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

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Message-Id: <201105180104.56252.rjw@sisk.pl>
Date:	Wed, 18 May 2011 01:04:56 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Davide Ciminaghi <ciminaghi@...dd.com>
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 Sunday, May 15, 2011, Davide Ciminaghi wrote:
> 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.

I really think you'd simply need to browse all devices, like the core PM
code in drivers/base/power/main.c.  You can use dpm_list for that just fine.

Thanks,
Rafael
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