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    SubjectRe: 2.2.14 ATAPI CDROM crash on mount
    In <> Joachim Weller ( wrote:
    > Hi,

    > I upgraded from 2.2.10 to 2.2.14 (2x686 SMP) and encountered a
    > tremendous ISDN performance increase ! Congratulations !
    > But, when mounting an ATAPI cdrom, the system crashes instantly without
    > leaving
    > any messages (/var/log/messages) or any error msg. on screen
    > (even when mounting manually with -v).
    > The first kernel I built, had ATAPI cdrom support compiled in,
    > but stopped booting after:
    > ----------------------------------
    > hdc: HITACHI CDR-8130, ATAPI CDROM drive
    > ide1 at 0x170-0x177,0x376 on irq 15
    > ----------------------------------

    > Normally (kernel 2.2.10) continues with the lines:
    > ---------------------------------
    > hdc: ATAPI 16X CD-ROM drive, 128kB Cache
    > Uniform CDROM driver Revision 2.55
    > ---------------------------------

    > I tried compiling ATAPI cdrom as moule and the kernel boots and runs
    > stable,
    > as long as I do not attempt to mount the cdrom.
    > I even could just modprobe the cdrom.o module and load it flawlessly.
    > But when issuing a mount of the cdrom, the system instantly freezes.
    > The doc of 2.2.14 and a comparision of cdrom.c (2.55) of kernel 2.2.10
    > with
    > cdrom (2.56) of 2.2.14 did not reveal any indication of changes with
    > potential risks,
    > and compiling the 2.2.10 version - as expected - did not cure the
    > problem.
    > Now I have no glue how to trace the problem further down, but I would
    > love to keep
    > the outstanding ISDN performance of 2.2.14.

    Try to do 'hdparm -d 0 /dev/hdc' before mount attempt. Some CD-ROM's do work
    work 100% correctly with DMA. Though here (where I have such problem) it'll
    lock 2.2.10 as well.

    > Help very much appreciated,

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