linux-kernel - Re: [RFC v1 3/9] gpio: davinci: use chained_irq_enter/chained_irq

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Date:	Sun, 15 Dec 2013 18:55:20 +0530
From:	Sekhar Nori <nsekhar@...com>
To:	Grygorii Strashko <grygorii.strashko@...com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	<linux-gpio@...r.kernel.org>
CC:	<prabhakar.csengg@...il.com>, <linux-kernel@...r.kernel.org>,
	<davinci-linux-open-source@...ux.davincidsp.com>
Subject: Re: [RFC v1 3/9] gpio: davinci: use chained_irq_enter/chained_irq_exit
 API

On Wednesday 27 November 2013 01:10 AM, Grygorii Strashko wrote:
> It's unsafe to call IRQ chip callbacks (.irq_mask/irq_unmask/irq_ack)
> from chained IRQ handler directly. Because, Davinci GPIO block is used
> by different SoCs, which, in turn, have different Main IRQ controllers
> (Davinci - aintc, cp-intc; Keystone - arm-gic) which may introduce
> diffrent set of IRQ chip callbacks. As result, call of
> gpio_irq_handler() on Keysone will simply cause crash the system,
> because ARM-GIC implements .irq_eoi() instead of .irq_ack().
> 
> Hence, fix it by using Kernel chained_irq_enter/chained_irq_exit APIs as
> they are intended to handle exact such cases.
> 
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>

Queued with Linus's and Santosh's acks.

Thanks,
Sekhar
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