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47a3734b03
gpiochip_add_data being called before might cause premature calls of the gpiochip operations before the port_config values are initialized, which would possibily write zeros to port configuration registers, an operation not allowed. For example, if there are gpio-hog nodes in a device-tree, the sequence of function calls are performed gpiochip_add_data of_gpiochip_add of_gpiochip_scan_gpios of_gpiochip_add_hog gpiod_hog gpiochip_request_own_desc gpiod_configure_flags gpiod_direction_output/gpiod_direction_input which would call later the gpiochip operation direction_output or direction_input prior the port_config[] initialization. Moreover, gpiochip_get_data is replaced by the container_of macro inside the gpiochip operations, which would allow the calling of max7301_direction_input prior to gpiochip_add_data Signed-off-by: Rodrigo Alencar <455.rodrigo.alencar@gmail.com> [Bartosz: tweaked the commit message] Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> |
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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.