linux-kernel - [PATCH 3.12 09/72] gpio: mpc8xxx: Correct irq handler function

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Message-Id: <11db4e7901836c9ad0e4b2a014b9a93279494af3.1478523828.git.jslaby@suse.cz>
Date:   Mon,  7 Nov 2016 14:04:16 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Liu Gang <Gang.Liu@....com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 09/72] gpio: mpc8xxx: Correct irq handler function

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

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

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@....com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/gpio/gpio-mpc8xxx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c
index 2aa3ca215bd6..d5376aa1c5e1 100644
--- a/drivers/gpio/gpio-mpc8xxx.c
+++ b/drivers/gpio/gpio-mpc8xxx.c
@@ -295,7 +295,7 @@ static int mpc8xxx_gpio_irq_map(struct irq_domain *h, unsigned int virq,
 		mpc8xxx_irq_chip.irq_set_type = mpc8xxx_gc->of_dev_id_data;
 
 	irq_set_chip_data(virq, h->host_data);
-	irq_set_chip_and_handler(virq, &mpc8xxx_irq_chip, handle_level_irq);
+	irq_set_chip_and_handler(virq, &mpc8xxx_irq_chip, handle_edge_irq);
 
 	return 0;
 }
-- 
2.10.2