[PATCH] Bluetooth: btmtk: Fix btmtk.c undefined reference build error

[Chris Lu <chris.lu@mediatek.com>]

MediaTek move some usb interface related function to btmtk.c which
may cause build failed if BT USB Kconfig wasn't enabled.
Fix undefined reference by adding config check.

Fixes: 39a9e1c69e74 Bluetooth: btmtk: move btusb_mtk_hci_wmt_sync to btmtk.c
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202407091928.AH0aGZnx-lkp@intel.com/
Signed-off-by: Chris Lu <chris.lu@mediatek.com>
---
 drivers/bluetooth/btmtk.c | 2 ++
 drivers/bluetooth/btmtk.h | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/drivers/bluetooth/btmtk.c b/drivers/bluetooth/btmtk.c
index b7c348687a77..9789296ad4f6 100644
--- a/drivers/bluetooth/btmtk.c
+++ b/drivers/bluetooth/btmtk.c
@@ -437,6 +437,7 @@ int btmtk_process_coredump(struct hci_dev *hdev, struct sk_buff *skb)
 }
 EXPORT_SYMBOL_GPL(btmtk_process_coredump);
 
+#if IS_ENABLED(CONFIG_BT_HCIBTUSB_MTK)
 static void btmtk_usb_wmt_recv(struct urb *urb)
 {
 	struct hci_dev *hdev = urb->context;
@@ -1487,6 +1488,7 @@ int btmtk_usb_shutdown(struct hci_dev *hdev)
 	return 0;
 }
 EXPORT_SYMBOL_GPL(btmtk_usb_shutdown);
+#endif
 
 MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>");
 MODULE_AUTHOR("Mark Chen <mark-yw.chen@mediatek.com>");
diff --git a/drivers/bluetooth/btmtk.h b/drivers/bluetooth/btmtk.h
index 453ed5131a37..890dbe9beff8 100644
--- a/drivers/bluetooth/btmtk.h
+++ b/drivers/bluetooth/btmtk.h
@@ -165,6 +165,7 @@ struct btmtk_data {
 	btmtk_reset_sync_func_t reset_sync;
 	struct btmtk_coredump_info cd_info;
 
+#if IS_ENABLED(CONFIG_BT_HCIBTUSB_MTK)
 	struct usb_device *udev;
 	struct usb_interface *intf;
 	struct usb_anchor *ctrl_anchor;
@@ -177,6 +178,7 @@ struct btmtk_data {
 
 	/* spinlock for ISO data transmission */
 	spinlock_t isorxlock;
+#endif
 };
 
 typedef int (*wmt_cmd_sync_func_t)(struct hci_dev *,
@@ -202,6 +204,7 @@ int btmtk_process_coredump(struct hci_dev *hdev, struct sk_buff *skb);
 void btmtk_fw_get_filename(char *buf, size_t size, u32 dev_id, u32 fw_ver,
 			   u32 fw_flavor);
 
+#if IS_ENABLED(CONFIG_BT_HCIBTUSB_MTK)
 int btmtk_usb_subsys_reset(struct hci_dev *hdev, u32 dev_id);
 
 int btmtk_usb_recv_acl(struct hci_dev *hdev, struct sk_buff *skb);
@@ -216,6 +219,7 @@ int btmtk_usb_suspend(struct hci_dev *hdev);
 int btmtk_usb_setup(struct hci_dev *hdev);
 
 int btmtk_usb_shutdown(struct hci_dev *hdev);
+#endif
 #else
 
 static inline int btmtk_set_bdaddr(struct hci_dev *hdev,
-- 
2.18.0