Date: Thu, 26 May 2005 19:14:26 +0200
From: Jens Axboe <axboe@suse.de>
To: Meelis Roos <mroos@linux.ee>
Cc: Linux Kernel list <linux-kernel@vger.kernel.org>,
       Linus Torvalds <torvalds@osdl.org>
Subject: Re: ide-cd problem in 2.6.12-rc5 + todays snapshot
Message-ID: <20050526171425.GX1419@suse.de>
References: <Pine.SOC.4.61.0505261816190.28439@math.ut.ee>
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On Thu, May 26 2005, Meelis Roos wrote:
> Background: I have a Sony CDU5211 CD drive with Intel D815EEA2 mainboard 
> (ICH2 IDE in 815 chipset). Since 2.4.21 timeframe IDE DMA for this CD 
> drive is broken (see my post 
> http://www.ussg.iu.edu/hypermail/linux/kernel/0410.3/0480.html). This 
> happens on at least 2 identical machines. This is the first problem 
> (that I have learned to live with).
> 
> Now, since ide-cd dma is broken, the first access to cd always gets DMA 
> timeout and turns off DMA, then it works. I have hddtemp installed and 
> it probes for drives on boot. In 2.6.12 (and I think I tested pristine 
> 2.6.12-rc5 too) the cd works as before - dma timeout+disable on first 
> access (by hddtemp).
> 
> Now, in 2.6.12-rc5 + todays git snapshot, it does not work any more. I 
> suspect the DMA alignment change.

It must be, thanks for reporting this so quickly. Linus, can you exclude
that patch again? Rather miserably slow burning for some, than broken
hardware for others.

Seems we do need finer granularity setting of alignment/length
restrictions.

-- 
Jens Axboe

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