nvme-pci: use a flag for polled queues
A negative value for the cq_vector used to mean the queue is either disabled or a polled queue. However, we have a queue enabled flag, so the cq_vector had been serving double duty. Don't overload the meaning of cq_vector. Use a flag specific to the polled queues instead. Signed-off-by: NKeith Busch <keith.busch@intel.com> Reviewed-by: NSagi Grimberg <sagi@grimberg.me> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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