diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
index 73fc701204e29bf8d17b9ff632c5518aca8f92ea..90d2c536bdaf068abcec2c28cf0f505b2ba097f9 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
@@ -96,13 +96,13 @@ void brcmf_of_probe(struct device *dev, enum brcmf_bus_type bus_type,
 	/* Set board-type to the first string of the machine compatible prop */
 	root = of_find_node_by_path("/");
 	if (root && err) {
-		char *board_type;
+		char *board_type = NULL;
 		const char *tmp;
 
-		of_property_read_string_index(root, "compatible", 0, &tmp);
-
 		/* get rid of '/' in the compatible string to be able to find the FW */
-		board_type = devm_kstrdup(dev, tmp, GFP_KERNEL);
+		if (!of_property_read_string_index(root, "compatible", 0, &tmp))
+			board_type = devm_kstrdup(dev, tmp, GFP_KERNEL);
+
 		if (!board_type) {
 			of_node_put(root);
 			return;