4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Linus Walleij <linus.walleij@xxxxxxxxxx> commit 7d18f0a14aa6a0d6bad39111c1fb655f07f71d59 upstream. 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@xxxxxxxxxx> Cc: Daniel Rosenberg <drosen@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpio/gpiolib.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -3204,6 +3204,8 @@ struct gpio_desc *__must_check gpiod_get 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); @@ -3232,8 +3234,11 @@ struct gpio_desc *__must_check gpiod_get 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);
