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ec9025e5d3
Current trace implementation gets out of sync when sof device is put to suspend. The debugfs file handle is kept open, but firmware will reset its state. After resume, debugfs client's read offset will not be synchronized to firmware and this may result in traces read in incorrect order and/or stale data being read after resume. Add logic to signal end-of-file to read() when firmware tracing has ended, and all trace data has been read. This allows debugfs client to capture all trace data, and reopen the trace file to ensure proper synchronization with firmware after reopening the node. Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.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 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.