[PATCH] Bluetooth: btmtk: Fix function-declaration build error

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

Separate out the declaration of usb related function into another
if/else condition in btmtk.h, avoiding function-declaration issue
happened when CONFIG_BT_HCIBTUSB was defined but CONFIG_BT_HCIBTUSB_MTK
wasn't.

'btmtk_usb_subsys_reset';
ISO C99 and later do not support implicit
function declarations [-Wimplicit-function-declaration]
'alloc_mtk_intr_urb';
ISO C99 and later do not support implicit
function declarations [-Wimplicit-function-declaration]
'btmtk_usb_setup';
ISO C99 and later do not support implicit
function declarations [-Wimplicit-function-declaration]
'btmtk_usb_shutdown';ISO C99 and later do not support
implicit function declarations [-Wimplicit-function-declaration]

Fixes: 52828ea60dfd ("Bluetooth: btmtk: Fix btmtk.c undefined reference build error")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202407200904.hRqT3JKD-lkp@intel.com/
Signed-off-by: Chris Lu <chris.lu@mediatek.com>
---
 drivers/bluetooth/btmtk.h | 35 ++++++++++++++++++-----------------
 1 file changed, 18 insertions(+), 17 deletions(-)

diff --git a/drivers/bluetooth/btmtk.h b/drivers/bluetooth/btmtk.h
index 6fc69cd8636b..fcc44800cf29 100644
--- a/drivers/bluetooth/btmtk.h
+++ b/drivers/bluetooth/btmtk.h
@@ -201,23 +201,6 @@ 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);
-
-struct urb *alloc_mtk_intr_urb(struct hci_dev *hdev, struct sk_buff *skb,
-			       usb_complete_t tx_complete);
-
-int btmtk_usb_resume(struct hci_dev *hdev);
-
-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,
@@ -259,7 +242,25 @@ static inline void btmtk_fw_get_filename(char *buf, size_t size, u32 dev_id,
 					 u32 fw_ver, u32 fw_flavor)
 {
 }
+#endif
+
+/* USB interface related functions */
+#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);
+
+struct urb *alloc_mtk_intr_urb(struct hci_dev *hdev, struct sk_buff *skb,
+			       usb_complete_t tx_complete);
 
+int btmtk_usb_resume(struct hci_dev *hdev);
+
+int btmtk_usb_suspend(struct hci_dev *hdev);
+
+int btmtk_usb_setup(struct hci_dev *hdev);
+
+int btmtk_usb_shutdown(struct hci_dev *hdev);
+#else
 static inline int btmtk_usb_subsys_reset(struct hci_dev *hdev, u32 dev_id)
 {
 	return -EOPNOTSUPP;
-- 
2.18.0