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In the rare but possible scenario where we are in the midst of multiple GuC error-capture (and engine reset) events and the user also triggers a forced full GT reset or the internal watchdog triggers the same, intel_guc_submission_reset_prepare's call to flush_work(&guc->ct.requests.worker) can cause the G2H message handler to trigger intel_guc_capture_store_snapshot upon receiving new G2H error-capture notifications. This can happen despite the prior call to disable_submission(guc);. However, there's no race-free way for intel_guc_capture_store_snapshot to know that we are in the midst of a reset. That said, we can never dynamically allocate the output nodes in this handler. Thus, we shall pre-allocate a fixed number of empty nodes up front (at the time of ADS registration) that we can consume from or return to an internal cached list of nodes. Signed-off-by: Alan Previn <alan.previn.teres.alexis@intel.com> Reviewed-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com> Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220321164527.2500062-12-alan.previn.teres.alexis@intel.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.