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036695a65e
When the Comedi "detach" handler is called, it is possible that an extra A/D conversion (triggered during termination of a Comedi asynchronous command) is still in progress. In that case, the FINISH bit in the Status register will eventually get set and there will be stale data waiting to be read from the A/D Data register. The interrupt handler will also be called if still connected at the time. That should all be mostly harmless, but it would be better to wait for any such conversion to complete and clear any stale data during the "detach". Add a custom "detach" handler `dt2814_detach()` to do that if an interrupt handler has been set up. (There is no need to do it if no interrupt handler was set up because Comedi asynchronous command support is disabled in that case.) Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Link: https://lore.kernel.org/r/20210301165757.243065-7-abbotti@mev.co.uk Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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.