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[Why] If no free pipes are available, acquire_first_split_pipe is called to get a pipe to use. This call may alter the ordering of the pipes in the list so that, for example, the tail pipe changes. If acquire_first_split_pipe returns the tail pipe, we'll have free_pipe == tail_pipe. What tail_pipe refers to is not the current tail_pipe, but what was previously the tail pipe - i.e. prior to the call to acquire_first_split_pipe The logic that follows will link free_pipe to the tail pipe, referring to the current tail pipe. However, since tail_pipe is cached from before the call to acquire_first_split_pipe, the wrong tail pipe will be used, and it will end up being linked to itself, creating a loop that, if traversed, will result in a soft hang. [How] Do not cache the tail pipe. Instead, check the tail pipe after the call to acquire_first_split_pipe is made. Signed-off-by: Josip Pavic <Josip.Pavic@amd.com> Reviewed-by: Aric Cyr <Aric.Cyr@amd.com> Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.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.