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739abce96d
[ Upstream commit e36eaf94be8f7bc4e686246eed3cf92d845e2ef8 ] The driver may sleep while holding a spinlock. The function call path (from bottom to top) in Linux 4.19 is: drivers/gpio/gpio-grgpio.c, 261: request_irq in grgpio_irq_map drivers/gpio/gpio-grgpio.c, 255: _raw_spin_lock_irqsave in grgpio_irq_map drivers/gpio/gpio-grgpio.c, 318: free_irq in grgpio_irq_unmap drivers/gpio/gpio-grgpio.c, 299: _raw_spin_lock_irqsave in grgpio_irq_unmap request_irq() and free_irq() can sleep at runtime. To fix these bugs, request_irq() and free_irq() are called without holding the spinlock. These bugs are found by a static analysis tool STCheck written by myself. Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com> Link: https://lore.kernel.org/r/20191218132605.10594-1-baijiaju1990@gmail.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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| README | ||
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.