linux-kernel - Re: 2.6.27-rc4: 90% system time because of khubd, unable to reboot

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Date:	Sat, 23 Aug 2008 10:27:59 +0400
From:	Andrey Borzenkov <arvidjaar@...l.ru>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	linux-usb@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Greg Kroah-Hartman" <gregkh@...e.de>
Subject: Re: 2.6.27-rc4: 90% system time because of khubd, unable to reboot

On Friday 22 August 2008, Alan Stern wrote:
> On Fri, 22 Aug 2008, Andrey Borzenkov wrote:
> 
> > It looks even funnier. Right now I am running with commits
> > 38b375d9610e2467cb793a84d17c6f65e44cdb39 *and*
> > e872154921a6b5256a3c412dd69158ac0b135176 reverted. I.e. this should be
> > the state which hopelessly failed in 2.6.26-rc. It seems to be doing
> > quite well now in 2.6.27-rc.
> > 
> > "git revert e872154921a6b5256a3c412dd69158ac0b135176" gives me this
> > one liner patch:
> > 
> > commit f3cf9ad86ee76077d1c6be9af7d197aa13ccdff9
> > Author: Andrey Borzenkov <arvidjaar@...l.ru>
> > Date:   Fri Aug 22 21:15:26 2008 +0400
> > 
> >     Revert "USB: don't explicitly reenable root-hub status interrupts"
> > 
> >     This reverts commit e872154921a6b5256a3c412dd69158ac0b135176.
> > 
> > diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
> > index 107e1d2..d30f822 100644
> > --- a/drivers/usb/core/hub.c
> > +++ b/drivers/usb/core/hub.c
> > @@ -3086,6 +3086,11 @@ static void hub_events(void)
> >                 if (!hdev->parent && !hub->busy_bits[0])
> >                         usb_enable_root_hub_irq(hdev->bus);
> > 
> > +               /* If this is a root hub, tell the HCD it's okay to
> > +                * re-enable port-change interrupts now. */
> > +               if (!hdev->parent && !hub->busy_bits[0])
> > +                       usb_enable_root_hub_irq(hdev->bus);
> > +
> >  loop_autopm:
> >                 /* Allow autosuspend if we're not going to run again */
> >                 if (list_empty(&hub->event_list))
> > 
> > Either my git tree is completely botched or most parts were already reverted
> > before.
> 
> _Something_ is completely botched.  e872154 is much bigger than what 
> you quoted above.
> 

Oh, no need to be *that* polite telling me I'm idiot.

> The commit you really want to revert is
> 09ca8adbe9f724a7e96f512c0039c4c4a1c5dcc0.
> 

Sure. Mouse slipped doing copy'n'paste :)

If you are still interested in this strange effect of lone 38b375d9,
I could run some tests; just tell me what is needed.

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