linux-kernel - Re: [1/4] 2.6.23-rc6: known regressions

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Message-ID: <46E9395F.2090300@rtr.ca>
Date:	Thu, 13 Sep 2007 09:21:35 -0400
From:	Mark Lord <lkml@....ca>
To:	Greg KH <gregkh@...e.de>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Oliver Neukum <oneukum@...e.de>,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Markus <lists4me@....de>, Jeff Chua <jeff.chua.linux@...il.com>,
	"Antonino A. Daplas" <adaplas@...il.com>,
	linux-alpha@...r.kernel.org,
	Stefan Becker <Stefan.Becker@...ia.com>,
	Andi Kleen <ak@...e.de>, Dave Jones <davej@...hat.com>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jakub Jelinek <jakub@...hat.com>,
	Jeff Dike <jdike@...ux.intel.com>,
	user-mode-linux-devel@...ts.sourceforge.net,
	Adrian Bunk <bunk@...nel.org>
Subject: Re: [1/4] 2.6.23-rc6: known regressions

Greg KH wrote:
> On Wed, Sep 12, 2007 at 10:50:26PM -0400, Mark Lord wrote:
>> Michal Piotrowski wrote:
>>> Hi all,
>>> Here is a list of some known regressions in 2.6.23-rc6.
>> ...
>>
>> Missing from the list:
>>
>> USB "autosuspend" feature (new in 2.6.23) breaks *lots* of devices.
>> Many have since been blacklisted in one-at-a-time discovery patches,
>> but that's really just the tip of the iceberg.
>>
>> This "feature" breaks a TON of user-visible things,
>> mostly USB storage devices (USB drives/pens, digicams, etc..).
>>
>> The functionality is broken for just too much stuff,
>> and needs to either be reverted or defaulted to "off" rather than "on".
> 
> Ok, after conferring with Oliver this morning, I think the best solution
> here is to both revert the usb-storage suspend patch as it has some
> basic problems that can cause data loss, _and_ add the change to the
> kernel that by default disables autosuspend on all USB devices except
> hubs.

Sounds like a sane approach.

Hopefully the kinks can be worked out in time for a reattempt in 2.6.24.
I understand how important this stuff is for battery powered devices,
but it just doesn't appear to be ready yet.

Cheers
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