intel-iommu: Move duplicate list-mangling code into unlink_domain_info() helper

Now we have four copies of this code, Linus "suggested" it was about time
we stopped copying it and turned it into a helper.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 13 insertions, 16 deletions

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index abab245371ee..b12af2ff8c54 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -1907,6 +1907,15 @@ static void iommu_detach_dev(struct intel_iommu *iommu, u8 bus, u8 devfn)
         iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH);
 }
 
+static inline void unlink_domain_info(struct device_domain_info *info)
+{
+        assert_spin_locked(&device_domain_lock);
+        list_del(&info->link);
+        list_del(&info->global);
+        if (info->dev)
+                info->dev->dev.archdata.iommu = NULL;
+}
+
 static void domain_remove_dev_info(struct dmar_domain *domain)
 {
         struct device_domain_info *info;
@@ -1917,10 +1926,7 @@ static void domain_remove_dev_info(struct dmar_domain *domain)
         while (!list_empty(&domain->devices)) {
                 info = list_entry(domain->devices.next,
                         struct device_domain_info, link);
-                list_del(&info->link);
-                list_del(&info->global);
-                if (info->dev)
-                        info->dev->dev.archdata.iommu = NULL;
+                unlink_domain_info(info);
                 spin_unlock_irqrestore(&device_domain_lock, flags);
 
                 iommu_disable_dev_iotlb(info);
@@ -2302,9 +2308,7 @@ static int domain_add_dev_info(struct dmar_domain *domain,
         ret = domain_context_mapping(domain, pdev, translation);
         if (ret) {
                 spin_lock_irqsave(&device_domain_lock, flags);
-                list_del(&info->link);
-                list_del(&info->global);
-                pdev->dev.archdata.iommu = NULL;
+                unlink_domain_info(info);
                 spin_unlock_irqrestore(&device_domain_lock, flags);
                 free_devinfo_mem(info);
                 return ret;
@@ -3733,10 +3737,7 @@ static void domain_remove_one_dev_info(struct dmar_domain *domain,
                 if (info->segment == pci_domain_nr(pdev->bus) &&
                     info->bus == pdev->bus->number &&
                     info->devfn == pdev->devfn) {
-                        list_del(&info->link);
-                        list_del(&info->global);
-                        if (info->dev)
-                                info->dev->dev.archdata.iommu = NULL;
+                        unlink_domain_info(info);
                         spin_unlock_irqrestore(&device_domain_lock, flags);
 
                         iommu_disable_dev_iotlb(info);
@@ -3791,11 +3792,7 @@ static void vm_domain_remove_all_dev_info(struct dmar_domain *domain)
         while (!list_empty(&domain->devices)) {
                 info = list_entry(domain->devices.next,
                         struct device_domain_info, link);
-                list_del(&info->link);
-                list_del(&info->global);
-                if (info->dev)
-                        info->dev->dev.archdata.iommu = NULL;
-
+                unlink_domain_info(info);
                 spin_unlock_irqrestore(&device_domain_lock, flags1);
 
                 iommu_disable_dev_iotlb(info);