Bluetooth: Don't send unnecessary write_le_enable command

If the local host features indicate that LE is already in the state that
is desired there's no point in sending the HCI command to try to change
the setting.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>

net/bluetooth/mgmt.c

@@ -1260,7 +1260,7 @@ static int set_le(struct sock *sk, u16 index, void *data, u16 len)
 	struct pending_cmd *cmd;
 	struct hci_dev *hdev;
 	int err;
-	u8 val;
+	u8 val, enabled;
 
 	BT_DBG("request for hci%u", index);
 
@@ -1280,8 +1280,9 @@ static int set_le(struct sock *sk, u16 index, void *data, u16 len)
 	}
 
 	val = !!cp->val;
+	enabled = !!(hdev->host_features[0] & LMP_HOST_LE);
 
-	if (!hdev_is_powered(hdev)) {
+	if (!hdev_is_powered(hdev) || val == enabled) {
 		bool changed = false;
 
 		if (val != test_bit(HCI_LE_ENABLED, &hdev->dev_flags)) {