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

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From: Francois Romieu <romieu@xxxxxxxxxxxxx>
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@xxxxxxxxxxxx>
> Signed-off-by: Francois Romieu <romieu@xxxxxxxxxxxxx>
> Cc: Rafael J. Wysocki <rjw@xxxxxxx>
> Cc: Hayes Wang <hayeswang@xxxxxxxxxxx>
> Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
> ---
>  This sucker turned my silent wake-on-alarm workstation into an early
>  sunday morning testbed takeoff. Please consider before 3.3 goes out.

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