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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Message-ID: <20160814100102.GA31847@amd>
Date:	Sun, 14 Aug 2016 12:01:02 +0200
From:	Pavel Machek <pavel@....cz>
To:	Tom Yan <tom.ty89@...il.com>
Cc:	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 2016-08-14 17:34:18, Tom Yan 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/*).

Since SATA support was merged, certainly since v2.4, and from way
before /dev/disk/by-id existed.

People may not run udev, and you can't use /dev/disk/by-id on kernel
command line.

								Pavel

> On 14 August 2016 at 17:20, Pavel Machek <pavel@....cz> wrote:
> > Hi!
> >
> >> It seems that in v4.8-rc0, /dev/sdX got reordered, and now USB devices
> >> are probed before SATA drivers. That is pretty anti-social. It
> >> broke my boot on my primary machine, and unfortunately due to BIOS
> >> problems (keyboard does not work when connected through a hub) it is
> >> less fun than it should be.
> >
> > If you know which commit caused the reordering, that would be helpful.
> >
> > v4.1 seems to be ok: SATA disk is sda, as expected.
> >
> > v4.4 seems to be ok: SATA disk is sda, as expected.
> >
> > I'll test v4.6 next.
> >
> > v4.8-rc1: SATA disk is sde, behind USB card readers. Not helpful.
> >
> > Best regards,
> >                                                                         Pavel
> > --
> > (english) http://www.livejournal.com/~pavelmachek
> > (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
> > --
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-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html