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    SubjectRe: 2.4.21-rc: lost interrupt wgen usinf atapi cdrom-drive
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    On Tue, 2003-05-13 at 09:37, Michael Reincke wrote:
    > On Tue, 2003-05-13 at 09:29, Michael Reincke wrote:
    > > On Tue, 2003-05-13 at 08:21, Andrey Borzenkov wrote:
    > > > > i upgraded the linux kernel of my computer from 2.4.21-pre4 to
    > > > > 2.4.21-rc2 and got the following messages in syslog when using my
    > > > > atapi-cdrom drive:
    > > > > May 12 09:42:52 pcew80 kernel: hdc: DMA interrupt recovery
    > > > > May 12 09:42:52 pcew80 kernel: hdc: lost interrupt
    > > > > May 12 09:42:52 pcew80 kernel: hdc: status timeout: status=0xd0 { Busy }
    > > > > May 12 09:42:52 pcew80 kernel: hdc: status timeout: error=0x00
    > > > > May 12 09:42:52 pcew80 kernel: hdc: DMA disabled
    > > > > May 12 09:42:52 pcew80 kernel: hdc: drive not ready for command
    > > > > May 12 09:42:52 pcew80 kernel: hdc: ATAPI reset complete
    > > >
    > > >
    > > > It smells like ide_do_request forgets to enable interrupts when
    > > > request queue is empty.
    > > >
    > > > drivers/ide/ide-io.c:
    > > >
    > > > void ide_do_request (ide_hwgroup_t *hwgroup, int masked_irq)
    > > > hwgroup->busy = 0;
    > > >
    > > > Ironically it does not release ide_intr_lock in this case but we
    > > > are not on m68k so we do not care :)
    > > >
    > > > Could you please try to add local_irq_enable() before ide_release_lock() above and see if it helps?
    > > > It has been reported to have fixed fix problems for other people. OTOH
    > > > I did have sevral hard lockups with this so there may be more subtle
    > > > problems issues.
    > > The hangs and timeouts and total blocking of the cdrom drive seems to be
    > > away, but the lost interrupt messages are still there.
    > > But have in mind I've only a quick test so far.
    >
    > Bad news the hangs and timeout are still there!

    The problem is vanishing when disabling
    IO-APIC support on uniprocessors
    --
    Michael Reincke, NUT Team 2 (Software Build Management)

    STN ATLAS Elektronik GmbH, Bremen (Germany)
    E-mail : reincke.m@stn-atlas.de | mail: Sebaldsbrücker Heerstr 235
    phone : +49-421-457-2302 | 28305 Bremen
    fax : +49-421-457-3913 |




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