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The design of this driver is to do any ramdisk access on the same thread that invoked the queuecommand() call. That is assumed to be user space context. The command duration is implemented by setting the delay with a high resolution timer. The hr timer's callback may well be in interrupt context, but it doesn't touch the ramdisk. So try removing the _irqsave()/_irqrestore() portion on the read-write lock that protects ramdisk access. Link: https://lore.kernel.org/r/20200421151424.32668-5-dgilbert@interlog.com Signed-off-by: Douglas Gilbert <dgilbert@interlog.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.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.