linux-kernel - Re: [PATCH] iio: adc: fix uninitialized variable warning

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Date:   Sat, 9 Mar 2019 18:10:29 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-arm-msm@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: adc: fix uninitialized variable warning

On Mon,  4 Mar 2019 21:03:07 +0100
Arnd Bergmann <arnd@...db.de> wrote:

> The pm8xxx_xoadc_probe() function triggers a bogus warning
> about an uninitialized variable:
> 
> drivers/iio/adc/qcom-pm8xxx-xoadc.c: In function 'pm8xxx_xoadc_probe':
> drivers/iio/adc/qcom-pm8xxx-xoadc.c:633:8: error: 'ch' may be used uninitialized in this function [-Werror=maybe-uninitialized]
> 
> Reword the function so the compiler can see more easily that it
> is always initialized.
> 
> Fixes: 63c3ecd946d4 ("iio: adc: add a driver for Qualcomm PM8xxx HK/XOADC")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
Thanks.

For anyone seeing this here, Linus also picked up on it and
applied a similar fix, so no need for this one.

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/iio?id=e0f0ae838a25464179d37f355d763f9ec139fc15

Thanks,

Jonathan

> ---
>  drivers/iio/adc/qcom-pm8xxx-xoadc.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/iio/adc/qcom-pm8xxx-xoadc.c b/drivers/iio/adc/qcom-pm8xxx-xoadc.c
> index c30c002f1fef..7939238001c8 100644
> --- a/drivers/iio/adc/qcom-pm8xxx-xoadc.c
> +++ b/drivers/iio/adc/qcom-pm8xxx-xoadc.c
> @@ -423,7 +423,7 @@ static irqreturn_t pm8xxx_eoc_irq(int irq, void *d)
>  static struct pm8xxx_chan_info *
>  pm8xxx_get_channel(struct pm8xxx_xoadc *adc, u8 chan)
>  {
> -	struct pm8xxx_chan_info *ch;
> +	struct pm8xxx_chan_info *ch = NULL;
>  	int i;
>  
>  	for (i = 0; i < adc->nchans; i++) {
> @@ -431,8 +431,6 @@ pm8xxx_get_channel(struct pm8xxx_xoadc *adc, u8 chan)
>  		if (ch->hwchan->amux_channel == chan)
>  			break;
>  	}
> -	if (i == adc->nchans)
> -		return NULL;
>  
>  	return ch;
>  }