Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760151Ab3CHBqw (ORCPT ); Thu, 7 Mar 2013 20:46:52 -0500 Received: from mail-yh0-f42.google.com ([209.85.213.42]:34029 "EHLO mail-yh0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754041Ab3CHBqu (ORCPT ); Thu, 7 Mar 2013 20:46:50 -0500 Date: Fri, 8 Mar 2013 09:39:23 +0800 From: Greg Kroah-Hartman To: Josh Boyer Cc: Jiri Slaby , linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: 8250.nr_uarts broken in 3.7 Message-ID: <20130308013923.GA12474@kroah.com> References: <20130307185642.GF13719@hansolo.jdub.homelinux.org> <5138E56B.6090308@suse.cz> <20130307191005.GH13719@hansolo.jdub.homelinux.org> <20130307211426.GI13719@hansolo.jdub.homelinux.org> <20130307231242.GC4280@kroah.com> <20130308010140.GJ13719@hansolo.jdub.homelinux.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130308010140.GJ13719@hansolo.jdub.homelinux.org> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2448 Lines: 55 On Thu, Mar 07, 2013 at 08:01:40PM -0500, Josh Boyer wrote: > On Fri, Mar 08, 2013 at 07:12:42AM +0800, Greg Kroah-Hartman wrote: > > On Thu, Mar 07, 2013 at 04:14:27PM -0500, Josh Boyer wrote: > > > On Thu, Mar 07, 2013 at 02:10:05PM -0500, Josh Boyer wrote: > > > > On Thu, Mar 07, 2013 at 08:07:23PM +0100, Jiri Slaby wrote: > > > > > On 03/07/2013 07:56 PM, Josh Boyer wrote: > > > > > > commit 835d844d1a28efba81d5aca7385e24c29d3a6db2 > > > > > > Author: Sean Young > > > > > > Date: Fri Sep 7 19:06:23 2012 +0100 > > > > > > > > > > > > 8250_pnp: do pnp probe before legacy probe > > > > > > > > > > > > but that is simply moving code around. > > > > > > > > > > Hi, not quite. Does it still happen when you revert that one on the top > > > > > of 3.[789]*? > > > > > > > > That was going to be my first attempt. I'll let you know how it goes. > > > > > > Yes, reverting just 835d844d1 on top of 3.7.0 fixes it. I also see why > > > now. That commit changed the module name from 8250 to 8250_core in the > > > makefile, so clearly 8250.nr_uarts = 16 isn't going to get parsed. > > > Adding 8250_core.nr_uarts = 16 seems to work fine. This wasn't > > > immediately obvious because the whole thing is built-in and not a > > > module. Thankfully, looking in /sys/modules/ still works and that > > > showed up pretty clearly. > > > > > > So I guess this isn't really a break in functionality as much as it's a > > > driver rename. Not sure if it's worth fixing in some form or not. > > > > Yes it needs to be fixed, we shouldn't break userspace stuff like that. > > Patches gladly accepted. > > OK... well I don't think renaming it back to 8250 is going to actually > work. It's already been renamed for 2 releases now, and a renaming > isn't appropriate for 3.8.y. > > I don't remember exactly, but I don't think simply adding a modalias to > 8250 will work either. > > So basically, the only way to fix this that I can see is to create a > new, additional module parameter or something similar that parses > "8250.nr_uarts". Is that what you had in mind? I think that's the only way we can properly solve this, so yes, that would be good. thanks, greg k-h -- 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/