Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755270AbZGHVC7 (ORCPT ); Wed, 8 Jul 2009 17:02:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754458AbZGHVCv (ORCPT ); Wed, 8 Jul 2009 17:02:51 -0400 Received: from iolanthe.rowland.org ([192.131.102.54]:45181 "HELO iolanthe.rowland.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1753511AbZGHVCu (ORCPT ); Wed, 8 Jul 2009 17:02:50 -0400 Date: Wed, 8 Jul 2009 17:02:49 -0400 (EDT) From: Alan Stern X-X-Sender: stern@iolanthe.rowland.org To: "Michael S. Zick" cc: Oliver Neukum , Jiri Kosina , , Subject: Re: Null Pointer BUG in uhci_hcd In-Reply-To: <200907081522.22026.lkml@morethan.org> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1532 Lines: 44 On Wed, 8 Jul 2009, Michael S. Zick wrote: > > Like I've been telling you all along, the hardware isn't working. > > > > That sounds very fragile. I'm not sure how to interpret that sentence. If you mean that your system's hardware design isn't good, I agree. If you mean that the kernel shouldn't produce a lot of output when faced with broken hardware, that's not so clear. What else should it do (bearing in mind that the kernel can't tell the hardware is broken)? > > I suspect it's worse than a simple interrupt-routing mistake. > > > > I would not object to your removing that one mistake - that is one less > to contend with. I didn't say there was an interrupt-routing mistake; I said it was _worse_ than an interrupt-routing mistake. > > > > > For more information enable CONFIG_USB_DEBUG and CONFIG_DEBUG_FS, then > > > > > see what's sitting in the usb/uhci/* files in debugfs. > > > > > > > > > > Fours up-time - nothing written to dmesg since boot - > Just the usual hard-lockup. > > Also - something in the combined fix/diagnostic patch > disable any sensing of external usb events. > So I couldn't very well poke devices at it. ;) You should take out those BUG statements. If they ever trigger, they will certainly lock up your system. Alan Stern -- 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/