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Returning an error code in the remove function of a platform device has no effect (compared to returning zero) apart from an error message, that the error is ignored. Then the device is removed irrespective of the returned value. As kmb_ocs_hcu_remove is only called after kmb_ocs_hcu_probe() returned successfully, platform_get_drvdata() never returns NULL and so the respective check can just be dropped. crypto_engine_exit() might return an error code but already emits an error message in that case, so better return zero in kmb_ocs_hcu_remove() even in this case to suppress another error message. All other crypto drivers also ignore the return value of crypto_engine_exit(). Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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.