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c84eab5850
devm_kstrdup() returns pointer to allocated string on success, NULL on failure. So it is better to check the return value of it. Before, if devm_kstrdup() fails, pinctrl_dev_name will be NULL, then the retval below will be a negative error-code (inside gpiochip_add_pin_range(), pinctrl_find_and_add_gpio_range()->get_pinctrl_dev_from_devname() will finally check pinctrl_dev_name and return an error), so the failure of devm_kstrdup() can be only implicitly caught after a long call chain. While this patch is to explicitly catch the failure in time. Signed-off-by: Xiaoke Wang <xkernel.wang@foxmail.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.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.
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.