From: Joerg Roedel <jroedel@suse.de>
Date: Thu, 7 Jul 2016 13:31:13 +0000 (+0200)
Subject: iommu/amd: Use dev_data->domain in get_domain()
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=d26592a93ddb7a73cbd82b08e2e0d2985d68d750;p=deliverable%2Flinux.git

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 acad37c3f0a1..155a3e6f1373 100644
--- 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);