[PATCH] hwrng: meson - Improve error handling for core clock

[Neil Armstrong]

On 14/09/2021 16:24, Uwe Kleine-König wrote:
> -ENOENT (ie. "there is no clock") is fine to ignore for an optional
> clock, other values are not supposed to be ignored and should be
> escalated to the caller (e.g. -EPROBE_DEFER). Ignore -ENOENT by using
> devm_clk_get_optional().
> 
> While touching this code also add an error message for the fatal errors.
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig at pengutronix.de>
> ---
>  drivers/char/hw_random/meson-rng.c | 12 +++++++++---
>  1 file changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/char/hw_random/meson-rng.c b/drivers/char/hw_random/meson-rng.c
> index e446236e81f2..9f3e2eb8011d 100644
> --- a/drivers/char/hw_random/meson-rng.c
> +++ b/drivers/char/hw_random/meson-rng.c
> @@ -54,9 +54,15 @@ static int meson_rng_probe(struct platform_device *pdev)
>  	if (IS_ERR(data->base))
>  		return PTR_ERR(data->base);
>  
> -	data->core_clk = devm_clk_get(dev, "core");
> -	if (IS_ERR(data->core_clk))
> -		data->core_clk = NULL;
> +	data->core_clk = devm_clk_get_optional(dev, "core");
> +	if (IS_ERR(data->core_clk)) {
> +		ret = PTR_ERR(data->core_clk);
> +		if (ret != -EPROBE_DEFER)
> +			dev_err(dev, "Failed to get core clock: %pe\n",
> +				data->core_clk);
> +
> +		return ret;
> +	}
>  
>  	if (data->core_clk) {
>  		ret = clk_prepare_enable(data->core_clk);
> 

Reviewed-by: Neil Armstrong <narmstrong at baylibre.com>

Thanks,
Neil