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37174f3341
Use raw_spinlock in order to fix spurious messages about invalid context when spinlock debugging is enabled. This happens because there is a legit nested raw_spinlock->spinlock locking usage within IRQ-related code. IRQ core uses raw spinlock and then Tegra GPIO driver uses a nested spinlock. The debug code can't recognize and handle this case, hence we need to use raw spinlock in the GPIO driver. [ BUG: Invalid wait context ] ... (dump_stack) from (__lock_acquire) (__lock_acquire) from (lock_acquire) (lock_acquire) from (_raw_spin_lock_irqsave) (_raw_spin_lock_irqsave) from (tegra_gpio_irq_set_type) (tegra_gpio_irq_set_type) from (__irq_set_trigger) (__irq_set_trigger) from (__setup_irq) (__setup_irq) from (request_threaded_irq) (request_threaded_irq) from (devm_request_threaded_irq) (devm_request_threaded_irq) from (elants_i2c_probe) (elants_i2c_probe) from (i2c_device_probe) ... Tested-by: Peter Geis <pgwipeout@gmail.com> Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.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.