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iommu/arm-smmu-v3: Fix incorrect return in arm_smmu_attach_dev

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After commit 48e7b8e284 ("iommu/arm-smmu-v3: Remove
arm_smmu_domain_finalise() during attach"), an error code is not
returned on the attach path when the smmu does not match with the
domain. This causes problems with VFIO because
vfio_iommu_type1_attach_group() relies on this check to determine domain
compatability.

Re-instate the -EINVAL return value when the SMMU doesn't match on the
device attach path.

Fixes: 48e7b8e284 ("iommu/arm-smmu-v3: Remove arm_smmu_domain_finalise() during attach")
Signed-off-by: Qinxin Xia <xiaqinxin@huawei.com>
Link: https://lore.kernel.org/r/20250422112951.2027969-1-xiaqinxin@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Qinxin Xia 2025-04-22 19:29:51 +08:00 committed by Will Deacon
parent 8ffd015db8
commit be5a2d3f8f
1 changed files with 1 additions and 1 deletions
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2
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
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@ -2953,7 +2953,7 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
smmu = master->smmu;
if (smmu_domain->smmu != smmu)
return ret;
return -EINVAL;
if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
cdptr = arm_smmu_alloc_cd_ptr(master, IOMMU_NO_PASID);