Re: 2.6.2-rc3-mm1

[Alistair John Strachan <s0348365 _at_ xxxxxxxxxxxx>]

On Wednesday 04 February 2004 00:00, Bartlomiej Zolnierkiewicz wrote:
[snip]
> > > > UDMA(133) /dev/ide/host0/bus0/target0/lun0: p1 p2 p3
> > > > hde: max request size: 128KiB
> > > >
> > > > 30 seconds later, I get something like:
> > > >
> > > > hde: lost interrupt
> > > > hde: lost interrupt
> > >
> > > It seems kernel hangs in ide-disk.c,
> > > idedisk_setup()->write_cache()->...
> > >
> > > > The kernel does not recover. Presumably it is a problem specific to
> > > > my PDC IDE controller.
> > >
> > > Do you run with Promise BIOS disabled?  If so please try booting kernel
> > > with "hde=autotune hdg=autotune" parameters.  If still no-go, try this
> > > patch:
> >
> > Neither suggestion changes the behaviour. I've got the BIOS enabled, but
> > in the past it's made no difference. I still see lost interrupts.
>
> Please try this debugging patch to see it hangs on
> idedisk_setup()->write_cache().
>
> --- linux/drivers/ide/ide-disk.c	2004-02-04 00:57:49.000000000 +0100
> +++ linux-2.6.2-rc3-bk3/drivers/ide/ide-disk.c	2004-02-04
> 00:58:58.571025744 +0100 @@ -1668,8 +1668,10 @@
>  #endif	/* CONFIG_IDEDISK_MULTI_MODE */
>  	}
>  	drive->no_io_32bit = id->dword_io ? 1 : 0;
> +	printk(KERN_INFO "%s: before write_cache()\n", drive->name);
>  	if (drive->id->cfs_enable_2 & 0x3000)
>  		write_cache(drive, (id->cfs_enable_2 & 0x3000));
> +	printk(KERN_INFO "%s: after write_cache()\n", drive->name);
>
>  #ifdef CONFIG_BLK_DEV_IDE_TCQ_DEFAULT
>  	if (drive->using_dma)

Tried the patch. I see both before and after messages for hda, but when hde is 
probed I see neither. Briefly looking at the IDE code, I see the max request 
size: printk comes before either of those lines, as as nothing else is 
printed after that line (see original bug report), I can only assume the 
problem is somewhere before the write_cache().

I applied the patch on top of your previous changes, as they seemed innocuous 
enough.

-- 
Cheers,
Alistair.

personal:   alistair()devzero!co!uk
university: s0348365()sms!ed!ac!uk
student:    CS/AI Undergraduate
contact:    7/10 Darroch Court,
            University of Edinburgh.
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