linux-kernel - [PATCH] regulator: gpio-regulator: Don't oops on missing regulator-type property

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Message-Id: <1383999148-2516-1-git-send-email-laurent.pinchart+renesas@ideasonboard.com>
Date:	Sat,  9 Nov 2013 13:12:28 +0100
From:	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
To:	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>
Cc:	linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] 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@...asonboard.com>
---
 drivers/regulator/gpio-regulator.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/regulator/gpio-regulator.c b/drivers/regulator/gpio-regulator.c
index 98a98ff..bcd827c 100644
--- 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;
-- 
Regards,

Laurent Pinchart

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