netdev - Re: [PATCH] r8169: runtime resume before shutdown.

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Message-Id: <20120306.151503.848145173320023273.davem@davemloft.net>
Date:	Tue, 06 Mar 2012 15:15:03 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	romieu@...zoreil.com
Cc:	netdev@...r.kernel.org, hayeswang@...ltek.com, snanda@...omium.org,
	rjw@...k.pl, stern@...land.harvard.edu
Subject: Re: [PATCH] r8169: runtime resume before shutdown.

From: Francois Romieu <romieu@...zoreil.com>
Date: Tue, 6 Mar 2012 12:14:12 +0100

> With runtime PM, if the ethernet cable is disconnected, the device is
> transitioned to D3 state to conserve energy. If the system is shutdown
> in this state, any register accesses in rtl_shutdown are dropped on
> the floor. As the device was programmed by .runtime_suspend() to wake
> on link changes, it is thus brought back up as soon as the link recovers.
> 
> Resuming every suspended device through the driver core would slow things
> down and it is not clear how many devices really need it now.
> 
> Original report and D0 transition patch by Sameer Nanda. Patch has been
> changed to comply with advices by Rafael J. Wysocki and the PM folks.
> 
> Reported-by: Sameer Nanda <snanda@...omium.org>
> Signed-off-by: Francois Romieu <romieu@...zoreil.com>
> Cc: Rafael J. Wysocki <rjw@...k.pl>
> Cc: Hayes Wang <hayeswang@...ltek.com>
> Cc: Alan Stern <stern@...land.harvard.edu>
> ---
> 
>  This sucker turned my silent wake-on-alarm workstation into an early
>  sunday morning testbed takeoff. Please consider before 3.3 goes out.

Applied.
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