From: Philip Yang <Philip.Yang@amd.com>
Date: Wed, 30 Jan 2019 20:21:16 +0000 (-0500)
Subject: drm/amdgpu: use spin_lock_irqsave to protect vm_manager.pasid_idr
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=0a5f49cbf9d6ad3721c16f8a6d823363ea7a160f;p=openwrt%2Fstaging%2Fblogic.git

drm/amdgpu: use spin_lock_irqsave to protect vm_manager.pasid_idr

amdgpu_vm_get_task_info is called from interrupt handler and sched timeout
workqueue, we should use irq version spin_lock to avoid deadlock.

Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index d2ea5ce2cefb..7c108e687683 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -3363,14 +3363,15 @@ 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);
 }
 
 /**