linux-kernel - Re: [PATCH] cpci_hotplug: Convert to use the kthread API

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Date:	Thu, 10 May 2007 14:29:29 -0400 (EDT)
From:	Scott Murray <scottm@...anetworks.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Christoph Hellwig <hch@...radead.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	containers@...ts.osdl.org, Oleg Nesterov <oleg@...sign.ru>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	kristen.c.accardi@...el.com
Subject: Re: [PATCH] cpci_hotplug: Convert to use the kthread API

On Wed, 9 May 2007, Andrew Morton wrote:

> On Mon, 7 May 2007 14:18:29 -0400 (EDT)
> Scott Murray <scottm@...anetworks.com> wrote:
> 
> > On Fri, 4 May 2007, Christoph Hellwig wrote:
> > 
> > > On Fri, Apr 27, 2007 at 06:07:49PM -0400, Scott Murray wrote:
> > > > Sorry, it took me a few days to get to testing this out.  It looks good,    
> > > > but I had to make a couple of tweaks to avoid a hang when rmmod'ing a
> > > > board driver.  The board drivers do:
> > > > 
> > > > cpci_hp_stop()
> > > > cpci_hp_unregister_controller(controller)
> > > > 
> > > > to shutdown, and the check in cpci_hp_unregister_controller if the thread
> > > > is running wasn't working due to a bit too much code being excised.  The
> > > > result was kthread_stop being called twice, which hangs.  I've indicated 
> > > > my changes to avoid this inline below.
> > > 
> > > Can you forward the patches with your fix to Andrew to make sure he
> > > picks it up?
> > 
> > Andrew, here is my updated version of Christoph's kthread conversion 
> > patch for cpci_hotplug.  I've CC'ed Kristen so she won't be surprised
> > when this eventually goes to mainline.
> 
> A patch in this area would normally go
> 
> 	you->kristen->mainline
>                 |
>                 v
>                -mm
> 
> or
> 
> 	you->kristen->greg->mainline
>                         |
>                         v
>                        -mm
> 
> or
> 
> 	you->me->greg->mainline		(gets an Acked-by somewhere)
>                    |
>                    v
>                   -mm
> 
> or
> 
> 	you->kristen->Len->mainline
>                        |
>                        v
>                       -mm
> 
> or something else.

My apologies, it wasn't entirely clear to me that that was happening with 
the other kthread conversion patches in the big batch, so I didn't follow 
the normal procedure.  I'll try to stick to the regular flow up the chain
going forward.

Scott


-- 
Scott Murray
SOMA Networks, Inc.
Toronto, Ontario
e-mail: scottm@...anetworks.com
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