linux-kernel - Re: ata

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Message-ID: <47D08892.3080209@gmail.com>
Date:	Fri, 07 Mar 2008 09:13:06 +0900
From:	Tejun Heo <htejun@...il.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
CC:	Mark Lord <liml@....ca>, Matthew Wilcox <matthew@....cx>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jeff Garzik <jeff@...zik.org>
Subject: Re: ata_ram driver

James Bottomley wrote:
>> * Driver unload: Dealt the same way as hot unplugging.
> 
> This is the problem case: driver unloading should have a
> scsi_remove_host() in its path.  This is the trigger that sends out the
> flushes/stops and calls slave_destroy.  scsi_remove_host() doesn't
> actually return until all the destroys are completed, so it makes module
> unloading wait until everything is properly shut down.
> 
>> Making driver unload like explicit unplug request is possible but it
>> will mean that drives will be spun down on driver unload, which can be
>> annoying to developers. 
> 
> You have a sysfs flag to prevent that, don't you?

Yeap, sure.  It's the combination of things that always made me put this
off.  Is there a function I can call to just shutdown the host instead
of destroying it?

Thanks.

-- 
tejun
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