gpio: No NULL owner

Sometimes a GPIO is fetched with NULL as parent device, and
that is just fine. So under these circumstances, avoid using
dev_name() to provide a name for the GPIO line.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index bf083bc58d304b178c5131222e4f2a7ecdd1572b..4092b8601c4e5f959578487f904c6f180c7e93ba 100644 (file)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -3623,6 +3623,8 @@ struct gpio_desc *__must_check gpiod_get_index(struct device *dev,
        struct gpio_desc *desc = NULL;
        int status;
        enum gpio_lookup_flags lookupflags = 0;
+       /* Maybe we have a device name, maybe not */
+       const char *devname = dev ? dev_name(dev) : "?";
 
        dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id);
 
@@ -3651,8 +3653,11 @@ struct gpio_desc *__must_check gpiod_get_index(struct device *dev,
                return desc;
        }
 
-       /* If a connection label was passed use that, else use the device name as label */
-       status = gpiod_request(desc, con_id ? con_id : dev_name(dev));
+       /*
+        * If a connection label was passed use that, else attempt to use
+        * the device name as label
+        */
+       status = gpiod_request(desc, con_id ? con_id : devname);
        if (status < 0)
                return ERR_PTR(status);