linux-kernel - Re: [PATCH] mmc: rtsx: usb backend needs LED support

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Date:	Wed, 30 Apr 2014 10:19:39 +0200
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Roger <rogerable@...ltek.com>
Cc:	Arnd Bergmann <arnd@...db.de>, micky <micky_ching@...lsil.com.cn>,
	Chris Ball <chris@...ntf.net>,
	Lee Jones <lee.jones@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	devel@...uxdriverproject.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	Wei WANG <wei_wang@...lsil.com.cn>
Subject: Re: [PATCH] mmc: rtsx: usb backend needs LED support

On 30 April 2014 05:34, Roger <rogerable@...ltek.com> wrote:
>
> On 04/29/2014 08:46 PM, Arnd Bergmann wrote:
>>
>> On Tuesday 29 April 2014 13:05:15 Ulf Hansson wrote:
>>>
>>> On 29 April 2014 11:45, Arnd Bergmann <arnd@...db.de> wrote:
>>>>
>>>> drivers/built-in.o: In function `rtsx_usb_sdmmc_drv_remove':
>>>> :(.text+0x806480): undefined reference to `led_classdev_unregister'
>>>> drivers/built-in.o: In function `rtsx_usb_sdmmc_drv_probe':
>>>> :(.text+0x806708): undefined reference to `led_classdev_register'
>>>>
>>>> This adds an explicit dependency in Kconfig
>>>
>>>
>>> I think the proper solution is to fix the dependency in the driver code
>>> instead.
>>>
>>> There are already some ifdefs hackery for making it optional to use
>>> leds, apparently that's not working properly.
>>>
>>
>> Ah, right, I misinterpreted the bug. Here is a new version:
>>
>> 8<---------
>>>
>>> From 5b5588f8c9b8ded8b296fd32d87b2d118e548a29 Mon Sep 17 00:00:00 2001
>>
>> From: Arnd Bergmann <arnd@...db.de>
>> Date: Tue, 29 Apr 2014 11:41:40 +0200
>> Subject: [PATCH] mmc: rtsx: usb backend needs LED support
>>
>> Building the rtsx USB driver uses the LED classdev base
>> support if available, but that fails if the classdev
>> is a module and the MMC driver is built-in, leading to this
>> link error.
>>
>> drivers/built-in.o: In function `rtsx_usb_sdmmc_drv_remove':
>> :(.text+0x806480): undefined reference to `led_classdev_unregister'
>> drivers/built-in.o: In function `rtsx_usb_sdmmc_drv_probe':
>> :(.text+0x806708): undefined reference to `led_classdev_register'
>>
>> This adds an explicit dependency in Kconfig to ensure that
>> the MMC driver has to be a module if LEDS_CLASS is a module,
>> but still allows it to be built-in if LEDS_CLASS is either
>> disabled or built-in.
>>
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>>
>> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
>> index 92d91fe..68da9b8 100644
>>
>> --- a/drivers/mmc/host/Kconfig
>> +++ b/drivers/mmc/host/Kconfig
>> @@ -696,6 +696,7 @@ config MMC_REALTEK_PCI
>>   config MMC_REALTEK_USB
>>         tristate "Realtek USB SD/MMC Card Interface Driver"
>>         depends on MFD_RTSX_USB
>> +       depends on m || LEDS_CLASS!=m
>>
>>         help
>>           Say Y here to include driver code to support SD/MMC card
>> interface
>>           of Realtek RTS5129/39 series card reader
>>
>> .
>>
>
> I think Ulf's idea is to fix the bug by modifying the .c files.
> I really found the problem of my ifdef hackery and it should do something
> similar in sdhci.c as:
>
> From: Roger Tseng <rogerable@...ltek.com>
> Date: Wed, 30 Apr 2014 11:11:25 +0800
> Subject: [PATCH] mmc: rtsx: fix possible linking error if built-in
>
> rtsx_usb_sdmmc module uses the LED classdev if available, but the code
> failed
> to consider the situation that it is built-in and the LED classdev is a
> module,
> leading to following linking error:
>
>   LD      init/built-in.o
> drivers/built-in.o: In function `rtsx_usb_sdmmc_drv_remove':
> rtsx_usb_sdmmc.c:(.text+0x2a018e): undefined reference to
> `led_classdev_unregister'
> drivers/built-in.o: In function `rtsx_usb_sdmmc_drv_probe':
> rtsx_usb_sdmmc.c:(.text+0x2a197e): undefined reference to
> `led_classdev_register'
>
> Fix by excluding such condition when defining macro RTSX_USB_USE_LEDS_CLASS.
>
> Signed-off-by: Roger Tseng <rogerable@...ltek.com>

Acked-by: Ulf Hansson <ulf.hansson@...aro.org>

> ---
>  drivers/mmc/host/rtsx_usb_sdmmc.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/rtsx_usb_sdmmc.c
> b/drivers/mmc/host/rtsx_usb_sdmmc.c
> index e11fafa..38bdda5 100644
> --- a/drivers/mmc/host/rtsx_usb_sdmmc.c
> +++ b/drivers/mmc/host/rtsx_usb_sdmmc.c
> @@ -34,7 +34,8 @@
>  #include <linux/mfd/rtsx_usb.h>
>  #include <asm/unaligned.h>
>
> -#if defined(CONFIG_LEDS_CLASS) || defined(CONFIG_LEDS_CLASS_MODULE)
> +#if defined(CONFIG_LEDS_CLASS) || (defined(CONFIG_LEDS_CLASS_MODULE) && \
> +       defined(CONFIG_MMC_REALTEK_USB_MODULE))
>  #include <linux/leds.h>
>  #include <linux/workqueue.h>
>  #define RTSX_USB_USE_LEDS_CLASS
>
> Best regards,
> Roger Tseng
--
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