linux-kernel - Re: [PATCH] pwm: sun4i: redundant assignment to variable pval

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Message-ID: <20191002101624.gljyf7g4nia2rcbx@pengutronix.de>
Date:   Wed, 2 Oct 2019 12:16:24 +0200
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Colin King <colin.king@...onical.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>, linux-pwm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pwm: sun4i: redundant assignment to variable pval

On Wed, Oct 02, 2019 at 11:08:44AM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Variable pval is being assigned a value that is never read. The
> assignment is redundant and hence can be removed.
> 
> Addresses-Coverity: ("Unused value")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/pwm/pwm-sun4i.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/pwm/pwm-sun4i.c b/drivers/pwm/pwm-sun4i.c
> index 6f5840a1a82d..53970d4ba695 100644
> --- a/drivers/pwm/pwm-sun4i.c
> +++ b/drivers/pwm/pwm-sun4i.c
> @@ -156,7 +156,6 @@ static int sun4i_pwm_calculate(struct sun4i_pwm_chip *sun4i_pwm,
>  	if (sun4i_pwm->data->has_prescaler_bypass) {
>  		/* First, test without any prescaler when available */
>  		prescaler = PWM_PRESCAL_MASK;
> -		pval = 1;
>  		/*
>  		 * When not using any prescaler, the clock period in nanoseconds
>  		 * is not an integer so round it half up instead of

Looks fine, the issue exists since
deb9c462f4e539cc7f8389b9855eb7a507c78e7e.

You can even make pval a local variable for the second for loop.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |