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b32415652a
Calling gpiochip_find() from interrupt handler in this driver is an abuse of the GPIO API. It only happens to work because nobody added a might_sleep() to it and the lock used by GPIOLIB is a spinlock. Both will soon be changed as we're limiting both the number of interfaces allowed to be called from atomic context as well as making struct gpio_chip private to the GPIO code that owns it. We'll also switch to protecting the global GPIO device list with a mutex as there is no reason to allow changes to it from interrupt handlers. Instead of iterating over all SPRD chips and looking up each corresponding GPIO chip, let's make each SPRD GPIO controller register with a notifier chain. The chain will be called at interrupt so that every chip that already probed will be notified. The rest of the interrupt handling remains the same. This should result in faster code as we're avoiding iterating over the list of all GPIO devices. Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> Reviewed-by: Chunyan Zhang <zhang.lyra@gmail.com> Tested-by: Wenhua Lin <wenhua.lin@unisoc.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.