linux-kernel - Re: 2.6.25-rc6: CONFIG_USB

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Message-ID: <20080609080052.GA27899@elf.ucw.cz>
Date:	Mon, 9 Jun 2008 10:00:52 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Linus Torvalds <torvalds@...uxfoundation.org>, gregkh@...e.de,
	Andrew Morton <akpm@...uxfoundation.org>,
	kernel list <linux-kernel@...r.kernel.org>,
	Oliver Neukum <oliver@...kum.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: 2.6.25-rc6: CONFIG_USB_PERSIST forced on

Hi!

On Sat 2008-06-07 15:26:12, Linus Torvalds wrote:
> On Sat, 7 Jun 2008, Pavel Machek wrote:
> > Well, not-usb-persists means we force-unplug disks during suspend,
> > after syncing them. Not _too_ bad.
> > 
> > If you unplug disk while hibernated, modify it, and plug it back,
> > youget _silent_ filesystem corruption. I call that bad.
> 
> .. and if the USB layer unplugs them unconditionally while the filesystem 
> is mounted, you _unconditionally_ get a system that doesn't work.

If your device did not loose power during s2ram, it should just work.

There's a tweak you can set in /sys you can set if your device is not
removable, you can set it for non-removable devices that _do_ loose
power.

Besides, it seems to break suspend/resume of printers, and probably
all the drivers that do not have reset_resume() method. That's
actually a regression.

https://bugzilla.novell.com/show_bug.cgi?id=394820

								Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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