linux-kernel - Re: USB deadlock after resume

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Message-Id: <200711211615.14829.oliver@neukum.org>
Date:	Wed, 21 Nov 2007 16:15:14 +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:
> > Which URB is usb_kill_urb() called for?
> >
> 
> it's the usb_control_message which calls usb_kill_urb if I haven't got
> it wrong. (if you're looking for some other information please let me
> know)
> Although, I got a bit further with it. The error seems to happen
> earlier already.
> If I load the driver, and do not access the device after suspending
> all usb_control commands fail with -71 eproto.

A timeout. You should add the RESET_RESUME quirk for your device.
usb_reset_device() from resume() is not a good idea.

	Regards
		Oliver

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