Bluetooth: Add dummy handler for LE SC keypress notification

Since we don not actively try to clear the keypress notification bit we
might get these PDUs. To avoid failing the pairing process add a simple
dummy handler for these for now.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index 9a4ce45..918ce03 100644
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -2346,6 +2346,16 @@
 	return 0;
 }
 
+static int smp_cmd_keypress_notify(struct l2cap_conn *conn,
+				   struct sk_buff *skb)
+{
+	struct smp_cmd_keypress_notify *kp = (void *) skb->data;
+
+	BT_DBG("value 0x%02x", kp->value);
+
+	return 0;
+}
+
 static int smp_sig_channel(struct l2cap_chan *chan, struct sk_buff *skb)
 {
 	struct l2cap_conn *conn = chan->conn;
@@ -2438,6 +2448,10 @@
 		reason = smp_cmd_dhkey_check(conn, skb);
 		break;
 
+	case SMP_CMD_KEYPRESS_NOTIFY:
+		reason = smp_cmd_keypress_notify(conn, skb);
+		break;
+
 	default:
 		BT_DBG("Unknown command code 0x%2.2x", code);
 		reason = SMP_CMD_NOTSUPP;