Re: [PATCH] clk: at91: generated: consider range when calculating best rate

[Stephen Boyd <sboyd@kernel.org>]

Quoting Codrin Ciubotariu (2022-04-13 00:13:18)
> clk_generated_best_diff() helps in finding the parent and the divisor to
> compute a rate closest to the required one. However, it doesn't take into
> account the request's range for the new rate. Make sure the new rate
> is within the required range.
> 
> Fixes: 8a8f4bf0c480 ("clk: at91: clk-generated: create function to find best_diff")
> Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
> ---

Is this fixing anything real or it's just a thing that you noticed and
sent a patch to fix?

>  drivers/clk/at91/clk-generated.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/clk/at91/clk-generated.c b/drivers/clk/at91/clk-generated.c
> index 23cc8297ec4c..d429ba52a719 100644
> --- a/drivers/clk/at91/clk-generated.c
> +++ b/drivers/clk/at91/clk-generated.c
> @@ -117,6 +117,10 @@ static void clk_generated_best_diff(struct clk_rate_request *req,
>                 tmp_rate = parent_rate;
>         else
>                 tmp_rate = parent_rate / div;
> +
> +       if (tmp_rate < req->min_rate || tmp_rate > req->max_rate)
> +               return;
> +
>         tmp_diff = abs(req->rate - tmp_rate);
>  
>         if (*best_diff < 0 || *best_diff >= tmp_diff) {