Re: [PATCH 2/2] pwm: meson: add check for error from clk_round_rate()
From: Uwe Kleine-König
Date: Wed Apr 24 2024 - 03:13:48 EST
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@xxxxxxxxxxxxxxxxx>
> Signed-off-by: Dmitry Rokosov <ddrokosov@xxxxxxxxxxxxxxxxx>
> ---
> 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 |
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