Re: IDE problem source ?

[Geert U. <ge...@li...>]

On Tue, 24 Sep 2002, [iso-8859-2] Krystian Bac=B3awski wrote:
> I think I found place where kernel hungs up when it tries to probe IDE
> hardware. I played a bit with ide-probe.c and found out that kernel hun=
gs
> up on enable_irq. I've added two lines with printk. First is reached,
> second not. Code below was cut out from ide-probe.c file,
> probe_hwif:554-566.
>=20
>         __restore_flags(flags); /* local CPU only */
>         printk("probe_hwif: enabling irq\n"); /* debug */
>         if (hwif->hw.ack_intr && hwif->irq)
>                 enable_irq(hwif->irq);
>         printk("probe_hwif: irq enabled\n"); /* debug */
>         for (unit =3D 0; unit < MAX_DRIVES; ++unit) {
>                 ide_drive_t *drive =3D &hwif->drives[unit];
>                 if (drive->present) {
>                         ide_tuneproc_t *tuneproc =3D HWIF(drive)->tunep=
roc;
>                         if (tuneproc !=3D NULL && drive->autotune =3D=3D=
 1)
>                                 tuneproc(drive, 255);
>                 }
>         }
>=20
> I hope that information would help a bit in tracing a bug.

What's the manufacturer and model of your disk?

I remember fixing an issue with some WD disks many years ago, where the d=
isk
didn't honor the `disable interrupt' IDE command, causing a lock up on A4=
000
when interrupts were enabled.  It didn't show up on PC because on PC the =
IDE
interrupt wasn't shared.

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m6=
8k.org

In personal conversations with technical people, I call myself a hacker. =
But
when I'm talking to journalists I just say "programmer" or something like=
 that.
							    -- Linus Torvalds