From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758489Ab3KYObP (ORCPT ); Mon, 25 Nov 2013 09:31:15 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:46118 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756167Ab3KYObM (ORCPT ); Mon, 25 Nov 2013 09:31:12 -0500 Date: Mon, 25 Nov 2013 06:31:54 -0800 From: Greg KH To: Shuah Khan Cc: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" , "shuahkhan@gmail.com" Subject: Re: 3.12.1 Virt dev invalid for slot_id 0x1 Message-ID: <20131125143154.GA4003@kroah.com> References: <528E975B.5010200@samsung.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <528E975B.5010200@samsung.com> User-Agent: Mutt/1.5.22 (2013-10-16) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Nov 21, 2013 at 04:29:31PM -0700, Shuah Khan wrote: > I started seeing the following on my Samsung Series on 3.12.1 > > Is this bad? Looks like the following WARN_ON is firing: > > drivers/usb/host/xhci.c: > > if (WARN_ON(!virt_dev)) { > /* > * In plug/unplug torture test with an NEC controller, > * a zero-dereference was observed once due to virt_dev > = 0. > * Print useful debug rather than crash if it is > observed again! > */ > xhci_warn(xhci, "Virt dev invalid for slot_id 0x%x!\n", > udev->slot_id); > return -EINVAL; > } I suggest sending this to the linux-usb@vger mailing list and cc: the xhci author/maintainer so they are aware of this. thanks, greg k-h