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 acad37c3..155a3e6 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2215,16 +2215,11 @@
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);