linux-kernel - Re: [PATCH RESEND v2] staging: wfx: fix an undefined reference error when CONFIG

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Date:   Mon, 14 Oct 2019 10:06:25 +0000
From:   Jerome Pouiller <Jerome.Pouiller@...abs.com>
To:     zhong jiang <zhongjiang@...wei.com>
CC:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RESEND v2] staging: wfx: fix an undefined reference error
 when CONFIG_MMC=m

On Monday 14 October 2019 11:53:19 CEST Jérôme Pouiller wrote:
[...]
> Hello Zhong,
> 
> Now, I see the problem. It happens when CONFIG_MMC=m and CONFIG_WFX=y
> (if CONFIG_WFX=m, it works).
> 
> I think the easiest way to solve problem is to disallow CONFIG_WFX=y if 
> CONFIG_MMC=m.
> 
> This solution impacts users who want to use SPI bus with configuration:
> CONFIG_WFX=y + CONFIG_SPI=y + CONFIG_MMC=m. However, I think this is a
> twisted case. So, I think it won't be missed.
> 
> I think that patch below do the right thing:
> 
> -----8<----------8<----------------------8<-----------------
> 
> diff --git i/drivers/staging/wfx/Kconfig w/drivers/staging/wfx/Kconfig
> index 9b8a1c7a9e90..833f3b05b6b4 100644
> --- i/drivers/staging/wfx/Kconfig
> +++ w/drivers/staging/wfx/Kconfig
> @@ -1,7 +1,7 @@
>  config WFX
>         tristate "Silicon Labs wireless chips WF200 and further"
>         depends on MAC80211
> -       depends on (SPI || MMC)
> +       depends on (MMC=m && m) || MMC=y || (SPI && MMC!=m)
>         help
>           This is a driver for Silicons Labs WFxxx series (WF200 and further)
>           chipsets. This chip can be found on SPI or SDIO buses.
> 
> 
> 

An alternative (more understandable?):

diff --git i/drivers/staging/wfx/Kconfig w/drivers/staging/wfx/Kconfig
index 9b8a1c7a9e90..83ee4d0ca8c6 100644
--- i/drivers/staging/wfx/Kconfig
+++ w/drivers/staging/wfx/Kconfig
@@ -1,6 +1,7 @@
 config WFX
        tristate "Silicon Labs wireless chips WF200 and further"
        depends on MAC80211
+       depends on MMC || !MMC # do not allow WFX=y if MMC=m
        depends on (SPI || MMC)
        help
          This is a driver for Silicons Labs WFxxx series (WF200 and further)


-- 
Jérôme Pouiller