regulator: gpio-regulator: Don't oops on missing regulator-type property

Catch missing regulator-type property in DT and return an error
gracefully instead of deferencing a NULL pointer and crashing.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

diff --git a/drivers/regulator/gpio-regulator.c b/drivers/regulator/gpio-regulator.c
index 98a98ff..bcd827c 100644 (file)
--- a/drivers/regulator/gpio-regulator.c
+++ b/drivers/regulator/gpio-regulator.c
@@ -139,6 +139,7 @@ of_get_gpio_regulator_config(struct device *dev, struct device_node *np)
        struct property *prop;
        const char *regtype;
        int proplen, gpio, i;
+       int ret;
 
        config = devm_kzalloc(dev,
                        sizeof(struct gpio_regulator_config),
@@ -202,7 +203,11 @@ of_get_gpio_regulator_config(struct device *dev, struct device_node *np)
        }
        config->nr_states = i;
 
-       of_property_read_string(np, "regulator-type", &regtype);
+       ret = of_property_read_string(np, "regulator-type", &regtype);
+       if (ret < 0) {
+               dev_err(dev, "Missing 'regulator-type' property\n");
+               return ERR_PTR(-EINVAL);
+       }
 
        if (!strncmp("voltage", regtype, 7))
                config->type = REGULATOR_VOLTAGE;