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After commit48e7b8e284("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>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.