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iommu/amd: Drop unnecessary checks in amd_iommu_attach_device() 

The same checks are done in amd_iommu_probe_device(). If any of them fails
there, then the device won't get a group, so there's no way for it to even
reach amd_iommu_attach_device anymore.

Link: https://lore.kernel.org/r/c054654a81f2b675c73108fe4bf10e45335a721a.1666042872.git.nicolinc@nvidia.com
Suggested-by: Robin Murphy <robin.murphy@arm.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Nicolin Chen 2022-10-17 16:00:45 -07:00 committed by Jason Gunthorpe
parent 30a0b95b13
commit 79218fd0b3
1 changed files with 2 additions and 10 deletions
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12
drivers/iommu/amd/iommu.c
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@ -2155,21 +2155,13 @@ static void amd_iommu_detach_device(struct iommu_domain *dom,
static int amd_iommu_attach_device(struct iommu_domain *dom,
struct device *dev)
{
struct iommu_dev_data *dev_data = dev_iommu_priv_get(dev);
struct protection_domain *domain = to_pdomain(dom);
struct iommu_dev_data *dev_data;
struct amd_iommu *iommu;
struct amd_iommu *iommu = rlookup_amd_iommu(dev);
int ret;
if (!check_device(dev))
return -EINVAL;
dev_data = dev_iommu_priv_get(dev);
dev_data->defer_attach = false;
iommu = rlookup_amd_iommu(dev);
if (!iommu)
return -EINVAL;
if (dev_data->domain)
detach_device(dev);