linux-kernel - Re: USB deadlock after resume

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Message-Id: <200711211246.39441.oliver@neukum.org>
Date:	Wed, 21 Nov 2007 12:46:39 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	"Markus Rechberger" <mrechberger@...il.com>
Cc:	"Mark Lord" <lkml@....ca>, linux-kernel@...r.kernel.org,
	linux-usb-devel@...ts.sourceforge.net,
	"Laurent Pinchart" <laurentp@...-semaphore.com>
Subject: Re: USB deadlock after resume

Am Mittwoch 21 November 2007 schrieb Markus Rechberger:
> On 11/21/07, Markus Rechberger <mrechberger@...il.com> wrote:
> > On 11/21/07, Mark Lord <lkml@....ca> wrote:
> > > Markus Rechberger wrote:
> > > > Hi,
> > > >
> > > > I'm looking at the linux uvc driver, and noticed after resuming my
> > > ..
> > >
> > > Pardon me.. what is the "uvc" driver?  Which module/source file is that?
> > >
> >
> > http://linux-uvc.berlios.de/ it's not yet included in the kernel
> > sources although many distributions already ship it.
> > A "dry" run putting the device into sleep mode works fine (I added a
> > proc interface for calling those suspend/resume function).
> >
> 
> it's not just usb_set_interface that hangs actually.
> It seems to hang at
> 
> wait_event(usb_kill_urb_queue, atomic_read(&urb->use_count) == 0);
> 
> in drivers/usb/core/urb.c after resuming. I disabled access to the usb
> subsystem in the uvc driver, although connecting any other usb storage
> fails too, just at the same point.

Which URB is usb_kill_urb() called for?

	Regards
		Oliver

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