linux-kernel - Re: [PATCH 2/2] pwm: meson: add check for error from clk_round

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Message-ID: <egrt5wtiulo7ovnxkgyxaaopyfbwsnmy6ire26vukj6kyaiuki@gkzflkoxmjwb>
Date: Wed, 24 Apr 2024 09:13:23 +0200
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: George Stark <gnstark@...utedevices.com>
Cc: neil.armstrong@...aro.org, khilman@...libre.com, jbrunet@...libre.com, 
	martin.blumenstingl@...glemail.com, thierry.reding@...il.com, hkallweit1@...il.com, 
	linux-pwm@...r.kernel.org, linux-amlogic@...ts.infradead.org, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, kernel@...utedevices.com, 
	Dmitry Rokosov <ddrokosov@...utedevices.com>
Subject: Re: [PATCH 2/2] pwm: meson: add check for error from clk_round_rate()

Hello,

On Tue, Apr 23, 2024 at 07:13:56PM +0300, George Stark wrote:
> clk_round_rate() can return not only zero if requested frequency can not
> be provided but also negative error code so add check for it too.
> 
> Fixes: 329db102a26d ("pwm: meson: make full use of common clock framework")
> Signed-off-by: George Stark <gnstark@...utedevices.com>
> Signed-off-by: Dmitry Rokosov <ddrokosov@...utedevices.com>
> ---
>  drivers/pwm/pwm-meson.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c
> index ebe76298f6e2..52604635b31e 100644
> --- a/drivers/pwm/pwm-meson.c
> +++ b/drivers/pwm/pwm-meson.c
> @@ -168,9 +168,10 @@ static int meson_pwm_calc(struct pwm_chip *chip, struct pwm_device *pwm,
>  		freq = ULONG_MAX;
>  
>  	fin_freq = clk_round_rate(channel->clk, freq);
> -	if (fin_freq == 0) {
> -		dev_err(pwmchip_parent(chip), "invalid source clock frequency\n");
> -		return -EINVAL;
> +	if (fin_freq <= 0) {

fin_freq is an unsigned long, so your change doesn't have the intended
effect.

Best regards
Uwe

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

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