+static int ath79_request_ext_lna_gpio(unsigned chain, int gpio)
+{
-+ char buf[32];
+ char *label;
+ int err;
+
-+ scnprintf(buf, sizeof(buf), "external LNA%u", chain);
-+ label = kstrdup(buf, GFP_KERNEL);
++ label = kasprintf(GFP_KERNEL, "external LNA%u", chain);
++ if (!label)
++ return -ENOMEM;
+
+ err = gpio_request_one(gpio, GPIOF_DIR_OUT | GPIOF_INIT_LOW, label);
+ if (err) {