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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <48443C3C.3010401@redhat.com>
Date:	Mon, 02 Jun 2008 14:30:20 -0400
From:	Ric Wheeler <rwheeler@...hat.com>
To:	kristen.c.accardi@...el.com
CC:	Jeff Garzik <jeff@...zik.org>, Mark Lord <liml@....ca>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Pavel Machek <pavel@....cz>, Theodore Tso <tytso@....edu>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ata: ahci: power off unused ports

Kristen Carlson Accardi wrote:
> On Mon, 02 Jun 2008 14:15:27 -0400
> Jeff Garzik <jeff@...zik.org> wrote:
>
>   
>> Kristen Carlson Accardi wrote:
>>     
>>> Here you can see that it would be very easy for another driver
>>> to just add code to set the NO_HOTPLUG flag and then this code
>>> will work for them as well, since we power off the phy using
>>> DET which is specified by SATA.
>>>       
>>> here's that code:
>>>       
>> Agreed.  The main discussion in this sub-thread is more about user 
>> interface.  The user interface in this case, a module option, is 
>> specific to AHCI.
>>
>> Surely you can see how it is a bit silly to force each driver writer to 
>> create the same user interface in each driver, to support a generic concept.
>>
>> 	Jeff
>>
>>
>>     
> Not all drivers will need a user interface to turn off hotplug
> I would think.  At any rate - I would think it'd be better to let
> driver writers decide how they want their drivers to behave wrt
> hotplug and power instead of forcing a generic policy on everyone.
>
> This patch would provide users of AHCI controllers a way to save
> power now, while you work on the grand scheme for polling/turning on off
> hotplug via sysfs.  It's an interim solution that impacts nobody but
> ahci users and is can be easily integrated into whatever solution you
> eventually work out.
>   
I like the patch -  it seems that it will help a lot of users out near 
term in a very positive way while we iterate on the broader solution,

ric




--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/