linux-kernel - Re: 2.6.25-rc6: CONFIG_USB

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Message-ID: <Pine.LNX.4.44L0.0806091142390.2943-100000@iolanthe.rowland.org>
Date:	Mon, 9 Jun 2008 11:44:21 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Oliver Neukum <oliver@...kum.org>
cc:	Pavel Machek <pavel@...e.cz>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linus Torvalds <torvalds@...uxfoundation.org>,
	<gregkh@...e.de>, Andrew Morton <akpm@...uxfoundation.org>,
	kernel list <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: 2.6.25-rc6: CONFIG_USB_PERSIST forced on

On Mon, 9 Jun 2008, Oliver Neukum wrote:

> Am Montag 09 Juni 2008 17:03:10 schrieb Alan Stern:
> > On Mon, 9 Jun 2008, Pavel Machek wrote:
> > 
> > > 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
> > 
> > The right way to fix this is to add reset_resume to the printer driver.  
> 
> reset_resume() is supposed to restore all state. The printer driver does
> not know which state a printer is in, except for the trivial case of the
> printer not being in use, as it doesn't know the meaning of the data
> going to the printer.
> 
> You might argue that you deserve what you get when you hibernate
> while printing, but then it makes no sense to implement it anyhow,
> disconnection and reconnection work just as well and are cleaner.
> The same is true for many devices.

In which case the correct approach is the second one I mentioned (which 
you omitted in your reply): Make usbcore unbind drivers that don't 
support reset_resume.

Alan Stern

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