Re: [RFC] drivers/base: Add bus_register_notifier_alldev() variant

[Grant Likely <grant.likely@secretlab.ca>]

On Wed, Mar 11, 2009 at 10:26 AM, Greg KH <gregkh@suse.de> wrote:
> On Fri, Mar 06, 2009 at 09:10:19AM -0700, Grant Likely wrote:
>> From: Grant Likely <grant.likely@secretlab.ca>
>>
>> bus_register_notifier_alldev() is a variation on bus_register_notifier()
>> which also triggers the notifier callback for devices already on the bus
>> and already bound to drivers.
>>
>> This function is useful for the case where a driver needs to get a
>> reference to a struct device other than the one it is bound to and
>> it is not known if the device will be bound before or after this
>> function is called. =A0For example, an Ethernet device connected to
>> a PHY that is probed separately.
>
> Can't you just walk the list of all devices already on the bus to get
> "notified" of them, and then register your notifier handler as well (or
> register it first, and then walk the list, which is pretty much what
> your patch does)?

Yes, and I originally did, but it looks to me like a useful common
pattern that is less error prone than open coding it.

g.

--=20
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.