[PATCH] NVMe: Change nvme_enable_ctrl behavior and track CC

[Keith Busch]

On Fri, 20 Jun 2014, Dan McLeran wrote:
> nvme_probe as it is written today essentially clears out any the shutdown 
> bits during enable. If you unload/reload the nvme module you'll see that the 
> normal shutdown bits are set before the controller gets enabled. The 
> nvme_remove path calls nvme_shutdown_ctrl but not nvme_disable_ctrl. Maybe 
> the nvme_probe path should always disable the controller first before 
> enabling to ensure we're starting clean?

But we already do that. We probably want nvme_disable_ctrl to also clear
the CC.SHN bits in addition to CC.EN, though.