linux-kernel - Re: [PATCH] driver core: check bus->match without holding device lock

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Date:	Wed, 25 Mar 2009 11:23:30 +0100 (CET)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	Ming Lei <tom.leiming@...il.com>
cc:	kay.sievers@...y.org, Greg KH <greg@...ah.com>,
	linux-kernel@...r.kernel.org, arjan@...ux.intel.com
Subject: Re: [PATCH] driver core: check bus->match without holding device
 lock

On Wed, 25 Mar 2009, Ming Lei wrote:

> >> > Now, without .match() no probing is done. Is this an intended change and
> >> > soc-camera has to be fixed or is this a bug?
> >>
> >> It is not a driver-core bug, and soc-camera should be fixed.
> >
> > So, you're saying this used to be a bug and it has been fixed by this
> > patch? Then why isn't this mentioned in the commit message? The commit
> > text seems to suggest, that this patch shouldn't introduce any change in
> > behaviour, but it does. So, before .match == NULL lead to .probe() being
> > called, and now it doesn't anymore?
> 
> Where is soc-camera  driver in kernel tree?

drivers/media/video/soc_camera.c

> Which bus  is soc-camera device (driver) attached to ?

camera bus.

> Why doesn't soc-camera  driver  have a match method?

Why should it? Because there is only one driver on this bus by definition 
(and I only register a device on the bus when I find a match between a 
device and its parent / driver).

What I in any case see wrong with this patch, is that it _silently_ 
changes kernel behaviour without even mentioning it in the commit log!

Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
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