linux-kernel - Re: [linux-usb-devel] 2.6.18-rc6-mm1 (-mm2): ohci resume problem

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Date:	Thu, 14 Sep 2006 18:19:58 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	David Brownell <david-b@...bell.net>,
	Andrew Morton <akpm@...l.org>,
	Mattia Dongili <malattia@...ux.it>,
	Robert Hancock <hancockr@...w.ca>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	USB development list <linux-usb-devel@...ts.sourceforge.net>
Subject: Re: [linux-usb-devel] 2.6.18-rc6-mm1 (-mm2): ohci resume problem

On Thu, 14 Sep 2006, Rafael J. Wysocki wrote:

> > As I see it, there are two ways to resolve the problem.  The easiest is to
> > rip out the autosuspend stuff from ohci-hcd entirely.  When my generic
> > autosuspend patches are accepted, the HCD-specific stuff won't be needed
> > so much.  This has the disadvantage that the root hub will never get
> > suspended if CONFIG_USB_SUSPEND isn't set.  On the other hand, this is how 
> > ehci_hcd works already.
> 
> This isn't a big deal as far as I'm concerned, but I think that dependancy
> will have to be reflected by some Kconfig rules (eg. if CONFIG_USB_SUSPEND
> gets selected automatically if CONFIG_PM is set).

Ultimately the best thing will be for CONFIG_USB_SUSPEND simply to 
disappear.  That's the long-term goal.  It was never intended to be much 
more than a stop-gap setting, for use while the USB suspend/resume 
routines were under development and not entirely reliable.

> > I don't know if this is feasible with OHCI.  For now, I'll include a patch 
> > that takes the first approach and disables the ohci-hcd autosuspend 
> > entirely.  I think it will solve your problem above.
> 
> Yes it does.
> 
> Now I'm able to suspend/resume several times in a row with both
> ohci and ehci hcds loaded all the time.  Thanks a lot!

You're welcome.

I'll wait to hear Dave's comments before submitting this.

Alan Stern

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