Re: [PATCH 10/12] cpufreq/amd-pstate: Add missing NULL ptr check in amd_pstate_update

[Gautham R. Shenoy]

On Wed, Feb 05, 2025 at 11:25:21AM +0000, Dhananjay Ugwekar wrote:
> Check if policy is NULL before dereferencing it in amd_pstate_update.

Reviewed-by: Gautham R. Shenoy <gautham.shenoy@xxxxxxx>

-- 
Thanks and Regards
gautham.


> 
> Fixes: e8f555daacd3 ("cpufreq/amd-pstate: fix setting policy current frequency value")
> Signed-off-by: Dhananjay Ugwekar <dhananjay.ugwekar@xxxxxxx>
> ---
>  drivers/cpufreq/amd-pstate.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
> index 9c939be59042..6a604f0797d9 100644
> --- a/drivers/cpufreq/amd-pstate.c
> +++ b/drivers/cpufreq/amd-pstate.c
> @@ -551,6 +551,9 @@ static void amd_pstate_update(struct amd_cpudata *cpudata, u8 min_perf,
>  	struct cpufreq_policy *policy = cpufreq_cpu_get(cpudata->cpu);
>  	u8 nominal_perf = READ_ONCE(cpudata->nominal_perf);
>  
> +	if (!policy)
> +		return;
> +
>  	des_perf = clamp_t(u8, des_perf, min_perf, max_perf);
>  
>  	policy->cur = perf_to_freq(cpudata, des_perf);
> -- 
> 2.34.1
>