linux-kernel - Re: [PATCH] cpufreq: amd-pstate: Fix uninitialized variable in amd_pstate_cpu_boost

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Message-ID: <Zp4emEks9X5jL1x7@BLRRASHENOY1.amd.com>
Date: Mon, 22 Jul 2024 14:25:52 +0530
From: "Gautham R. Shenoy" <gautham.shenoy@....com>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: Perry Yuan <Perry.Yuan@....com>, Huang Rui <ray.huang@....com>,
	Mario Limonciello <mario.limonciello@....com>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] cpufreq: amd-pstate: Fix uninitialized variable in
 amd_pstate_cpu_boost_update()

Hello Dan,


On Thu, Jul 18, 2024 at 03:08:36PM -0500, Dan Carpenter wrote:
> Smatch complains that "ret" could be uninitialized:
> 
>   drivers/cpufreq/amd-pstate.c:734 amd_pstate_cpu_boost_update()
>   error: uninitialized symbol 'ret'.
> 
> This seems like it probably is a real issue.  Initialize "ret" to zero to
> be safe.


Thanks for catching this. Yes, it is a real issue on MSR based
platforms when the amd-pstate driver is not in the passive mode.

> 
> Fixes: c8c68c38b56f ("cpufreq: amd-pstate: initialize core precision boost state")
> Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>

Acked-by: Gautham R. Shenoy <gautham.shenoy@....com>


> ---
>  drivers/cpufreq/amd-pstate.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
> index 68c616b572f2..358bd88cd0c5 100644
> --- a/drivers/cpufreq/amd-pstate.c
> +++ b/drivers/cpufreq/amd-pstate.c
> @@ -692,7 +692,7 @@ static int amd_pstate_cpu_boost_update(struct cpufreq_policy *policy, bool on)
>  	struct amd_cpudata *cpudata = policy->driver_data;
>  	struct cppc_perf_ctrls perf_ctrls;
>  	u32 highest_perf, nominal_perf, nominal_freq, max_freq;
> -	int ret;
> +	int ret = 0;
>  
>  	highest_perf = READ_ONCE(cpudata->highest_perf);
>  	nominal_perf = READ_ONCE(cpudata->nominal_perf);
> -- 
> 2.43.0
>