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Due to the slight asynchronicity in handling the execlists interrupts (i.e. we defer the work to a handler that may consume more than one interrupt event), when the engine is idle we may still have an irq tasklet queued (especially when it has been deferred to a ksoftirqd). At the beginning of the tasklet, we assert that we do hold a device wakeref for the access we are about to perform. This assumes that when we idle and release the GT wakeref, all execlists work has been completed (since the elsp tracking says the hw is idle). However, there may still be a tasklet queued, so as we mark the engine idle, also cancel any pending tasklet. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170627152510.28589-1-chris@chris-wilson.co.uk Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.