linux-kernel - Re: [PATCH] blutooth: try to improve CONFIG_SERIAL_DEV

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Message-Id: <C283C351-9806-44B8-A2E5-0B0B377156F9@holtmann.org>
Date:   Thu, 20 Apr 2017 08:55:02 +0200
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Sebastian Reichel <sre@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        "Gustavo F. Padovan" <gustavo@...ovan.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        "David S. Miller" <davem@...emloft.net>,
        Kalle Valo <kvalo@...eaurora.org>,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] blutooth: try to improve CONFIG_SERIAL_DEV_BUS dependency

Hi Sebastian,

>> With CONFIG_SERIAL_DEV_BUS=m, the hci_serdev.o file does not actually
>> get built into hci_uart.o as the Makefile doesn't pick it up, leading
>> to a link error with anything referring to it:
>> 
>> ERROR: "hci_uart_register_device" [drivers/bluetooth/hci_nokia.ko] undefined!
>> scripts/Makefile.modpost:91: recipe for target '__modpost' failed
>> 
>> Changing this in the Makefile would cause another problem when
>> hci_uart itself is built-in and cannot reference symbols from the
>> serdev module.
>> 
>> This tries to address both problems by introducing a new hidden
>> Kconfig symbol that controls both the compilation of hci_serdev.o
>> and whether the Nokia driver can be selected. This seems to address
>> the problem for me, though there might be a better way to do it.
>> 
>> Fixes: 7bb318680e86 ("Bluetooth: add nokia driver")
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>> ---
>> drivers/bluetooth/Kconfig  | 8 +++++++-
>> drivers/bluetooth/Makefile | 2 +-
>> 2 files changed, 8 insertions(+), 2 deletions(-)
>> 
>> diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
>> index 8aafbed9e160..737d93ef27c5 100644
>> --- a/drivers/bluetooth/Kconfig
>> +++ b/drivers/bluetooth/Kconfig
>> @@ -76,6 +76,12 @@ config BT_HCIUART
>> 	  Say Y here to compile support for Bluetooth UART devices into the
>> 	  kernel or say M to compile it as module (hci_uart).
>> 
>> +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
>> 	bool "UART (H4) protocol support"
>> 	depends on BT_HCIUART
>> @@ -89,7 +95,7 @@ config BT_HCIUART_H4
>> config BT_HCIUART_NOKIA
>> 	tristate "UART Nokia H4+ protocol support"
>> 	depends on BT_HCIUART
> 
> I guess BT_HCIUART dependency is no longer needed
> when we have BT_HCIUART_SERDEV dependency?

if so then we need another patch since I already applied the one from Arnd.

Regards

Marcel