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At present there was no check for the return status of pm_runtime_get_sync() before assess the registers. That would return a failure, such as -EAGAIN, -EBUSY, -EASSCES, and the access of registers without enabling the clocks for the rng would trigger a bus exception and kernel hang. Change-Id: Id95361dd12ec6a4be2b70f386de721327cbb607c Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com>
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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.