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

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Message-ID: <12783106.5y3em8Tzu2@wuerfel>
Date:	Wed, 29 Oct 2014 08:46 +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 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.

	Arnd
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