linux-kernel - Re: [PATCH 3/5] ARM: sa1100: use ioremapped memory to access SC registers

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Date:	Sat, 24 Jan 2015 18:48:26 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
cc:	Russell King <linux@....linux.org.uk>,
	Jason Cooper <jason@...edaemon.net>,
	Linus Walleij <linus.walleij@...aro.org>,
	Andrea Adami <andrea.adami@...il.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] ARM: sa1100: use ioremapped memory to access SC
 registers

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
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