linux-kernel - Re: [PATCH] hwrng: Add TX4939 RNG driver

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Message-ID: <20090531013022.GA27930@gondor.apana.org.au>
Date:	Sun, 31 May 2009 11:30:22 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Atsushi Nemoto <anemo@....ocn.ne.jp>, linux-mips@...ux-mips.org,
	ralf@...ux-mips.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hwrng: Add TX4939 RNG driver

On Fri, May 29, 2009 at 04:29:07PM -0700, Andrew Morton wrote:
>
> > +static u64 read_rng(void __iomem *base, unsigned int offset)
> > +{
> > +	/* Caller must disable interrupts */
> > +	return ____raw_readq(base + offset);
> > +}
> 
> What is the reasoning behind the local_irq_disable() requirement?
> 
> Because I'm wondering whether this is safe on SMP?

Yes I'd like to see this fixed before adding this patch.

Thanks,
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