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From 4c56edf04f03978335d7b4a3bd97f39dbcf076ca Mon Sep 17 00:00:00 2001
From: Christian Koenig <christian.koenig@amd.com>
Date: Wed, 24 Jan 2018 13:37:48 +0100
Subject: [PATCH 3293/4131] drm/amdgpu: fix locking in vega10_ih_prescreen_iv
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
The vm pointer can become invalid as soon as the lock is released.
Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/amd/amdgpu/vega10_ih.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/vega10_ih.c b/drivers/gpu/drm/amd/amdgpu/vega10_ih.c
index 926c2d3..9589e0a 100644
--- a/drivers/gpu/drm/amd/amdgpu/vega10_ih.c
+++ b/drivers/gpu/drm/amd/amdgpu/vega10_ih.c
@@ -278,9 +278,9 @@ static bool vega10_ih_prescreen_iv(struct amdgpu_device *adev)
/* Track retry faults in per-VM fault FIFO. */
spin_lock(&adev->vm_manager.pasid_lock);
vm = idr_find(&adev->vm_manager.pasid_idr, pasid);
- spin_unlock(&adev->vm_manager.pasid_lock);
if (WARN_ON_ONCE(!vm)) {
/* VM not found, process it normally */
+ spin_unlock(&adev->vm_manager.pasid_lock);
amdgpu_ih_clear_fault(adev, key);
return true;
}
@@ -288,9 +288,11 @@ static bool vega10_ih_prescreen_iv(struct amdgpu_device *adev)
r = kfifo_put(&vm->faults, key);
if (!r) {
/* FIFO is full. Ignore it until there is space */
+ spin_unlock(&adev->vm_manager.pasid_lock);
amdgpu_ih_clear_fault(adev, key);
goto ignore_iv;
}
+ spin_unlock(&adev->vm_manager.pasid_lock);
/* It's the first fault for this address, process it normally */
return true;
--
2.7.4
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