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95e060e68b
It's pointless to scan the hub' i2c-bus segment if GPIOs aren't supported
by the system, since no GPIO-driven reset could be cleared by the driver
then. Moreover if CONFIG_GPIOLIB is disabled the gpio_chip structure
definition won't be available, which causes the incomplete type pointer
dereference compilation error. In order to fix this we need to create an
empty usb251x_check_gpio_chip() method returning zero, so the driver would
skip the i2c-bus segment checking and proceed with further probing in this
case.
Fixes: 6e3c8beb4f ("usb: usb251xb: Lock i2c-bus segment the hub resides")
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Serge Semin <fancer.lancer@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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.