Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759480AbXKUOhb (ORCPT ); Wed, 21 Nov 2007 09:37:31 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754815AbXKUOhX (ORCPT ); Wed, 21 Nov 2007 09:37:23 -0500 Received: from nz-out-0506.google.com ([64.233.162.227]:10073 "EHLO nz-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754404AbXKUOhW (ORCPT ); Wed, 21 Nov 2007 09:37:22 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=qnlf9XlNNc9cPrp1Lkdt7Toz4nUqaBOD2nAJ54Nnv8Z2v3rZ/UFVQrK4zw/tkecWeg5RdmN0BEYSRTNy08s8J1YFoYJ/mLSgcXymeoiaDwfvKBq4pc9hT9y9kBbFuoj80Y5mzKFfxiKM9u4u9R68rND4JYatyFZvoM8BlkRxZg4= Message-ID: Date: Wed, 21 Nov 2007 15:37:20 +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: <200711211246.39441.oliver@neukum.org> 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: 1879 Lines: 51 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. 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/