Bluetooth: btusb: mediatek: change the conditions for ISO interface

commit defc33b upstream.

Change conditions for Bluetooth driver claiming and releasing usb
ISO interface for MediaTek ISO data transmission.

Signed-off-by: Chris Lu <chris.lu@mediatek.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Cc: Fedor Pchelkin <boddah8794@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: ChrisCH-Lu

drivers/bluetooth/btusb.c

@@ -2648,7 +2648,7 @@ static void btusb_mtk_release_iso_intf(struct hci_dev *hdev)
 {
 	struct btmtk_data *btmtk_data = hci_get_priv(hdev);
 
-	if (btmtk_data->isopkt_intf) {
+	if (test_bit(BTMTK_ISOPKT_OVER_INTR, &btmtk_data->flags)) {
 		usb_kill_anchored_urbs(&btmtk_data->isopkt_anchor);
 		clear_bit(BTMTK_ISOPKT_RUNNING, &btmtk_data->flags);
 
@@ -2688,8 +2688,8 @@ static int btusb_mtk_reset(struct hci_dev *hdev, void *rst_data)
 	if (err < 0)
 		return err;
 
-	if (test_bit(BTMTK_ISOPKT_RUNNING, &btmtk_data->flags))
-		btusb_mtk_release_iso_intf(hdev);
+	/* Release MediaTek ISO data interface */
+	btusb_mtk_release_iso_intf(hdev);
 
 	btusb_stop_traffic(data);
 	usb_kill_anchored_urbs(&data->tx_anchor);
@@ -2734,22 +2734,22 @@ static int btusb_mtk_setup(struct hci_dev *hdev)
 	btmtk_data->reset_sync = btusb_mtk_reset;
 
 	/* Claim ISO data interface and endpoint */
-	btmtk_data->isopkt_intf = usb_ifnum_to_if(data->udev, MTK_ISO_IFNUM);
-	if (btmtk_data->isopkt_intf)
+	if (!test_bit(BTMTK_ISOPKT_OVER_INTR, &btmtk_data->flags)) {
+		btmtk_data->isopkt_intf = usb_ifnum_to_if(data->udev, MTK_ISO_IFNUM);
 		btusb_mtk_claim_iso_intf(data);
+	}
 
 	return btmtk_usb_setup(hdev);
 }
 
 static int btusb_mtk_shutdown(struct hci_dev *hdev)
 {
-	struct btmtk_data *btmtk_data = hci_get_priv(hdev);
 	int ret;
 
 	ret = btmtk_usb_shutdown(hdev);
 
-	if (test_bit(BTMTK_ISOPKT_RUNNING, &btmtk_data->flags))
-		btusb_mtk_release_iso_intf(hdev);
+	/* Release MediaTek iso interface after shutdown */
+	btusb_mtk_release_iso_intf(hdev);
 
 	return ret;
 }