[PATCH] intel-iommu: Add device info into list before doing context mapping

["Hao, Xudong" <xudong.hao@intel.com>]

This patch add device info into list before do context mapping. Because device info will be used by iommu_enable_dev_iotlb function, in this function, pci_enable_ats would not be called without this patch, so ATS did not enable while a PCI device which has ATS capability is assigned to a guest.

Signed-off-by: Xudong Hao <xudong.hao@intel.com>
Signed-off-by: Xiantao Zhang <xiantao.zhang@intel.com>
---
 drivers/iommu/intel-iommu.c |   14 ++++++++------
 1 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index c0c7820..f0b5d38 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -2264,12 +2264,6 @@ static int domain_add_dev_info(struct dmar_domain *domain,
 	if (!info)
 		return -ENOMEM;
 
-	ret = domain_context_mapping(domain, pdev, translation);
-	if (ret) {
-		free_devinfo_mem(info);
-		return ret;
-	}
-
 	info->segment = pci_domain_nr(pdev->bus);
 	info->bus = pdev->bus->number;
 	info->devfn = pdev->devfn;
@@ -2282,6 +2276,14 @@ static int domain_add_dev_info(struct dmar_domain *domain,
 	pdev->dev.archdata.iommu = info;
 	spin_unlock_irqrestore(&device_domain_lock, flags);
 
+	ret = domain_context_mapping(domain, pdev, translation);
+	if (ret) {
+		list_del(&info->link);
+		list_del(&info->global);
+		free_devinfo_mem(info);
+		return ret;
+	}
+
 	return 0;
 }