nvme: don't hold nvmf_transports_rwsem for more than transport lookups
Only take nvmf_transports_rwsem when doing a lookup of registered transports, so that a blocking ->create_ctrl doesn't prevent other actions on /dev/nvme-fabrics. Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de> [hch: increased lock hold time a bit to be safe, added a comment and updated the changelog] Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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