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

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Message-ID: <CALT56yP+PGCnbUN0BB4QTQ6phxmqL43vRoS_rtoMrgfjAtr3Rw@mail.gmail.com>
Date:	Sat, 24 Jan 2015 21:50:53 +0400
From:	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
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 <linux-arm-kernel@...ts.infradead.org>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/5] ARM: sa1100: use ioremapped memory to access SC registers

2015-01-24 20:48 GMT+03:00 Thomas Gleixner <tglx@...utronix.de>:
> 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?

It is needed to protect ICMR register during RMW cycle, isn't it?
I might have missed locks around ack/mask/unmask calls from irq
core. If so, I can happily drop this spinlock.

-- 
With best wishes
Dmitry
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