drm/i915: Make intel_engine_dump irqsafe
To be useful later, enable intel_engine_dump() to be called from irq context (i.e. using saving and restoring irq start rather than assuming we enter with irqs enabled). Signed-off-by:Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by:
Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180518090212.5349-1-chris@chris-wilson.co.uk
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dd0cf235
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