[PATCH] drm/amdgpu: use spin_lock_irqsave to protect vm_manager.pasid_idr

[Yang, Philip]

amdgpu_vm_get_task_info is called from interrupt handler and sched timeout
workqueue, so it is needed to use irq version spin_lock to avoid deadlock.

Change-Id: Ifedd4b97535bf0b5d3936edd2d9688957020efd4
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 8f394a20a9eb..bfeb9007e100 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -3386,14 +3386,15 @@ void amdgpu_vm_get_task_info(struct amdgpu_device 
*adev, unsigned int pasid,
                         struct amdgpu_task_info *task_info)
 {
        struct amdgpu_vm *vm;
+       unsigned long flags;
 
-       spin_lock(&adev->vm_manager.pasid_lock);
+       spin_lock_irqsave(&adev->vm_manager.pasid_lock, flags);
 
        vm = idr_find(&adev->vm_manager.pasid_idr, pasid);
        if (vm)
                *task_info = vm->task_info;
 
-       spin_unlock(&adev->vm_manager.pasid_lock);
+       spin_unlock_irqrestore(&adev->vm_manager.pasid_lock, flags);
 }
 
 /**
-- 
2.17.1

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