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Although we WARN in arm_smmu_add_device() if the device being added has been added already without a subsequent call to arm_smmu_remove_device(), we still continue half-heartedly, initialising the stream-table for any new StreamIDs that may have magically appeared and re-establishing device links that should still be there from last time. Given that calling ->add_device() twice without removing the device in the meantime is indicative of an error in the caller, just return -EBUSY after warning. Cc: Robin Murphy <robin.murphy@arm.com> Cc: Jean Philippe-Brucker <jean-philippe@linaro.org> 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 Restructured Text 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.