Re: [PATCH] staging: wfx: fix an undefined reference error when CONFIG_MMC=m

[zhong jiang]

On 2019/10/11 17:02, Greg KH wrote:
> On Fri, Oct 11, 2019 at 08:40:08AM +0000, Jerome Pouiller wrote:
>> On Friday 11 October 2019 06:26:16 CEST Greg KH wrote:
>>> CAUTION: This email originated from outside of the organization. Do not 
>> click links or open attachments unless you recognize the sender and know the 
>> content is safe.
>>>
>>> On Fri, Oct 11, 2019 at 11:02:19AM +0800, zhong jiang wrote:
>>>> I hit the following error when compile the kernel.
>>>>
>>>> drivers/staging/wfx/main.o: In function `wfx_core_init':
>>>> /home/z00352263/linux-next/linux-next/drivers/staging/wfx/main.c:488: 
>> undefined reference to `sdio_register_driver'
>>>> drivers/staging/wfx/main.o: In function `wfx_core_exit':
>>>> /home/z00352263/linux-next/linux-next/drivers/staging/wfx/main.c:496: 
>> undefined reference to `sdio_unregister_driver'
>>>> drivers/staging/wfx/main.o:(.debug_addr+0x1a8): undefined reference to 
>> `sdio_register_driver'
>>>> drivers/staging/wfx/main.o:(.debug_addr+0x6f0): undefined reference to 
>> `sdio_unregister_driver'
>>>> Signed-off-by: zhong jiang <zhongji...@huawei.com>
>>>> ---
>>>>  drivers/staging/wfx/Kconfig  | 3 ++-
>>>>  drivers/staging/wfx/Makefile | 5 +++--
>>>>  2 files changed, 5 insertions(+), 3 deletions(-)
>>>>
>>>> diff --git a/drivers/staging/wfx/Kconfig b/drivers/staging/wfx/Kconfig
>>>> index 9b8a1c7..4d045513 100644
>>>> --- a/drivers/staging/wfx/Kconfig
>>>> +++ b/drivers/staging/wfx/Kconfig
>>>> @@ -1,7 +1,8 @@
>>>>  config WFX
>>>>       tristate "Silicon Labs wireless chips WF200 and further"
>>>>       depends on MAC80211
>>>> -     depends on (SPI || MMC)
>>>> +     depends on SPI
>>>> +     select MMC
>>> How about:
>>>         depends on (SPI && MMC)
>> I dislike to force user to enable both buses while only one of them is 
>> sufficient. I would prefer to keep current dependencies and to add
>> #ifdef around problematic functions.
> Yes, that's the better thing to do here overall.
>
> zhong, can you work on that?
How about the following patch ?

diff --git a/drivers/staging/wfx/Makefile b/drivers/staging/wfx/Makefile
index 0d9c1ed..77d68b7 100644
--- a/drivers/staging/wfx/Makefile
+++ b/drivers/staging/wfx/Makefile
@@ -19,6 +19,6 @@ wfx-y := \
        sta.o \
        debug.o
 wfx-$(CONFIG_SPI) += bus_spi.o
-wfx-$(subst m,y,$(CONFIG_MMC)) += bus_sdio.o
+wfx-$(CONFIG_MMC) += bus_sdio.o

 obj-$(CONFIG_WFX) += wfx.o
diff --git a/drivers/staging/wfx/main.c b/drivers/staging/wfx/main.c
index d2508bc..26720a4 100644
--- a/drivers/staging/wfx/main.c
+++ b/drivers/staging/wfx/main.c
@@ -484,16 +484,19 @@ static int __init wfx_core_init(void)

        if (IS_ENABLED(CONFIG_SPI))
                ret = spi_register_driver(&wfx_spi_driver);
-       if (IS_ENABLED(CONFIG_MMC) && !ret)
+#ifdef CONFIG_MMC
+       if (!ret)
                ret = sdio_register_driver(&wfx_sdio_driver);
+#endif
        return ret;
 }
 module_init(wfx_core_init);

 static void __exit wfx_core_exit(void)
 {
-       if (IS_ENABLED(CONFIG_MMC))
-               sdio_unregister_driver(&wfx_sdio_driver);
+#ifdef CONFIG_MMC
+       sdio_unregister_driver(&wfx_sdio_driver);
+#endif
        if (IS_ENABLED(CONFIG_SPI))
                spi_unregister_driver(&wfx_spi_driver);
 }
--

Thanks,
zhong jiang
> thanks,
>
> greg k-h
>
> .
>