linux-kernel - [PATCH 2/2] gpio: davinci: Fix the number of controllers allocated

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Date:	Thu, 28 Jan 2016 19:08:51 +0530
From:	Keerthy <j-keerthy@...com>
To:	<linus.walleij@...aro.org>, <gnurou@...il.com>
CC:	<linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<grygorii.strashko@...com>, <lokeshvutla@...com>,
	<j-keerthy@...com>
Subject: [PATCH 2/2] gpio: davinci: Fix the number of controllers allocated

From: Lokesh Vutla <lokeshvutla@...com>

Driver only needs to allocate for [ngpio / 32] controllers,
as each controller handles 32 gpios. But the current driver
allocates for ngpio of which the extra allocated are unused.
Fix it be registering only the required number of controllers.

Signed-off-by: Lokesh Vutla <lokeshvutla@...com>
Signed-off-by: Keerthy <j-keerthy@...com>
---
 drivers/gpio/gpio-davinci.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-davinci.c b/drivers/gpio/gpio-davinci.c
index c889f31..cd007a6 100644
--- a/drivers/gpio/gpio-davinci.c
+++ b/drivers/gpio/gpio-davinci.c
@@ -195,7 +195,7 @@ static int davinci_gpio_of_xlate(struct gpio_chip *gc,
 static int davinci_gpio_probe(struct platform_device *pdev)
 {
 	int i, base;
-	unsigned ngpio;
+	unsigned ngpio, nbank;
 	struct davinci_gpio_controller *chips;
 	struct davinci_gpio_platform_data *pdata;
 	struct davinci_gpio_regs __iomem *regs;
@@ -224,8 +224,9 @@ static int davinci_gpio_probe(struct platform_device *pdev)
 	if (WARN_ON(ARCH_NR_GPIOS < ngpio))
 		ngpio = ARCH_NR_GPIOS;
 
+	nbank = DIV_ROUND_UP(ngpio, 32);
 	chips = devm_kzalloc(dev,
-			     ngpio * sizeof(struct davinci_gpio_controller),
+			     nbank * sizeof(struct davinci_gpio_controller),
 			     GFP_KERNEL);
 	if (!chips)
 		return -ENOMEM;
-- 
1.9.1