linux-kernel - Re: 回复: [v3] cpufreq: amd-pstate: fix the memory to free after epp exist

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Date: Thu, 16 May 2024 00:36:46 -0500
From: "Limonciello, Mario" <mario.limonciello@....com>
To: Ma ZhiDa <zhida312@...look.com>, "Yuan, Perry" <Perry.Yuan@....com>
Cc: Peng Ma <andypma@...cent.com>, "Huang, Ray" <Ray.Huang@....com>,
 "Shenoy, Gautham Ranjal" <gautham.shenoy@....com>,
 "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
 "rafael@...nel.org" <rafael@...nel.org>
Subject: Re: 回复: [v3] cpufreq: amd-pstate: fix the memory to free after epp exist



On 5/15/2024 11:05 PM, Ma ZhiDa wrote:
> Hi Perry,
> 
> Got it. Thanks.
> 
> BR,
> Peng
> ------------------------------------------------------------------------
> *发件人:* Yuan, Perry <Perry.Yuan@....com>
> *发送时间:* 2024年5月16日 10:48
> *收件人:* zhida312@...look.com <zhida312@...look.com>
> *抄送:* Peng Ma <andypma@...cent.com>; Huang, Ray <Ray.Huang@....com>; 
> Shenoy, Gautham Ranjal <gautham.shenoy@....com>; Limonciello, Mario 
> <Mario.Limonciello@....com>; linux-pm@...r.kernel.org 
> <linux-pm@...r.kernel.org>; linux-kernel@...r.kernel.org 
> <linux-kernel@...r.kernel.org>; viresh.kumar@...aro.org 
> <viresh.kumar@...aro.org>; rafael@...nel.org <rafael@...nel.org>
> *主题:* RE: [v3] cpufreq: amd-pstate: fix the memory to free after epp 
> exist
> [AMD Official Use Only - AMD Internal Distribution Only]
> 
> Hi Peng,
> 
>> -----Original Message-----
>> From: zhida312@...look.com <zhida312@...look.com>
>> Sent: Wednesday, May 15, 2024 10:54 AM
>> To: rafael@...nel.org; viresh.kumar@...aro.org
>> Cc: Peng Ma <andypma@...cent.com>; Huang, Ray <Ray.Huang@....com>;
>> Shenoy, Gautham Ranjal <gautham.shenoy@....com>; Limonciello, Mario
>> <Mario.Limonciello@....com>; Yuan, Perry <Perry.Yuan@....com>; linux-
>> pm@...r.kernel.org; linux-kernel@...r.kernel.org
>> Subject: [v3] cpufreq: amd-pstate: fix the memory to free after epp exist
> 
> The subject need to be update as below. " git format-patch -1 -v 3"
> 
> [PATCH v3] cpufreq: amd-pstate: fix the memory to free after epp exist
> 
> 
>>
>> 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 since v2:
>>       update Signed-off-by to Peng Ma <andypma@...cent.com>.
>>       set a space between if and "(".
>>
>> Changes since v1:
>>       check whether it is empty before releasing.
>>       set driver_data is NULL after free.
If you submit one more change, please add your changelist below cutlist.

IE:

S-o-b <user@...e>
---
Changes from v3 to v4:
Foo the bar

>> ---
>>  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;
>>  }
>> --
>> 2.41.0
>