drm/i915: Cancel pending execlists irq handler upon idling
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.ukReviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
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