linux-kernel - Re: [PATCH v4] cpufreq: amd-pstate: fix the memory to free after epp exist

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Date: Thu, 16 May 2024 02:47:05 -0500
From: "Limonciello, Mario" <mario.limonciello@....com>
To: zhida312@...look.com, rafael@...nel.org, viresh.kumar@...aro.org
Cc: Peng Ma <andypma@...cent.com>, Huang Rui <ray.huang@....com>,
 "Gautham R. Shenoy" <gautham.shenoy@....com>, Perry Yuan
 <perry.yuan@....com>, linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] cpufreq: amd-pstate: fix the memory to free after epp
 exist

On 5/16/2024 1:30 AM, zhida312@...look.com wrote:
> From: andypma <andypma.tencent.com>
> 
> the cpudata memory from kzmalloc in epp init function is
> not free after epp exist, so we should free it.
> 
> Signed-off-by: Peng Ma <andypma@...cent.com>
> 
> Changes from v3 to v4:
> 	update subject used git command "git format-patch -1 -v x"
> 
> Changes from v2 to v3:
> 	update Signed-off-by to Peng Ma <andypma@...cent.com>.
> 	set a space between if and "(".
> 
> Changes from v1 to v2:
> 	check whether it is empty before releasing
> 	set driver_data is NULL after free
> ---

Thanks for your submission!

I would prefer the change list below the cut list, but otherwise this is 
fine.  Maybe Rafael can modify that while committing.

Acked-by: Mario Limonciello <mario.limonciello@....com>

>   drivers/cpufreq/amd-pstate.c | 7 +++++++
>   1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
> index 6a342b0c0140..1b7e82a0ad2e 100644
> --- a/drivers/cpufreq/amd-pstate.c
> +++ b/drivers/cpufreq/amd-pstate.c
> @@ -1441,6 +1441,13 @@ static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy)
>   
>   static int amd_pstate_epp_cpu_exit(struct cpufreq_policy *policy)
>   {
> +	struct amd_cpudata *cpudata = policy->driver_data;
> +
> +	if (cpudata) {
> +		kfree(cpudata);
> +		policy->driver_data = NULL;
> +	}
> +
>   	pr_debug("CPU %d exiting\n", policy->cpu);
>   	return 0;
>   }