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

From: Michael Buesch
Date: Thu Jul 27 2006 - 09:28:15 EST


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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