
Subject: [PATCH 0316/1110] drm/amdgpu: Fix race condition in MMU notifier
release
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
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: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
index 61f0e3c..1b2105c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
@@ -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);
}
--
2.7.4
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