x86/amd-iommu: Search for existind dev_data before allocting a new one
Search for existing dev_data first will allow to switch
dev_data->alias to just store dev_data instead of struct
device.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 2d914a4..f647998 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -102,6 +102,37 @@
kfree(dev_data);
}
+static struct iommu_dev_data *search_dev_data(u16 devid)
+{
+ struct iommu_dev_data *dev_data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dev_data_list_lock, flags);
+ list_for_each_entry(dev_data, &dev_data_list, dev_data_list) {
+ if (dev_data->devid == devid)
+ goto out_unlock;
+ }
+
+ dev_data = NULL;
+
+out_unlock:
+ spin_unlock_irqrestore(&dev_data_list_lock, flags);
+
+ return dev_data;
+}
+
+static struct iommu_dev_data *find_dev_data(u16 devid)
+{
+ struct iommu_dev_data *dev_data;
+
+ dev_data = search_dev_data(devid);
+
+ if (dev_data == NULL)
+ dev_data = alloc_dev_data(devid);
+
+ return dev_data;
+}
+
static inline u16 get_device_id(struct device *dev)
{
struct pci_dev *pdev = to_pci_dev(dev);
@@ -178,7 +209,7 @@
if (dev->archdata.iommu)
return 0;
- dev_data = alloc_dev_data(get_device_id(dev));
+ dev_data = find_dev_data(get_device_id(dev));
if (!dev_data)
return -ENOMEM;