linux-kernel - Re: [linux-pm] [PATCH 1/4] export bus

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Date:	Sun, 15 May 2011 16:13:07 +0200
From:	Davide Ciminaghi <ciminaghi@...dd.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	linux-pm@...ts.linux-foundation.org,
	davinci-linux-open-source@...ux.davincidsp.com,
	Raffaele Recalcati <lamiaposta71@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [linux-pm] [PATCH 1/4] export bus_kset

On Fri, May 13, 2011 at 07:11:48PM +0200, Davide Ciminaghi wrote:
> On Thu, May 12, 2011 at 09:28:53PM +0200, Rafael J. Wysocki wrote:
> 
> hi,
> 
> sorry, I missed this message this morning.
> 
> > On Thursday, May 12, 2011, Raffaele Recalcati wrote:
> > > From: Davide Ciminaghi <ciminaghi@...dd.com>
> > 
> > Please explain why you need to export it, what the alternatives are and
> > why you think this approach is better than the alternatives.
> > 
> 
> what I needed to do was walking through the list of registered busses,
> and invoking the bus_added()/bus_removed() callback of a newly registered
> policy. I couldn't find any other simple way to do it.
>
well, I there is another way to do that: adding a function like this
(include/linux/device.h) :

/**
 * run a callback for each registered bus type
 *
 * @data : arg passed to callback
 * @fn : pointer to callback
 */
int for_each_bus(void *data, int (*fn)(struct bus_type *bus, void *data));

which would be similar to the already existing bus_for_each_dev() and
would allow to avoid exporting a global variable.


Regards
Davide
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