[PATCH 3/3] iommu/vt-d:Add mutex_unlock() before returning

[FelixCuioc]

In the probe_acpi_namespace_devices function,when the physical
node of the acpi device is NULL,the unlock function is missing.
Add mutex_unlock(&adev->physical_node_lock).

Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: FelixCuioc <FelixCui-oc@xxxxxxxxxxx>
---
 drivers/iommu/intel/iommu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index b31f02f41c96..25e9853cba1b 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -4851,6 +4851,7 @@ static int __init probe_acpi_namespace_devices(void)
 			if (pn_dev == NULL) {
 				dev->bus->iommu_ops = &intel_iommu_ops;
 				ret = iommu_probe_device(dev);
+				mutex_unlock(&adev->physical_node_lock);
 				if (ret) {
 					pr_err("acpi_device probe fail! ret:%d\n", ret);
 					return ret;
-- 
2.17.1