[PATCH v2 04/10] gpiolib: fix gpio name memory leak

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

From: Marco Felsch <m.felsch@pengutronix.de>

We never freed the name allocated by xstrdup(). Fix this by use the
const devicetree property value. While on it check if the name is valid
and add the comment to align the code with the kernel.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Reviewed-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
v1 -> v2:
  - no change
---
 drivers/gpio/gpiolib.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index eb2bba042e49..f05e2ac7356a 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -18,7 +18,7 @@ struct gpio_info {
 	bool requested;
 	bool active_low;
 	char *label;
-	char *name;
+	const char *name;
 };
 
 static struct gpio_info *gpio_desc;
@@ -537,8 +537,16 @@ static int of_gpiochip_scan_hogs(struct gpio_chip *chip)
 		if (count > chip->ngpio)
 			count = chip->ngpio;
 
-		for (i = 0; i < count; i++)
-			gpio_desc[chip->base + i].name = xstrdup(names[i]);
+		for (i = 0; i < count; i++) {
+			/*
+			 * Allow overriding "fixed" names provided by the GPIO
+			 * provider. The "fixed" names are more often than not
+			 * generic and less informative than the names given in
+			 * device properties.
+			 */
+			if (names[i] && names[i][0])
+				gpio_desc[chip->base + i].name = names[i];
+		}
 
 		free(names);
 	}
-- 
2.39.2