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Simon Horman 542cdf4068 thermal: rcar_thermal: avoid NULL dereference in absence of IRQ resources
Ensure that the base address used by a call to rcar_thermal_common_write()
may be NULL if the SOC supports interrupts for use with the thermal device
but none are defined in DT as is the case for R-Car H1 (r8a7779). Guard
against this condition to prevent a NULL dereference when the device is
probed.

Tested on:
* R-Mobile APE6 (r8a73a4) / APE6EVM
* R-Car H1 (r8a7779) / Marzen
* R-Car H2 (r8a7790) / Lager
* R-Car M2-W (r8a7791) / Koelsch
* R-Car M2-N (r8a7793) / Gose
* R-Car D3 ES1.0 (r8a77995) / Draak

Fixes: 1969d9dc20 ("thermal: rcar_thermal: add r8a77995 support")
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
History 2018-07-27 16:45:36 -07:00
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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.
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.