Messages in this thread | | | Date | Mon, 25 Oct 2004 18:58:01 +0200 | From | Jens Axboe <> | Subject | Re: readcd hangs in blk_execute_rq |
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On Mon, Oct 25 2004, Meelis Roos wrote: > > > Turned DMA off with hdparm -d 0 /dev/hdc, still the same. > > > Turned ATAPI DMA support off completely (activated "Use DMA only for > > > disks" compile option), still the same half-hang. > > > > Can I talk you into trying to find out when this broke? You mention > > 2.4.18 as working, did 2.4.19 break? Narrowing this down as much as > > possible would be very helpful. > > OK, did some testing. > > 2.4.18, 2.4.19 and 2.4.20 are the same - mostly working. This means that > it reads non-broken data CD-s with DMA with no problems, but it loses an > interrupt and disables DMA with a faulty data CD (dmesg below). > > The IDE changes in 2.4.21-pre1 cause DMA to fail at first read attempt > and all later kernels behave the same. > > The dmesg from 2.4.18 in case of CD read error (with a known faulty cd): > > hdc: command error: status=0x51 { DriveReady SeekComplete Error } > hdc: command error: error=0x54 > end_request: I/O error, dev 16:00 (hdc), sector 1274020 > ide_dmaproc: chipset supported ide_dma_lostirq func only: 13 > hdc: lost interrupt > hdc: status timeout: status=0xd0 { Busy } > hdc: DMA disabled > hdc: drive not ready for command > hdc: ATAPI reset complete
Alan, any ideas? IIRC, the 2.4.21-pre1 huge ide update is all your doing.
-- Jens Axboe
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