linux-kernel - Re: [PATCH 05/11] irqchip: bcm7120-l2: Make sure all register accesses use base+offset

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Date:	Wed, 29 Oct 2014 08:56:53 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Kevin Cernekee <cernekee@...il.com>
Cc:	f.fainelli@...il.com, tglx@...utronix.de, jason@...edaemon.net,
	ralf@...ux-mips.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, mbizon@...ebox.fr, jogo@...nwrt.org,
	linux-mips@...ux-mips.org
Subject: Re: [PATCH 05/11] irqchip: bcm7120-l2: Make sure all register accesses use base+offset

On Wednesday 29 October 2014 08:46:00 Arnd Bergmann wrote:
> On Tuesday 28 October 2014 20:58:52 Kevin Cernekee wrote:
> > 
> >         irq_gc_lock(gc);
> >         /* Save the current mask and the interrupt forward mask */
> > -       b->saved_mask = __raw_readl(b->base) | b->irq_fwd_mask;
> > +       b->saved_mask = __raw_readl(b->base + IRQEN) | b->irq_fwd_mask;
> >         if (b->can_wake) {
> >                 reg = b->saved_mask | gc->wake_active;
> > -               __raw_writel(reg, b->base);
> > +               __raw_writel(reg, b->base + IRQEN);
> >         }
> >         irq_gc_unlock(gc);
> >  }
> > @@ -81,7 +81,7 @@ static void bcm7120_l2_intc_resume(struct irq_data *d)
> >  
> >         /* Restore the saved mask */
> >         irq_gc_lock(gc);
> > -       __raw_writel(b->saved_mask, b->base);
> > +       __raw_writel(b->saved_mask, b->base + IRQEN);
> >         irq_gc_unlock(gc);
> > 
> 
> You should really change this one too, to use fixed-endian accessors.
> __raw_writel can't safely be used in drivers, and it will break
> big-endian kernels running on ARM BRCMSTB.

As you already fix this in patch 6, please disregard my comment above,
your patch looks ok.

Acked-by: Arnd Bergmann <arnd@...db.de>
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