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Date: Thu, 29 Nov 2007 23:02:04 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Kyle McMartin <kyle@mcmartin.ca>,
       Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>,
       LKML <linux-kernel@vger.kernel.org>, linuxppc-dev@ozlabs.org,
       Andy Whitcroft <apw@shadowen.org>,
       Balbir Singh <balbir@linux.vnet.ibm.com>, linux-scsi@vger.kernel.org,
       "Rafael J. Wysocki" <rjw@sisk.pl>, Matthew Wilcox <willy@debian.org>
Subject: Re: [BUG] 2.6.24-rc3-git2 softlockup detected
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On Thu, 29 Nov 2007 23:00:47 -0800 Andrew Morton <akpm@linux-foundation.org> wrote:

> On Fri, 30 Nov 2007 01:39:29 -0500 Kyle McMartin <kyle@mcmartin.ca> wrote:
> 
> > On Thu, Nov 29, 2007 at 12:35:33AM -0800, Andrew Morton wrote:
> > > ten million is close enough to infinity for me to assume that we broke the
> > > driver and that's never going to terminate.
> > > 
> > 
> > how about this? doesn't break things on my pa8800:
> > 
> > diff --git a/drivers/scsi/sym53c8xx_2/sym_hipd.c b/drivers/scsi/sym53c8xx_2/sym_hipd.c
> > index 463f119..ef01cb1 100644
> > --- a/drivers/scsi/sym53c8xx_2/sym_hipd.c
> > +++ b/drivers/scsi/sym53c8xx_2/sym_hipd.c
> > @@ -1037,10 +1037,13 @@ restart_test:
> >  	/*
> >  	 *  Wait 'til done (with timeout)
> >  	 */
> > -	for (i=0; i<SYM_SNOOP_TIMEOUT; i++)
> > +	do {	
> >  		if (INB(np, nc_istat) & (INTF|SIP|DIP))
> >  			break;
> > -	if (i>=SYM_SNOOP_TIMEOUT) {
> > +		msleep(10);
> > +	} while (i++ < SYM_SNOOP_TIMEOUT);
> > +
> > +	if (i >= SYM_SNOOP_TIMEOUT) {
> >  		printf ("CACHE TEST FAILED: timeout.\n");
> >  		return (0x20);
> >  	}
> > diff --git a/drivers/scsi/sym53c8xx_2/sym_hipd.h b/drivers/scsi/sym53c8xx_2/sym_hipd.h
> > index ad07880..85c483b 100644
> > --- a/drivers/scsi/sym53c8xx_2/sym_hipd.h
> > +++ b/drivers/scsi/sym53c8xx_2/sym_hipd.h
> > @@ -339,7 +339,7 @@
> >  /*
> >   *  Misc.
> >   */
> > -#define SYM_SNOOP_TIMEOUT (10000000)
> > +#define SYM_SNOOP_TIMEOUT (1000)
> >  #define BUS_8_BIT	0
> >  #define BUS_16_BIT	1
> >  
> 
> That might be the fix, but do we know what we're actually fixing?  afaik
> 2.6.24-rc3 doesn't get this timeout, 2.6.24-rc3-mm2 does get it and we
> don't know why?
> 

<looks at Subject:>

<Checks that Rafael was cc'ed>

So 2.6.24-rc3 was OK and 2.6.24-rc3-git2 is not?