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 16:14:59 +0200
From:	Oliver Neukum <oneukum@...e.com>
To:	Tom Yan <tom.ty89@...il.com>
Cc:	David Lang <david@...g.hm>,
	james harvey <jamespharvey20@...il.com>,
	Tejun Heo <tj@...nel.org>, regressions@...mhuis.info,
	gregkh@...uxfoundation.org, hdegoede@...hat.com,
	Alan Stern <stern@...land.harvard.edu>,
	Pavel Machek <pavel@....cz>, linux-ide@...r.kernel.org,
	kernel list <linux-kernel@...r.kernel.org>,
	linux-usb@...r.kernel.org
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 at 10:53 +0000, Tom Yan wrote:
> Btw, why hasn't this been CC'd to linux-scsi at the very least? The
> SCSI disk (sd) driver is obviously the sociopath here. It should
> really differentiate disks from libata and usb-storage/uas, and wait
> for at least a minute to see if there's gonna be an ATA drive popping
> up before enumerating disks from the latter. Sociopaths like me that
> put the root filesystem on an UAS drive should really be ignored.
> Wait, there's NVMe! Problem solved.

We most certainly cannot introduce such a delay. If this really
must be done, we need synchronisation primitives between the
subsystemes, or we need stable names in kernel space.

	Regards
		Oliver