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 <[email protected]>
joeyli · Jul 14, 2016 · d26592a · d26592a
1 parent 80187fd
commit d26592a
Showing 1 changed file with 1 addition and 6 deletions.
diff --git 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);