iommu/amd: Use dev_data->domain in get_domain()

Using the cached value is much more efficient than calling
into the IOMMU core code.

Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index acad37c3f0a164b01791de4cf971183dd47cb8c4..155a3e6f1373e34be63768e911acf1055f481343 100644 (file)
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2215,16 +2215,11 @@ static void queue_add(struct dma_ops_domain *dma_dom,
 static struct protection_domain *get_domain(struct device *dev)
 {
        struct protection_domain *domain;
-       struct iommu_domain *io_domain;
 
        if (!check_device(dev))
                return ERR_PTR(-EINVAL);
 
-       io_domain = iommu_get_domain_for_dev(dev);
-       if (!io_domain)
-               return NULL;
-
-       domain = to_pdomain(io_domain);
+       domain = get_dev_data(dev)->domain;
        if (!dma_ops_domain(domain))
                return ERR_PTR(-EBUSY);