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

[Zeng, Oak]

Reviewed-by: Oak Zeng <Oak.Zeng at amd.com>

Thanks,
Oak

-----Original Message-----
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Yang, Philip
Sent: Thursday, January 31, 2019 9:26 AM
To: amd-gfx at lists.freedesktop.org
Cc: Yang, Philip <Philip.Yang at amd.com>
Subject: [PATCH] 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, 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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