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    SubjectRe: OOPS: 2.5.1-pre8 - cdrecord + ide_scsi

    Sorry Jens, you are mis-informed.
    SCSI is only the packbuilder, but it is excuted by the ATA PacketCommand.

    Regards,

    Andre Hedrick
    CEO/President, LAD Storage Consulting Group
    Linux ATA Development
    Linux Disk Certification Project

    On Sun, 9 Dec 2001, Jens Axboe wrote:

    > On Sun, Dec 09 2001, Carl Ritson wrote:
    > > On Sun, 9 Dec 2001, Jens Axboe wrote:
    > > > > > > Agrh, because of a bug in ide-scsi conversion this (other) bug went
    > > > > > > unnoticed for a while. Basically we cannot look up the request queue
    > > > > > > reliably from a request, since it may not have originated from the block
    > > > > > > layer. ide-scsi builds it's own, for example. For those, we don't want
    > > > > > > to trust the sg count either.
    > > > > > >
    > > > > > > Does attached patch work?
    > > > > >
    > > > > > Irk, there's a ide-scsi bug in there too. In
    > > > > > drivers/scsi/ide-scsi.c:idescsi_free_bio() change the kfree(bhp) to
    > > > > > bio_put(bhp)
    > > > > >
    > > > >
    > > > > With both these fixes applied cdrecord hangs for 30 seconds, then spits
    > > > > out "cdrecord: No such device or address. Cannot send SCSI cmd via ioctl",
    > > > > a couple of hundred times.
    > > > >
    > > > > In the from dmesg from the same time I get.
    > > > > ------
    > > > > hdc: timeout waiting for DMA
    > > > > ide_dmaproc: chipset supported ide_dma_timeout func only: 14
    > > > > hdc: status error: status=0x58 { DriveReady SeekComplete DataRequest }
    > > > > hdc: drive not ready for command
    > > > > scsi: device set offline - command error recover failed: host 0 channel 0
    > > > > id 0 lun 0
    > > > > ------
    > > >
    > > > Please try a run with DMA disabled.
    > > >
    > >
    > > Ok works with DMA off, so I expect that this new error is due to my resent
    > > memory upgrade (36 Hours ago) and the switch to using HIGHMEM(4GB)..
    > > So am I to believe that DMA is a problem with HIGHMEM(4GB) enabled ?
    >
    > No it's probably still an ide-scsi bug, I'm not suspecting your
    > hardware. The reason I ask is because until -pre8 (since bio merge in
    > -pre2), ide-scsi never used DMA even though it was set for the drive.
    >
    > --
    > Jens Axboe

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