linux-kernel - Re: [PATCH 2/3] struct class sem to mutex converting

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Date:	Wed, 14 May 2008 08:57:29 -0700
From:	Greg KH <greg@...ah.com>
To:	Dave Young <hidave.darkstar@...il.com>
Cc:	gregkh@...e.de, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 2/3] struct class sem to mutex converting

On Wed, May 14, 2008 at 09:34:13AM +0800, Dave Young wrote:
> On Wed, May 14, 2008 at 6:01 AM, Greg KH <greg@...ah.com> wrote:
> > On Fri, May 09, 2008 at 03:22:31PM +0800, Dave Young wrote:
> >  > The class_device is already removed, so do the class->sem to mutex converting.
> >
> >  Are you sure this will work?  Have you tried running lockdep to verify
> >  that there are no problems here?  People have tried this in the past
> >  with devices and I don't think it will work here either :(
> 
> Yes, lockdep doesn't generate warnings on my side.

I think Andrew's recent post to linux-scsi proves this is incorrect :)

> I ever wanted to do the conversion, please see:
> http://lkml.org/lkml/2008/1/12/49
> 
> The result is that device sem2mutex is not possible now, but class
> sem2mutex is possible.  After the class_device removing, all the
> class->sem usage exist in class.c except for i2c part.
> 
> So I make i2c to use class_for_each_device api, so we can do the
> class->sem conversion.

Ah, I didn't realize that the i2c patch was required.  Let me know when
Jean takes that patch in his tree.

thanks,

greg k-h
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