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powerpc/iommu: Refactor spapr_tce_platform_iommu_attach_dev() 

The patch makes the iommu_group_get() call only when using it
thereby avoiding the unnecessary get & put for domain already
being set case.

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/170800513841.2411.13524607664262048895.stgit@linux.ibm.com
This commit is contained in:
Shivaprasad G Bhat 2024-02-15 07:52:32 -06:00 committed by Michael Ellerman
parent 39cd87c4eb
commit 5bd31ab5f7
1 changed files with 3 additions and 4 deletions
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7
arch/powerpc/kernel/iommu.c
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@ -1285,15 +1285,14 @@ spapr_tce_platform_iommu_attach_dev(struct iommu_domain *platform_domain,
struct device *dev)
{
struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
struct iommu_group *grp = iommu_group_get(dev);
struct iommu_table_group *table_group;
struct iommu_group *grp;
/* At first attach the ownership is already set */
if (!domain) {
iommu_group_put(grp);
if (!domain)
return 0;
}
grp = iommu_group_get(dev);
table_group = iommu_group_get_iommudata(grp);
/*
* The domain being set to PLATFORM from earlier