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[ Upstream commit 5110f40241d08334375eb0495f174b1d2c07657e ] In the timeout handler we may need to complete a request because the request that timed out may be an I/O that is a part of a serial sequence of controller teardown or initialization. In order to complete the request, we need to fence any other context that may compete with us and complete the request that is timing out. In this case, we could have a potential double completion in case a hard-irq or a different competing context triggered error recovery and is running inflight request cancellation concurrently with the timeout handler. Protect using a ctrl teardown_lock to serialize contexts that may complete a cancelled request due to error recovery or a reset. Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: James Smart <james.smart@broadcom.com> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> 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.