linux-kernel - Re: [PATCH v2 2/2] ARM: irqchip: mxs: add Alpascale ASM9260 support

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Message-ID: <alpine.DEB.2.11.1509211105500.5606@nanos>
Date:	Mon, 21 Sep 2015 11:06:45 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Marc Zyngier <marc.zyngier@....com>
cc:	Oleksij Rempel <linux@...pel-privat.de>,
	linux-kernel@...r.kernel.org, jason@...edaemon.net,
	Oleksij Rempel <external.Oleksij.Rempel@...bosch.com>
Subject: Re: [PATCH v2 2/2] ARM: irqchip: mxs: add Alpascale ASM9260
 support

On Sun, 20 Sep 2015, Marc Zyngier wrote:
> > Uff... in one of earliest reviews i was asked to add lock..
> > I also was asked to add asm9260 to some existing driver. Not sure if it
> > is still making sense.
> 
> Adding or removing a lock is not about what people ask you to do. It is
> about requirements dictated by either the HW (you need to perform
> a given sequence atomically with respect to another code sequence), the
> kernel, or both. So I'd like to understand what is the underlying
> reason for this lock. It is not disabling interrupts, so it could end
> up being called in an interrupt context -> deadlock.

The callback is always called with interrupts disabled, so that's a
non issue. But still, the rationale for that lock is unclear.

Thanks,

	tglx

 
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