Patch "gpio: mpc8xxx: Correct irq handler function" has been added to the 4.8-stable tree

Patch "gpio: mpc8xxx: Correct irq handler function" has been added to the 4.8-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    gpio: mpc8xxx: Correct irq handler function

to the 4.8-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     gpio-mpc8xxx-correct-irq-handler-function.patch
and it can be found in the queue-4.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From d71cf15b865bdd45925f7b094d169aaabd705145 Mon Sep 17 00:00:00 2001
From: Liu Gang <Gang.Liu@nxp.com>
Date: Fri, 21 Oct 2016 15:31:28 +0800
Subject: gpio: mpc8xxx: Correct irq handler function

From: Liu Gang <Gang.Liu@nxp.com>

commit d71cf15b865bdd45925f7b094d169aaabd705145 upstream.

>From the beginning of the gpio-mpc8xxx.c, the "handle_level_irq"
has being used to handle GPIO interrupts in the PowerPC/Layerscape
platforms. But actually, almost all PowerPC/Layerscape platforms
assert an interrupt request upon either a high-to-low change or
any change on the state of the signal.

So the "handle_level_irq" is not reasonable for PowerPC/Layerscape
GPIO interrupt, it should be "handle_edge_irq". Otherwise the system
may lost some interrupts from the PIN's state changes.

Signed-off-by: Liu Gang <Gang.Liu@nxp.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpio/gpio-mpc8xxx.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpio/gpio-mpc8xxx.c
+++ b/drivers/gpio/gpio-mpc8xxx.c
@@ -239,7 +239,7 @@ static int mpc8xxx_gpio_irq_map(struct i
 				irq_hw_number_t hwirq)
 {
 	irq_set_chip_data(irq, h->host_data);
-	irq_set_chip_and_handler(irq, &mpc8xxx_irq_chip, handle_level_irq);
+	irq_set_chip_and_handler(irq, &mpc8xxx_irq_chip, handle_edge_irq);
 
 	return 0;
 }


Patches currently in stable-queue which might be from Gang.Liu@nxp.com are

queue-4.8/gpio-mpc8xxx-correct-irq-handler-function.patch