nvme: synchronize access to ctrl->namespaces
Currently traversal and modification of ctrl->namespaces happens completely unsynchronized, which can be fixed by the addition of a simple mutex. Note: nvme_dev_ioctl will be handled in the next patch. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NSagi Grimberg <sagig@mellanox.com> Acked-by: NKeith Busch <keith.busch@intel.com> Signed-off-by: NJens Axboe <axboe@fb.com>
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