Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761445AbXKUOwt (ORCPT ); Wed, 21 Nov 2007 09:52:49 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1760836AbXKUOwk (ORCPT ); Wed, 21 Nov 2007 09:52:40 -0500 Received: from ug-out-1314.google.com ([66.249.92.174]:19949 "EHLO ug-out-1314.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760825AbXKUOwj (ORCPT ); Wed, 21 Nov 2007 09:52:39 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=pjdpexhWc0t9qDUtc7hzuQfXZkCw8nLDSFLbtm9bvZHq02BcxFsy8jn2nJDQaJiSZ9GkuEGZHcY20/pf2aoauJSwHWfQRu9zBOOnUvaPlhE8zE6ul83KyHBImT91skz8LenDluLN5F9EE7yfWSpov2XeUJP6lbYJlyUcB+IYMwI= Message-ID: Date: Wed, 21 Nov 2007 15:52:37 +0100 From: "Markus Rechberger" To: "Oliver Neukum" Subject: Re: USB deadlock after resume Cc: "Mark Lord" , linux-kernel@vger.kernel.org, linux-usb-devel@lists.sourceforge.net, "Laurent Pinchart" In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <200711211246.39441.oliver@neukum.org> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2716 Lines: 66 On 11/21/07, Markus Rechberger wrote: > On 11/21/07, Markus Rechberger wrote: > > On 11/21/07, Oliver Neukum wrote: > > > Am Mittwoch 21 November 2007 schrieb Markus Rechberger: > > > > On 11/21/07, Markus Rechberger wrote: > > > > > On 11/21/07, Mark Lord 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? > > > > > > > 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. > > > > Reloading the driver doesn't help at tht point, only reconnecting the > > device does. > > > > The data is transfered using bulk transfer. > > > > Do you know any good way for performing a softreset within the driver? > The video application should get a continuous datastream after > resuming the notebook, so the driver shouldn't be unloaded. > The driver also keeps a list of previous camera settings which should > be set up again after resuming. Stopping the video application and > reattaching the device using ACPI (this board supports reconnecting > the device using ACPI) should be avoided. > ok usb_reset_device() did the job after resuming. First problem solved. Markus - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/