linux-kernel - Re: [PATCH] ath9k: fix build error with LEDS

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Message-Id: <20210128073008.A219DC43466@smtp.codeaurora.org>
Date:   Thu, 28 Jan 2021 07:30:08 +0000 (UTC)
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     ath9k-devel@....qualcomm.com,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Johannes Berg <johannes@...solutions.net>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Flavio Suligoi <f.suligoi@...m.it>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ath9k: fix build error with LEDS_CLASS=m

Arnd Bergmann <arnd@...nel.org> wrote:

> From: Arnd Bergmann <arnd@...db.de>
> 
> When CONFIG_ATH9K is built-in but LED support is in a loadable
> module, both ath9k drivers fails to link:
> 
> x86_64-linux-ld: drivers/net/wireless/ath/ath9k/gpio.o: in function `ath_deinit_leds':
> gpio.c:(.text+0x36): undefined reference to `led_classdev_unregister'
> x86_64-linux-ld: drivers/net/wireless/ath/ath9k/gpio.o: in function `ath_init_leds':
> gpio.c:(.text+0x179): undefined reference to `led_classdev_register_ext'
> 
> The problem is that the 'imply' keyword does not enforce any dependency
> but is only a weak hint to Kconfig to enable another symbol from a
> defconfig file.
> 
> Change imply to a 'depends on LEDS_CLASS' that prevents the incorrect
> configuration but still allows building the driver without LED support.
> 
> The 'select MAC80211_LEDS' is now ensures that the LED support is
> actually used if it is present, and the added Kconfig dependency
> on MAC80211_LEDS ensures that it cannot be enabled manually when it
> has no effect.
> 
> Fixes: 197f466e93f5 ("ath9k_htc: Do not select MAC80211_LEDS by default")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Acked-by: Johannes Berg <johannes@...solutions.net>

Patch applied to wireless-drivers.git, thanks.

b64acb28da83 ath9k: fix build error with LEDS_CLASS=m

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20210125113654.2408057-1-arnd@kernel.org/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches