linux-kernel - Re: [PATCH 2/2 v5] libata: Implement disk shock protection support

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Date:	Sun, 21 Sep 2008 05:58:14 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Elias Oltmanns <eo@...ensachen.de>
CC:	Jeff Garzik <jeff@...zik.org>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2 v5] libata: Implement disk shock protection support

Elias Oltmanns wrote:
> On user request (through sysfs), the IDLE IMMEDIATE command with UNLOAD
> FEATURE as specified in ATA-7 is issued to the device and processing of
> the request queue is stopped thereafter until the specified timeout
> expires or user space asks to resume normal operation. This is supposed
> to prevent the heads of a hard drive from accidentally crashing onto the
> platter when a heavy shock is anticipated (like a falling laptop
> expected to hit the floor). In fact, the whole port stops processing
> commands until the timeout has expired in order to avoid any resets due
> to failed commands on another device.
> 
> Signed-off-by: Elias Oltmanns <eo@...ensachen.de>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun
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