linux-kernel - [PATCH 1/2] gpio: pca953x: return IRQ

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Message-Id: <5ca82b7dd4c17ea358a1ea30bb34a3e31828b2b2.1398844809.git.toby@tismith.id.au>
Date:	Wed, 30 Apr 2014 18:01:40 +1000
From:	Toby Smith <toby@...mith.id.au>
To:	linus.walleij@...aro.org, gnurou@...il.com,
	grant.likely@...aro.org, robh+dt@...nel.org
Cc:	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, Toby Smith <toby@...mith.id.au>
Subject: [PATCH 1/2] gpio: pca953x: return IRQ_NONE when appropriate

The irq handler should return IRQ_NONE or IRQ_HANDLED to report
if we have handled the interrupt.

Signed-off-by: Toby Smith <toby@...mith.id.au>
---
 drivers/gpio/gpio-pca953x.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index d550d8e..83cc2c8 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -503,10 +503,11 @@ static irqreturn_t pca953x_irq_handler(int irq, void *devid)
 	struct pca953x_chip *chip = devid;
 	u8 pending[MAX_BANK];
 	u8 level;
+	unsigned nhandled = 0;
 	int i;
 
 	if (!pca953x_irq_pending(chip, pending))
-		return IRQ_HANDLED;
+		return IRQ_NONE;
 
 	for (i = 0; i < NBANK(chip); i++) {
 		while (pending[i]) {
@@ -514,10 +515,11 @@ static irqreturn_t pca953x_irq_handler(int irq, void *devid)
 			handle_nested_irq(irq_find_mapping(chip->domain,
 							level + (BANK_SZ * i)));
 			pending[i] &= ~(1 << level);
+			nhandled++;
 		}
 	}
 
-	return IRQ_HANDLED;
+	return (nhandled > 0) ? IRQ_HANDLED : IRQ_NONE;
 }
 
 static int pca953x_gpio_irq_map(struct irq_domain *d, unsigned int irq,
-- 
1.8.3.2

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