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In cs_dsp_debugfs_read_controls_show() take the pwr_lock mutex around the list walk. This protects against debugfs returning a partial set of new controls if those controls are being added to the list while it is being walked. Controls are never deleted from this list, and are only added to the end of the list. So there was never a danger of following a stale pointer to garbage. The worst case was that the printed list is truncated if it saw an entry that was the list end just before a new entry was appended to the list. With the original code, the truncated list from the debugfs could show only _some_ of the new entries. This could be confusing because it appears that some new entries are missing. Adding the mutex means that the debugfs read provides an atomic view. Either it shows the old content before any of the new controls were added; or it shows the new content after all the new controls are added. Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com> Link: https://patch.msgid.link/20251127113238.1251352-1-rf@opensource.cirrus.com Signed-off-by: Mark Brown <broonie@kernel.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 reStructuredText 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.