[PATCH] NVMe: Avoid interrupt disable during queue init.

[Keith Busch]

On Thu, 21 May 2015, Parav Pandit wrote:
> Avoid diabling interrupt and holding q_lock for the queue
> which is just getting initialized.
>
> With this change, online_queues is also incremented without
> lock during queue setup stage.
> if Power management nvme_suspend() kicks in during queue setup time,
> per nvmeq based q_lock spinlock cannot protect device wide
> online_queues variable anyway.

The q_lock is held to protect polling from reading inconsistent data.