Comment 7 for bug 1626679

A couple issues here. The nvme driver was ported from 4.5, but the block layer was based on 4.4, so there was a mismatch in how to handle timeouts. That was this launchpad:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1597908

But also, there is a bug handling legacy IRQ that only affected the 4.5 version of this driver, and that was fixed in commit: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit?id=a5229050b69cfffb690b546c357ca5a60434c0c8