linux-kernel - Re: [PATCH #upstream-fixes] libata: fix hotplug for drivers which don't implement LPM

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Date:	Wed, 02 Mar 2011 02:45:17 -0500
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Tejun Heo <tj@...nel.org>
CC:	linux-ide@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	stable <stable@...nel.org>
Subject: Re: [PATCH #upstream-fixes] libata: fix hotplug for drivers which
 don't implement LPM

On 02/24/2011 01:30 PM, Tejun Heo wrote:
> ata_eh_analyze_serror() suppresses hotplug notifications if LPM is
> being used because LPM generates spurious hotplug events.  It compared
> whether link->lpm_policy was different from ATA_LPM_MAX_POWER to
> determine whether LPM is enabled; however, this is incorrect as for
> drivers which don't implement LPM, lpm_policy is always
> ATA_LPM_UNKNOWN.  This disabled hotplug detection for all drivers
> which don't implement LPM.
>
> Fix it by comparing whether lpm_policy is greater than
> ATA_LPM_MAX_POWER.
>
> Signed-off-by: Tejun Heo<tj@...nel.org>
> Cc: stable@...nel.org

applied, though putting this into 2.6.38.1 is preferred to changing this 
at -rc7...  stable@ cc'd.

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