linux-kernel - Re: Disk spindown on rmmod sd

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Date:	Fri, 26 Oct 2007 19:25:42 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
CC:	James.Bottomley@...eleye.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-scsi@...r.kernel.org
Subject: Re: Disk spindown on rmmod sd_mod

Jan Engelhardt wrote:
> I am using 2.6.23-rc9 with pata_sis. `modprobe -r sd_mod`, which I ran 
> from initramfs, caused all my disks to spindown - sd even told me so.
> 
> I recall there has been talk a while back about whether to spin down 
> disks on shutdown or not, but I do not think it touched the removal of 
> sd_mod, did it? So either way, can someone fill me in why the spindown 
> is done?

The problem is that it's difficult to tell why a disk is going down from
sd_shutdown(), so it issues STOP unless system state is SYSTEM_RESTART.
 Maybe we need to issue STOP only for SYSTEM_HALT, SYSTEM_POWER_OFF and
SYSTEM_SUSPEND_DISK.

Thanks.

-- 
tejun
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