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    SubjectRe: [linux-pm] [PATCH 1/4] export bus_kset
    Date
    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@gnudd.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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