linux-kernel - [PATCH] Bluetooth: btusb: avoid unused function warning

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Message-Id: <20190918195918.2190556-1-arnd@arndb.de>
Date:   Wed, 18 Sep 2019 21:59:02 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Alex Lu <alex_lu@...lsil.com.cn>,
        Matthias Kaehlcke <mka@...omium.org>,
        Rajat Jain <rajatja@...gle.com>,
        Raghuram Hegde <raghuram.hegde@...el.com>,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] Bluetooth: btusb: avoid unused function warning

The btusb_rtl_cmd_timeout() function is used inside of an
ifdef, leading to a warning when this part is hidden
from the compiler:

drivers/bluetooth/btusb.c:530:13: error: unused function 'btusb_rtl_cmd_timeout' [-Werror,-Wunused-function]

Use an IS_ENABLED() check instead so the compiler can see
the code and then discard it silently.

Fixes: d7ef0d1e3968 ("Bluetooth: btusb: Use cmd_timeout to reset Realtek device")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/bluetooth/btusb.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index a9c35ebb30f8..23e606aaaea4 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -3807,8 +3807,8 @@ static int btusb_probe(struct usb_interface *intf,
 		btusb_check_needs_reset_resume(intf);
 	}
 
-#ifdef CONFIG_BT_HCIBTUSB_RTL
-	if (id->driver_info & BTUSB_REALTEK) {
+	if (IS_ENABLED(CONFIG_BT_HCIBTUSB_RTL) &&
+	    (id->driver_info & BTUSB_REALTEK)) {
 		hdev->setup = btrtl_setup_realtek;
 		hdev->shutdown = btrtl_shutdown_realtek;
 		hdev->cmd_timeout = btusb_rtl_cmd_timeout;
@@ -3819,7 +3819,6 @@ static int btusb_probe(struct usb_interface *intf,
 		 */
 		set_bit(BTUSB_WAKEUP_DISABLE, &data->flags);
 	}
-#endif
 
 	if (id->driver_info & BTUSB_AMP) {
 		/* AMP controllers do not support SCO packets */
-- 
2.20.0