From: Nigel Cunningham <ncunningham@cyclades.com>
Organization: Cyclades Corporation
To: Andrew Morton <akpm@osdl.org>
Subject: Re: [PATCH] Make libata not powerdown drivers on PM_EVENT_FREEZE.
Date: Thu, 23 Mar 2006 22:16:03 +1000
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Cc: linux-kernel@vger.kernel.org, Jeff Garzik <jeff@garzik.org>
References: <200603232151.47346.ncunningham@cyclades.com> <20060323040649.3a6c96f1.akpm@osdl.org>
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Hi.

On Thursday 23 March 2006 22:06, Andrew Morton wrote:
> Nigel Cunningham <ncunningham@cyclades.com> wrote:
> > At the moment libata doesn't pass pm_message_t down ata_device_suspend.
> >  This causes drives to be powered down when we just want a freeze,
> >  causing unnecessary wear and tear. This patch gets pm_message_t passed
> >  down so that it can be used to determine whether to power down the
> >  drive.
>
> Does this explain http://bugzilla.kernel.org/show_bug.cgi?id=3D6264 ?

Yes, it does.

> This might be 2.6.16.1 material - how irritating is it?

Very. It extends the time to write the image, but as mentioned above, I'm m=
ore=20
concerned by the fact that (assuming I understand correctly), it's using up=
=20
the limited number of power cycles a drive can handle.

Regards,

Nigel

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