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>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/w1/masters/w1-gpio.c b/drivers/w1/masters/w1-gpio.c
index f54ece268c98..ae53e8832845 100644
--- a/drivers/w1/masters/w1-gpio.c
+++ b/drivers/w1/masters/w1-gpio.c
@@ -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;