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32a9ae415b
When a superpipe process that makes use of virtual LUNs is terminated or killed abruptly, there is a possibility that the cxlflash driver could hang and deprive other operations on the adapter. The release fop registered to be invoked on a context close, detaches every LUN associated with the context. The underlying service to detach the LUN assumes it has been called with the read semaphore held, and releases the semaphore before any operation that could be time consuming. When invoked without holding the read semaphore, an opportunity is created for the semaphore's count to become negative when it is temporarily released during one of these potential lengthy operations. This negative count results in subsequent acquisition attempts taking forever, leading to the hang. To support the current design point of holding the semaphore on the ioctl() paths, the release fop should acquire it before invoking any ioctl services. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.