linux-kernel - Re: [PATCH] cpufreq: Fix policy->freq_table is NULL in __cpufreq_driver

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Date:   Tue, 04 Apr 2023 03:08:30 +0000
From:   "Yajun Deng" <yajun.deng@...ux.dev>
To:     "Viresh Kumar" <viresh.kumar@...aro.org>
Cc:     rafael@...nel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpufreq: Fix policy->freq_table is NULL in
 __cpufreq_driver_target()

April 3, 2023 12:11 PM, "Viresh Kumar" <viresh.kumar@...aro.org> wrote:

> On 29-03-23, 21:36, Yajun Deng wrote:
> 
>> __resolve_freq() may be return target_freq if policy->freq_table is
>> NULL. In this case, it should return -EINVAL before __target_index().
>> 
>> Signed-off-by: Yajun Deng <yajun.deng@...ux.dev>
>> ---
>> drivers/cpufreq/cpufreq.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>> 
>> diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
>> index c0e5be0fe2d6..308a3df1a940 100644
>> --- a/drivers/cpufreq/cpufreq.c
>> +++ b/drivers/cpufreq/cpufreq.c
>> @@ -2299,7 +2299,7 @@ int __cpufreq_driver_target(struct cpufreq_policy *policy,
>> return cpufreq_driver->target(policy, target_freq, relation);
>> }
>> 
>> - if (!cpufreq_driver->target_index)
>> + if (!cpufreq_driver->target_index || !policy->freq_table)
>> return -EINVAL;
> 
> Hi,
> 
> I have sent an alternate patch [1] for this, please try it.
>
 
Thanks, v2 is fine.

> --
> viresh
> 
> [1]
> https://lore.kernel.org/all/53d4ed4e5b18a59a48790434f8146fb207e11c49.1680494945.git.viresh.kumar@lin
> ro.org