Date: Thu, 21 Oct 2004 18:22:44 +0200
From: Jens Axboe <axboe@suse.de>
To: Meelis Roos <mroos@linux.ee>
Cc: Linux Kernel list <linux-kernel@vger.kernel.org>
Subject: Re: readcd hangs in blk_execute_rq
Message-ID: <20041021162244.GB14154@suse.de>
References: <20041021161100.GA14154@suse.de> <Pine.GSO.4.44.0410211915460.12730-100000@math.ut.ee>
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On Thu, Oct 21 2004, Meelis Roos wrote:
> > > > > ide-cd: cmd 0x28 timed out
> > > > > hdc: DMA interrupt recovery
> > > > > hdc: lost interrupt
> > > > > hdc: status timeout: status=0xd0 { Busy }
> > > > > hdc: status timeout: error=0x00
> > > > > hdc: DMA disabled
> > > > > hdc: drive not ready for command
> > > > > hdc: ATAPI reset complete
> 
> > > It worked in earlier 2.4 kernels (2.4.18?) with DMA - I don't remember
> > > if it had some reliability problems. Since then, it's no dma. We have 3
> > > such computers here (Intel D816EEA2 mainboard, this specific Sony CDrom)
> > > and they all behave the same.
> >
> > 2.4.x never used dma for this operation. Does 2.6.9 work if you turn off
> > dma first?
> 
> I have not tried this operation before. Reading data disks with DMA
> worked and that's what I have used. I did read the same disk with
> readdisk subcommand on readcd currently, it was successful until the end
> of disk (6xx MB - maybe the end of the disk).

Yes you are right, readcd should use dma.

> Will try it with turning DMA off first.

Ok

-- 
Jens Axboe

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