linux-kernel - Re: hwrng on 82801EB/ER (ICH5/ICH5R) fails rngtest checks

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Date:	Thu, 27 Jul 2006 15:29:39 +0200
From:	Michael Buesch <mb@...sch.de>
To:	"gmu 2k6" <gmu2006@...il.com>
Cc:	"Jeff Garzik" <jgarzik@...ox.com>,
	"Philipp Rumpf" <prumpf@...drakesoft.com>,
	"Andrew Morton" <akpm@...l.org>, linux-kernel@...r.kernel.org
Subject: Re: hwrng on 82801EB/ER (ICH5/ICH5R) fails rngtest checks

On Wednesday 26 July 2006 21:44, gmu 2k6 wrote:
> > But could you try the following patch on top of latest git?
> > It's just a random test, but I think it's worth trying.
> > Let's see if it works around the issue.
> >
> > Index: linux-2.6/drivers/char/hw_random/intel-rng.c
> > ===================================================================
> > --- linux-2.6.orig/drivers/char/hw_random/intel-rng.c   2006-06-27 17:48:13.000000000 +0200
> > +++ linux-2.6/drivers/char/hw_random/intel-rng.c        2006-07-26 17:27:03.000000000 +0200
> > @@ -104,9 +104,14 @@
> >         int err = -EIO;
> >
> >         hw_status = hwstatus_get(mem);
> > +       hw_status = hwstatus_set(mem, hw_status & ~INTEL_RNG_ENABLED);
> > +       hw_status = hwstatus_set(mem, hw_status | INTEL_RNG_ENABLED);
> > +#if 0
> > +       hw_status = hwstatus_get(mem);
> >         /* turn RNG h/w on, if it's off */
> >         if ((hw_status & INTEL_RNG_ENABLED) == 0)
> >                 hw_status = hwstatus_set(mem, hw_status | INTEL_RNG_ENABLED);
> > +#endif
> >         if ((hw_status & INTEL_RNG_ENABLED) == 0) {
> >                 printk(KERN_ERR PFX "cannot enable RNG, aborting\n");
> >                 goto out;
> 
> well as it didn't work, are you sure it was not intended to be more like this:
> @@ -104,9 +104,14 @@
>        int err = -EIO;
> 
>        hw_status = hwstatus_get(mem);
> +       hw_status = hwstatus_set(mem, hw_status & ~INTEL_RNG_ENABLED);
> +       hw_status = hwstatus_set(mem, hw_status | INTEL_RNG_ENABLED);
> +#if 0
>        /* turn RNG h/w on, if it's off */
>        if ((hw_status & INTEL_RNG_ENABLED) == 0)
>                hw_status = hwstatus_set(mem, hw_status | INTEL_RNG_ENABLED);
> +#endif
>        if ((hw_status & INTEL_RNG_ENABLED) == 0) {
>                printk(KERN_ERR PFX "cannot enable RNG, aborting\n");
>                goto out;
> 
> ?

I don't think that makes a difference to the generated code, does it?

-- 
Greetings Michael.
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