linux-kernel - Re: [PATCH] isa: Change driver to use dev_pm

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Message-id: <B8EFE96D1287C24090BAD9D858E15E617633C7@sisaex02sj>
Date:	Mon, 12 Aug 2013 17:02:11 +0000
From:	Shuah Khan <shuah.kh@...sung.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"shuahkhan@...il.com" <shuahkhan@...il.com>,
	Shuah Khan <shuah.kh@...sung.com>
Subject: Re: [PATCH] isa: Change driver to use dev_pm_ops infrastructure

On 08/10/2013 12:51 PM, Greg KH wrote:
> On Sat, Aug 10, 2013 at 09:20:46AM -0600, Shuah Khan wrote:
>> Change isa bus to register dev_pm_ops via bus_type.pm. Add freeze ops for
>> PM_EVENT_FREEZE handling.
>
> why?
>

I see that my changelog is very cryptic. Sorry about that.

I have been converting drivers from using legacy pm_ops to dev_pm_ops 
which will allow all drivers to use the same infrastructure and overtime 
obsolete the legacy usage. With this change I made, __device_suspend() 
will find  dev->bus->pm->suspend instead of dev->bus->suspend.

isa bus and isa drivers probably will never take advantage of the pm 
capabilities dev_pm_ops allow for, the reason to update the isa bus to 
use dev_pm_ops is to allow for obsoleting legacy pm_ops handling in pm.

-- Shuah

Shuah Khan, Linux Kernel Developer - Open Source Group Samsung Research 
America (Silicon Valley) shuah.kh@...sung.com | (970) 672-0658
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