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drm/amdgpu: fix amdgpu_vm_pasid_fault_credit 

As soon as the lock is dropped the VM pointer can be invalid.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2018-01-09 19:18:59 +01:00 committed by Alex Deucher
parent e2721595e4
commit d958939afc
1 changed files with 7 additions and 3 deletions
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10
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
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@ -2478,17 +2478,21 @@ bool amdgpu_vm_pasid_fault_credit(struct amdgpu_device *adev,
spin_lock(&adev->vm_manager.pasid_lock);
vm = idr_find(&adev->vm_manager.pasid_idr, pasid);
spin_unlock(&adev->vm_manager.pasid_lock);
if (!vm)
if (!vm) {
/* VM not found, can't track fault credit */
spin_unlock(&adev->vm_manager.pasid_lock);
return true;
}
/* No lock needed. only accessed by IRQ handler */
if (!vm->fault_credit)
if (!vm->fault_credit) {
/* Too many faults in this VM */
spin_unlock(&adev->vm_manager.pasid_lock);
return false;
}
vm->fault_credit--;
spin_unlock(&adev->vm_manager.pasid_lock);
return true;
}