nvme-pci: use atomic bitops to mark a queue enabled
This gets rid of all the messing with cq_vector and the ->polled field by using an atomic bitop to mark the queue enabled or not. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NKeith Busch <keith.busch@intel.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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