From: Grygorii Strashko <grygorii.strashko@ti.com>
Date: Tue, 26 Nov 2013 19:40:09 +0000 (+0200)
Subject: gpio: davinci: use chained_irq_enter/chained_irq_exit API
X-Git-Tag: drivers-for-linus~4^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0d978eb7349941139241a99acf05de6dd49b78d1;p=pandora-kernel.git

gpio: davinci: use chained_irq_enter/chained_irq_exit API

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@ti.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
---

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