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Date: Sat, 24 Jan 2015 18:48:26 +0100 (CET)
From: Thomas Gleixner <tglx@linutronix.de>
To: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
cc: Russell King <linux@arm.linux.org.uk>, Jason Cooper <jason@lakedaemon.net>,
        Linus Walleij <linus.walleij@linaro.org>,
        Andrea Adami <andrea.adami@gmail.com>,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/5] ARM: sa1100: use ioremapped memory to access SC
 registers
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On Thu, 15 Jan 2015, Dmitry Eremin-Solenikov wrote:
>  static void sa1100_mask_irq(struct irq_data *d)
>  {
> -	ICMR &= ~BIT(d->hwirq);
> +	u32 reg;
> +	unsigned long flags;
> +
> +	raw_spin_lock_irqsave(&lock, flags);

What's the exact point of that lock? And how is it related to the
$subject of the patch?

Thanks,

	tglx