Adding IOCTL for NVMe controller reset

[Busch, Keith]

> I was wondering what's the latest about adding an IOCTL to reset NVMe controller as described in
> this thread:
> http://lists.infradead.org/pipermail/linux-nvme/2015-March/001611.html
> Is there a patch available yet?
> 
> This is very useful to finish a firmware upgrade without power-cycling the host on some old kernel
> where the sysfs method doesn't work.

Yep, it's been committed upstream:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4cc06521ee1f153e0d292413a5bff7bbbdee92d0