linux-kernel - [PATCH] [4.14 only backport] Bluetooth: BT_HCIUART now depends on SERIAL_DEV

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Date:   Fri, 16 Feb 2018 17:05:35 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     stable@...r.kernel.org
Cc:     Arnd Bergmann <arnd@...db.de>,
        Marcel Holtmann <marcel@...tmann.org>,
        Gustavo Padovan <gustavo@...ovan.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Sebastian Reichel <sre@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Tobias Regnery <tobias.regnery@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] [4.14 only backport] Bluetooth: BT_HCIUART now depends on SERIAL_DEV_BUS

commit 05e89fb576f580ac95e7a5d00bdb34830b09671a upstream.

It is no longer possible to build BT_HCIUART into the kernel
when SERIAL_DEV_BUS is a loadable module, even if none of the
SERIAL_DEV_BUS based implementations are selected:

drivers/bluetooth/hci_ldisc.o: In function `hci_uart_set_flow_control':
hci_ldisc.c:(.text+0xb40): undefined reference to `serdev_device_set_flow_control'
hci_ldisc.c:(.text+0xb5c): undefined reference to `serdev_device_set_tiocm'

This adds a dependency to avoid the broken configuration.

Fixes: 7841d554809b ("Bluetooth: hci_uart_set_flow_control: Fix NULL deref when using serdev")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Cc: stable@...r.kernel.org
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/bluetooth/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
index 98a60db8e5d1..b33c8d6eb8c7 100644
--- a/drivers/bluetooth/Kconfig
+++ b/drivers/bluetooth/Kconfig
@@ -66,6 +66,7 @@ config BT_HCIBTSDIO
 
 config BT_HCIUART
 	tristate "HCI UART driver"
+	depends on SERIAL_DEV_BUS || !SERIAL_DEV_BUS
 	depends on TTY
 	help
 	  Bluetooth HCI UART driver.
@@ -80,7 +81,6 @@ config BT_HCIUART
 config BT_HCIUART_SERDEV
 	bool
 	depends on SERIAL_DEV_BUS && BT_HCIUART
-	depends on SERIAL_DEV_BUS=y || SERIAL_DEV_BUS=BT_HCIUART
 	default y
 
 config BT_HCIUART_H4
-- 
2.9.0