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A number of iommu functions take a struct bus_type * and never modify the data passed in, so make them all const * as that is what the driver core is expecting to have passed into as well. This is a step toward making all struct bus_type pointers constant in the kernel. Cc: Will Deacon <will@kernel.org> Cc: Robin Murphy <robin.murphy@arm.com> Cc: iommu@lists.linux.dev Acked-by: Joerg Roedel <jroedel@suse.de> Link: https://lore.kernel.org/r/20230313182918.1312597-34-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>