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From: Michael Ellerman <mpe@ellerman.id.au>
To: Lars-Peter Clausen <lars@metafoo.de>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>
Cc: linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH] ibmebus: Remove legacy suspend/resume support
Date: Mon, 21 Nov 2016 21:16:46 +1100	[thread overview]
Message-ID: <87k2bxw31t.fsf@concordia.ellerman.id.au> (raw)
In-Reply-To: <57d7b8c5-1deb-937c-5ad9-23912b38bd60@metafoo.de>

Lars-Peter Clausen <lars@metafoo.de> writes:

> On 11/21/2016 10:52 AM, Michael Ellerman wrote:
>> Lars-Peter Clausen <lars@metafoo.de> writes:
>> 
>>> There are no ibmebus driver that make use of legacy suspend/resume. This
>>> patch removes the support for it from ibmebus framework, new ibmebus driver
>>> (as unlikely as they are) wanting to use suspend/resume should use
>>> dev_pm_ops.
>>>
>>> Since there aren't any special bus specific things to do during
>>> suspend/resume and since the PM core will automatically fallback directly
>>> to using the device's PM ops if no bus PM ops are specified there is no
>>> need to have any special ibmebus PM ops at all.
>> 
>> Thanks, this looks like a really nice cleanup.
>> 
>> I don't know the PM code at all, is there any down side to removing all
>> of this?
>
> No, dev_pm_op is a full replacement for the legacy suspend/resume callbacks
> and dev_pm_ops are supported by the power management core out of the box
> without having to have any bus specific code. Which is why we want to get
> rid of legacy PM callbacks in general and this is one of the last few buses
> that still implements it. But since there are no drivers that use it
> removing it is straight forward in this case, for others it takes a bit more
> work.

Great, thanks. I'll merge this via the powerpc tree for 4.10.

cheers

  reply	other threads:[~2016-11-21 10:16 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-11-19 13:42 [PATCH] ibmebus: Remove legacy suspend/resume support Lars-Peter Clausen
2016-11-21  9:52 ` Michael Ellerman
2016-11-21 10:09   ` Lars-Peter Clausen
2016-11-21 10:16     ` Michael Ellerman [this message]
2016-11-25  0:04 ` Michael Ellerman

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