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

[Greg KH <gregkh@linuxfoundation.org>]

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 
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> > 
> > 
> > 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 <zhongjiang@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?

thanks,

greg k-h