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Commitbcb81ac6ae("iommu: Get DT/ACPI parsing into the proper probe path") changed the sequence of probing the SYSMMU controller devices and calls to arm_iommu_attach_device(), what results in resuming SYSMMU controller earlier, when it is still set to IDENTITY mapping. Such change revealed the bug in IDENTITY handling in the exynos-iommu driver. When SYSMMU controller is set to IDENTITY mapping, data->domain is NULL, so adjust checks in suspend & resume callbacks to handle this case correctly. Fixes:b3d14960e6("iommu/exynos: Implement an IDENTITY domain") Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Link: https://lore.kernel.org/r/20250401202731.2810474-1-m.szyprowski@samsung.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
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.