skd: Convert several per-device scalar variables into atomics
Convert the per-device scalar variables that are protected by the queue lock into atomics such that it becomes safe to access these variables without holding the queue lock. Signed-off-by: NBart Van Assche <bart.vanassche@wdc.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.de> Cc: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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