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]

Date:	Mon, 02 Jun 2008 03:43:35 -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:
>> If you are talking about SATA -- incorrect.
>>
>> The patch deals with policy, and the user MUST have the ability to 
>> control this stuff.  Otherwise you create a situation where the user 
>> might be denied hotplug use in valid cases, or similar negative situations.
> 
> The policy isn't however complicated. Tejun added the stuff for forcing
> cable type and mode on setup and has therefore written all the per device
> setup code we might need. Alternatively a single
> 
> 	foo=1/0
> 
> option has been fine for acpi and will do fine for this. Total additional
> cost - 1 line.

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.

	Jeff



--
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/