Messages in this thread | | | Date | Tue, 10 Sep 2002 21:09:06 +0200 | From | Jens Axboe <> | Subject | Re: Oops + Aiee when mounting CDROM via ide-scsi under 2.4.20-pre5-ac4 |
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On Tue, Sep 10 2002, Martin Knoblauch wrote: > Hi, > > I am getting a reproducable Oops+Aiee when trying to mount a ATAPI > CDROM via the ide-scsi interface under 2.4.20-pre5-ac4. Works OK > without ide-scsi.
Ok, the problem is that ide-scsi builds a request which eventually ends up going through the ide code dma mapping. ide_build_sglist() does a rq_data_dir() on the request, which BUG()'s if the command isn't an fs read or write. This actually went undetected before, because the ide code did:
if (rq->cmd == READ) direction is dma from device else direction is to device
and rq->cmd is IDESCSI_PC_RQ in this case. So we always mapped for dma to the device, even if that wasn't the case.
Hmm, maybe just adding a single direction bit to struct request is the easy way out for 2.4. Or... I'll cook something up.
-- Jens Axboe
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