From: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Date: Tue, 16 Sep 2014 13:23:15 +0000 (+0300)
Subject: gpio: Fix potential NULL handler data in chained irqchip handler
X-Git-Tag: firefly_0821_release~176^2~3175^2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=324b0398781e7afb846378dd2d8a4374faaf236b;p=firefly-linux-kernel-4.4.55.git

gpio: Fix potential NULL handler data in chained irqchip handler

There is possibility with misconfigured pins that interrupt occurs instantly
after setting irq_set_chained_handler() in gpiochip_set_chained_irqchip().
Now if handler gets called before irq_set_handler_data() the handler gets
NULL handler data.

Fix this by moving irq_set_handler_data() call before
irq_set_chained_handler() in gpiochip_set_chained_irqchip().

Cc: Stable <stable@vger.kernel.org> # 3.15+
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
---

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 3b54edf2befe..c68d037de656 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -413,12 +413,12 @@ void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip,
 		return;
 	}
 
-	irq_set_chained_handler(parent_irq, parent_handler);
 	/*
 	 * The parent irqchip is already using the chip_data for this
 	 * irqchip, so our callbacks simply use the handler_data.
 	 */
 	irq_set_handler_data(parent_irq, gpiochip);
+	irq_set_chained_handler(parent_irq, parent_handler);
 }
 EXPORT_SYMBOL_GPL(gpiochip_set_chained_irqchip);