Re: readcd hangs in blk_execute_rq

[Jens Axboe]

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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