linux-kernel - Re: Regression - SATA disks behind USB ones on v4.8-rc1, breaking boot. [Re: Who reordered my disks (probably v4.8-rc1 problem)]

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Date:	Sun, 14 Aug 2016 17:09:05 +0100
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Tom Yan <tom.ty89@...il.com>
Cc:	Pavel Machek <pavel@....cz>,
	kernel list <linux-kernel@...r.kernel.org>,
	jamespharvey20@...il.com, regressions@...mhuis.info,
	hdegoede@...hat.com, Tejun Heo <tj@...nel.org>,
	linux-ide@...r.kernel.org, gregkh@...uxfoundation.org,
	linux-usb@...r.kernel.org, oliver@...kum.org,
	stern@...land.harvard.edu
Subject: Re: Regression - SATA disks behind USB ones on v4.8-rc1, breaking
 boot. [Re: Who reordered my disks (probably v4.8-rc1 problem)]

On Sun, 14 Aug 2016 17:34:18 +0800
Tom Yan <tom.ty89@...il.com> wrote:

> Since when it is expected that SATA disks will always be probed before
> USB disks? We can't guarantee that even if we make sure all ata
> drivers are loaded before usb-storage/uas. That's why we need
> consistent namings (e.g. /dev/disk/by-id/*).

It hasn't. It isn't even true on older kernels and can depend on all
sorts of things. I have boxes that will put the USB first, and a 10
second google search says I'm not alone

http://serverfault.com/questions/322946/ensure-usb-disk-is-never-sda-even-when-booting-from-it

So your "regression" goes back to at least 2011.

Alan