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During normal driver unload we attempt to disable GuC communication while it is currently stopped. This results in a nop'd call to intel_guc_ct_disable within guc_disable_communication because stop/disable rely on the same flag to prevent further comms with CT. We can avoid the call to disable and still leave communication in a satisfactory state by extracting a set of shared steps from stop/disable. This set can include guc_disable_interrupts as we do not require the single caller of guc_stop_communication to be atomic: "drm/i915/selftests: Fixup atomic reset checking". This situation (stop -> disable) only occurs during intel_uc_fini_hw, so during fini, call guc_disable_communication only if currently enabled. The symmetric calls to enable/disable remain unmodified for all other scenarios. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=110943 Signed-off-by: Fernando Pacheco <fernando.pacheco@intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Michal Wajdeczko <michal.wajdeczko@intel.com> Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20190829174154.14675-1-fernando.pacheco@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.