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[ Upstream commit 0475a8dcbcee92a5d22e40c9c6353829fc6294b8 ] When a request times out in a LIVE state, we simply trigger error recovery and let the error recovery handle the request cancellation, however when a request times out in a non LIVE state, we make sure to complete it immediately as it might block controller setup or teardown and prevent forward progress. However tearing down the entire set of I/O and admin queues causes freeze/unfreeze imbalance (q->mq_freeze_depth) because and is really an overkill to what we actually need, which is to just fence controller teardown that may be running, stop the queue, and cancel the request if it is not already completed. Now that we have the controller teardown_lock, we can safely serialize request cancellation. This addresses a hang caused by calling extra queue freeze on controller namespaces, causing unfreeze to not complete correctly. 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.