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w1-gpio: Detect of_gpio_error for first gpio 

The first DT gpio is necessary for this driver, but errors returned for
of_get_gpio are ignored.

This patch adds a return value check for the first of_get_gpio.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Markus Pargmann 2013-10-29 09:19:23 +01:00 committed by Greg Kroah-Hartman
parent e6418fcc8a
commit 7cf1a122b2
1 changed files with 6 additions and 1 deletions
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7
drivers/w1/masters/w1-gpio.c
View File

@ -58,6 +58,7 @@ static int w1_gpio_probe_dt(struct platform_device *pdev)
{
struct w1_gpio_platform_data *pdata = pdev->dev.platform_data;
struct device_node *np = pdev->dev.of_node;
int gpio;
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
@ -66,7 +67,11 @@ static int w1_gpio_probe_dt(struct platform_device *pdev)
if (of_get_property(np, "linux,open-drain", NULL))
pdata->is_open_drain = 1;
pdata->pin = of_get_gpio(np, 0);
gpio = of_get_gpio(np, 0);
if (gpio < 0)
return gpio;
pdata->pin = gpio;
pdata->ext_pullup_enable_pin = of_get_gpio(np, 1);
pdev->dev.platform_data = pdata;