drm/i915/guc: Skip port assign on first iteration of GuC dequeue
If port[0] is occupied and we're trying to dequeue request from different context, we will inevitably hit BUG_ON in port_assign. Let's skip it - similar to what we're doing in execlists counterpart. Fixes: 77f0d0e9 ("drm/i915/execlists: Pack the count into the low bits of the port.request") Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Michał Wajdeczko <michal.wajdeczko@intel.com> Cc: Mika Kuoppala <mika.kuoppala@intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Signed-off-by: NMichał Winiarski <michal.winiarski@intel.com> Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk> Link: http://patchwork.freedesktop.org/patch/msgid/20170523102400.9614-2-michal.winiarski@intel.comSigned-off-by: NChris Wilson <chris@chris-wilson.co.uk>
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