linux-kernel - Re: [PATCH] machine_power_off: not only local_irq

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Message-ID: <20140706153542.GU21766@n2100.arm.linux.org.uk>
Date:	Sun, 6 Jul 2014 16:35:43 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	pawandeep oza <oza.contri.linux.kernel@...il.com>
Cc:	akpm@...ux-foundation.org, holt@....com, mingo@...nel.org,
	sboyd@...eaurora.org, k.khlebnikov@...sung.com,
	u.kleine-koenig@...gutronix.de,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	linux-arm-kernel@...ts.infradead.or, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] machine_power_off: not only local_irq_disable but also
	do disable preemption

On Sun, Jul 06, 2014 at 08:20:36PM +0530, pawandeep oza wrote:
> just to add to this,
> this scenerio happened on the platform which I am working on,
> where interrupts were being re-enabled in rpm_callback path...because the

Can you explain how you get to the runtime callback paths from the
system reboot/shutdown handlers?

In any case, calling the plain _irq (rather than _irqsave) variants of
spinlocks when IRQs are already disabled is (another) bug.  The plain
_irq variants are not permitted when IRQs have been previously
disabled.

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