linux-kernel - Re: [PATCH] ata: ahci: power off unused ports

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Date:	Mon, 02 Jun 2008 05:48:16 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Pavel Machek <pavel@....cz>,
	Kristen Carlson Accardi <kristen.c.accardi@...el.com>,
	Theodore Tso <tytso@....edu>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ata: ahci: power off unused ports

Alan Cox wrote:
>> The key requirement is per-port control.  Ideally via hdparm or another 
>> userspace tool, but kernel command line (module options) or sysfs would 
>> be just fine too.  And agreed, the minimal you need is simply 1/0 for 
>> the port's policy.
> 
> We don't need it per port Jeff, you are being quite silly here. Right now
> its permanently foo=0 for all ports and nobody has suffered anything too
> horrible so being able to turn it off for all ports is clearly quite
> sufficient for the neat future.

Er, huh?  foo=0 means hotplug continues to work on the unused ports. 
Nobody has suffered because we default to enabling all the goodies.

	Jeff


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