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x86/amd-iommu: Search for existind dev_data before allocting a new one

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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>
This commit is contained in:
Joerg Roedel
2011-06-09 18:53:25 +02:00
parent 2b02b091ab
commit 3b03bb745e
1 changed files with 32 additions and 1 deletions
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33
arch/x86/kernel/amd_iommu.c
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@@ -102,6 +102,37 @@ static void free_dev_data(struct iommu_dev_data *dev_data)
kfree(dev_data); 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) static inline u16 get_device_id(struct device *dev)
{ {
struct pci_dev *pdev = to_pci_dev(dev); struct pci_dev *pdev = to_pci_dev(dev);
@@ -178,7 +209,7 @@ static int iommu_init_device(struct device *dev)
if (dev->archdata.iommu) if (dev->archdata.iommu)
return 0; return 0;
dev_data = alloc_dev_data(get_device_id(dev)); dev_data = find_dev_data(get_device_id(dev));
if (!dev_data) if (!dev_data)
return -ENOMEM; return -ENOMEM;