From 5bd31ab5f79eb6e3bdfa0ca0b57650f9d1604062 Mon Sep 17 00:00:00 2001 From: Shivaprasad G Bhat Date: Thu, 15 Feb 2024 07:52:32 -0600 Subject: [PATCH] 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 Signed-off-by: Shivaprasad G Bhat Signed-off-by: Michael Ellerman Link: https://msgid.link/170800513841.2411.13524607664262048895.stgit@linux.ibm.com --- arch/powerpc/kernel/iommu.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c index 1185efebf032..29a8c8e18585 100644 --- a/arch/powerpc/kernel/iommu.c +++ b/arch/powerpc/kernel/iommu.c @@ -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