linux-kernel - Re: Loud "pop" coming from hard drive on reboot

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Date:	Thu, 19 Apr 2007 00:25:13 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Mark Lord <lkml@....ca>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>, 7eggert@....de,
	Chuck Ebbert <cebbert@...hat.com>,
	emisca <emisca.ml@...il.com>,
	Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org, Adrian Bunk <bunk@...sta.de>,
	Andrew Morton <akpm@...l.org>
Subject: Re: Loud "pop" coming from hard drive on reboot

Mark Lord wrote:
> Alan Cox wrote:
>>> +        if (dev->needs_flush && ata_try_flush_cache(dev)) {
>>>              return ata_scsi_flush_xlat;
>>> +            dev->needs_flush = 0;
>>
>> Works better if you swap the dev-> and return lines
> 
> Heh, yeah, I noticed that!
> 
> Here it is, *tested* now, with another fix.
> 
> It would be nice if somebody who can hear the "pop" would also test this,
> as it will confirm that this is a complete fix for the problem.

You'll probably be able to here the "pop" on sleep-to-disk.

> My "pop" drives are busy elsewhere right now.
> 
> Tejun might use something like this, or do something better in libata-core,
> but it's still helpful to have confirmation that we're on the right track.

Yeap, I was thinking about more conservative check but this looks simple
and sweet.  :-)

-- 
tejun
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