Re: [PATCH] cpufreq/amd-pstate: Fix the return value of amd_pstate_fast_switch()

[Wyes Karny]

On 23 Nov 13:57, Gautham R. Shenoy wrote:
> cpufreq_driver->fast_switch() callback expects a frequency as a return
> value. amd_pstate_fast_switch() was returning the return value of
> amd_pstate_update_freq(), which only indicates a success or failure.
> 
> Fix this by making amd_pstate_fast_switch() return the target_freq
> when the call to amd_pstate_update_freq() is successful, and return
> the current frequency from policy->cur when the call to
> amd_pstate_update_freq() is unsuccessful.
> 
> Fixes: 4badf2eb1e98 ("cpufreq: amd-pstate: Add ->fast_switch() callback")

Reviewed-by: Wyes Karny <wyes.karny@xxxxxxx>

> Signed-off-by: Gautham R. Shenoy <gautham.shenoy@xxxxxxx>
> ---
>  drivers/cpufreq/amd-pstate.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
> index 9a1e194d5cf8..300f81d36291 100644
> --- a/drivers/cpufreq/amd-pstate.c
> +++ b/drivers/cpufreq/amd-pstate.c
> @@ -518,7 +518,9 @@ static int amd_pstate_target(struct cpufreq_policy *policy,
>  static unsigned int amd_pstate_fast_switch(struct cpufreq_policy *policy,
>  				  unsigned int target_freq)
>  {
> -	return amd_pstate_update_freq(policy, target_freq, true);
> +	if (!amd_pstate_update_freq(policy, target_freq, true))
> +		return target_freq;
> +	return policy->cur;
>  }
>  
>  static void amd_pstate_adjust_perf(unsigned int cpu,
> -- 
> 2.25.1
>