linux-kernel - Re: 2.6.25-rc6: CONFIG_USB

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Date:	Mon, 9 Jun 2008 12:50:15 -0700
From:	Greg KH <gregkh@...e.de>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Oliver Neukum <oliver@...kum.org>, Pavel Machek <pavel@...e.cz>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linus Torvalds <torvalds@...uxfoundation.org>,
	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, Jun 09, 2008 at 11:44:21AM -0400, Alan Stern wrote:
> 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.

That sounds reasonable to me.  Oliver or Pavel, care to try this out?

thanks,

greg k-h
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