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`external_ai_queue_in_use()` is supposed to return 1 if the external channel sequencer is in use by an AI command, else return 0. If the "read" subdevice (which is the AI subdevice) is not busy then no AI command is running so the external channel sequencer is not in use, so the function should return 0. Unfortunately, the function's "read" subdevice busy test is inverted, so the function always returns 0 when the "read" subdevice is busy. Worse, if the "read" subdevice is not busy the subsequent call to `use_internal_queue_6xxx()` results in a null pointer dereference if a previous AI command used a channel list with a length greater than 1. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.