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51821765e8
In the rare case in which one of the clock drivers has divider clocks
but not composite clocks, mtk_clk_simple_probe() would not io(re)map,
hence passing a NULL pointer to mtk_clk_register_dividers().
To fix this issue, extend the `if` conditional to also check if any
divider clocks are present. While at it, also make sure the iomem
pointer is NULL if no composite/divider clocks are declared, as we
are checking for that when iounmapping it in the error path.
This hasn't been seen on any MediaTek clock driver as the current ones
always declare composite clocks along with divider clocks, but this is
still an important fix for a future potential KP.
Fixes:
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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.