Date: Thu, 21 Oct 2004 18:11:01 +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: <20041021161100.GA14154@suse.de>
References: <20041021154122.GC32465@suse.de> <Pine.GSO.4.44.0410211844540.29471-100000@math.ut.ee>
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On Thu, Oct 21 2004, Meelis Roos wrote:
> > > And here it hangs. ps shows readcd is in D state, in blk_execute_rq.
> > > dmesg shows lines of
> > >
> > > hdc: lost interrupt
> 
> Meanwhile I found out that if I eject the CD by pressing button, it
> resumes its work and reports error to the user process.
> 
> > > 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
> >
> > Did it previously work reliably with dma (which kernel)? Does it now
> > work reliably without dma now? Do send your entire dmesg after a boot
> > too, btw.
> 
> 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?

-- 
Jens Axboe

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