From: Russell King <rmk+kernel@arm.linux.org.uk>
Date: Tue, 16 Jun 2015 22:06:45 +0000 (+0100)
Subject: gpio: gpio-mxs: Fix race in installing chained IRQ handler
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a44735f421b44724d52117358573f8ded473ecc7;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

gpio: gpio-mxs: Fix race in installing chained IRQ handler

Fix a race where a pending interrupt could be received and the handler
called before the handler's data has been setup, by converting to
irq_set_chained_handler_and_data().

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Alexandre Courbot <gnurou@gmail.com>
Cc: Hans Ulli Kroll <ulli.kroll@googlemail.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/E1Z4z0H-0002Sf-P9@rmk-PC.arm.linux.org.uk
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---

diff --git a/drivers/gpio/gpio-mxs.c b/drivers/gpio/gpio-mxs.c
index 84cbda6acdda..eac872748ee7 100644
--- a/drivers/gpio/gpio-mxs.c
+++ b/drivers/gpio/gpio-mxs.c
@@ -320,8 +320,8 @@ static int mxs_gpio_probe(struct platform_device *pdev)
 	mxs_gpio_init_gc(port, irq_base);
 
 	/* setup one handler for each entry */
-	irq_set_chained_handler(port->irq, mxs_gpio_irq_handler);
-	irq_set_handler_data(port->irq, port);
+	irq_set_chained_handler_and_data(port->irq, mxs_gpio_irq_handler,
+					 port);
 
 	err = bgpio_init(&port->bgc, &pdev->dev, 4,
 			 port->base + PINCTRL_DIN(port),