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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>
This commit is contained in:
Joerg Roedel 2016-07-07 15:31:13 +02:00
parent 80187fd39d
commit d26592a93d
1 changed files with 1 additions and 6 deletions
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7
drivers/iommu/amd_iommu.c
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@ -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);