linux-kernel - Re: Off-by-one in both LIBATA and IDE drivers

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Date:	Wed, 11 Mar 2009 17:38:46 +0900 (JST)
From:	Norman Diamond <n0diamond@...oo.co.jp>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	n0diamond@...oo.co.jp
Subject: Re: Off-by-one in both LIBATA and IDE drivers

Alan Cox wrote:
> Norman Diamond <n0diamond@...oo.co.jp> wrote:
> 
>> It looks like both LIBATA and the old IDE drivers
>> have an off-by-one error in deciding whether to use
>> READ SECTOR(S) instead of READ SECTOR(S) EXT.
> 
> This was fixed some time ago, you need a newer
> kernel.

Well, either that or I need an older kernel.  It was also
fixed in 2.6.20, for which I think there was a ready-made
Slax distribution.

On another topic, trying 2.6.20 in whatever Slax
distribution it was, an Intel ICH7M had DMA enabled on
both /dev/hda and /dev/hdc.  I understand that the change
which was made shortly after that is considered to be by
design not a bug.  In 2.6.20 I didn't even have to type a
"combined_mode" parameter, it just worked.  I understand
that the addition and subsequent deletion of the
"combined_mode" parameter are considered to be by design
not bugs.  But it is not at all pleasant that my /dev/hda
runs at 1.3 megabytes per second in 2.6.24.3 and later,
when it used to run at 45 megabytes per second in 2.6.20. 
Yeah I know libata is supposed to solve all this stuff. 
Removed some bugs and added others.

I can't go newer than 2.6.24.3 until I find a version
where TASKFILEs start working again.  There might not be
one.  Yeah I know libata is supposed to solve all this
stuff.  I wonder how much time I'll need and how many
varieties of hardware I'll have to buy to see if it's
really fixed.

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