linux-kernel - Re: [PATCH] block: fix residual byte count handling

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Date:	Wed, 05 Mar 2008 01:17:21 +0900
From:	Tejun Heo <htejun@...il.com>
To:	FUJITA Tomonori <tomof@....org>
CC:	efault@....de, jens.axboe@...cle.com,
	fujita.tomonori@....ntt.co.jp,
	James.Bottomley@...senPartnership.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	linux-scsi@...r.kernel.org, jgarzik@...ox.com, bzolnier@...il.com
Subject: Re: [PATCH] block: fix residual byte count handling

Tejun Heo wrote:
> FUJITA Tomonori wrote:
>>> Aiee... device going down after timing out on READ_DISC_INFO.  That's
>>> gruesome.  Can you please try the other patches?
>> Tejun, I thought that libata needs a fix for sum(sg) != rq->data_len. No?
> 
> The extra_len you added to qc->nbytes should be it.  The only other
> place to pay attention is the ATAPI transfer chunk size and your patch
> seems to get it right.
> 
>> Now Jens' git tree should work with all the non libata stuff, ide,
>> firewire, bsg, etc. But I'm not sure about libata.
> 
> With the second patch, all others should be fine no matter what.  I'll
> go check libata part again.

I can reproduce the problem here and it's very weird.  I'll report back
when I know more.

-- 
tejun
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