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Subject: Re: [PATCH/RFC] soc: bcm2835: Make !RASPBERRYPI_FIRMWARE dummies
 return failure
To:     Geert Uytterhoeven <geert@linux-m68k.org>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Ray Jui <rjui@broadcom.com>,
        Scott Branden <sbranden@broadcom.com>,
        bcm-kernel-feedback-list@broadcom.com,
        Eric Anholt <eric@anholt.net>,
        Stefan Wahren <stefan.wahren@i2se.com>,
        Dave Stevenson <dave.stevenson@raspberrypi.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     Arnd Bergmann <arnd@arndb.de>,
        linux-rpi-kernel@lists.infradead.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
References: <1523178315-30562-1-git-send-email-geert@linux-m68k.org>
From:   Florian Fainelli <f.fainelli@gmail.com>
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Message-ID: <c158783d-dd08-c197-8fc7-a0c56571743e@gmail.com>
Date:   Fri, 13 Apr 2018 15:11:11 -0700
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On 04/08/2018 02:05 AM, Geert Uytterhoeven wrote:
> If CONFIG_RASPBERRYPI_FIRMWARE=n:
> 
>     drivers/gpio/gpio-raspberrypi-exp.c: In function ‘rpi_exp_gpio_get_polarity’:
>     drivers/gpio/gpio-raspberrypi-exp.c:71: warning: ‘get.polarity’ is used uninitialized in this function
>     drivers/gpio/gpio-raspberrypi-exp.c: In function ‘rpi_exp_gpio_get_direction’:
>     drivers/gpio/gpio-raspberrypi-exp.c:150: warning: ‘get.direction’ is used uninitialized in this function
> 
> The dummy firmware interface functions return 0, which means success,
> causing subsequent code to make use of the never initialized output
> parameter.
> 
> Fix this by making the dummy functions return an error code (-ENOSYS)
> instead.
> 
> Note that this assumes the firmware always fills in the requested data
> in the CONFIG_RASPBERRYPI_FIRMWARE=y case.
> 
> Fixes: d45f1a563b92dac7 ("staging: vc04_services: fix up rpi firmware functions")
> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

Applied, thanks Geert!
-- 
Florian