linux-kernel - Re: [PATCH v2 2/2] cpufreq/amd-pstate: Move registration after static function call update

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Message-ID: <779c6cbe-8c59-4326-8fbc-99889a13d204@amd.com>
Date: Tue, 29 Oct 2024 10:27:35 +0530
From: Dhananjay Ugwekar <Dhananjay.Ugwekar@....com>
To: Mario Limonciello <superm1@...nel.org>,
 "Gautham R . Shenoy" <gautham.shenoy@....com>,
 Perry Yuan <perry.yuan@....com>
Cc: "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
 <linux-kernel@...r.kernel.org>,
 "open list:CPU FREQUENCY SCALING FRAMEWORK" <linux-pm@...r.kernel.org>,
 Mario Limonciello <mario.limonciello@....com>,
 Klara Modin <klarasmodin@...il.com>
Subject: Re: [PATCH v2 2/2] cpufreq/amd-pstate: Move registration after static
 function call update

On 10/28/2024 8:25 PM, Mario Limonciello wrote:
> From: Mario Limonciello <mario.limonciello@....com>
> 
> On shared memory designs the static functions need to work before
> registration is done or the system can hang at bootup.
> 
> Move the registration later in amd_pstate_init() to solve this.

Looks good to me.
Also, 
Tested-by: Dhananjay Ugwekar <dhananjay.ugwekar@....com>

Thanks,
Dhananjay

> 
> Fixes: e238968a2087 ("cpufreq/amd-pstate: Remove the redundant amd_pstate_set_driver() call")
> Reported-by: Klara Modin <klarasmodin@...il.com>
> Closes: https://lore.kernel.org/linux-pm/cf9c146d-bacf-444e-92e2-15ebf513af96@gmail.com/#t
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
> ---
>  drivers/cpufreq/amd-pstate.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
> index e480da818d6f5..f834cc8205e2a 100644
> --- a/drivers/cpufreq/amd-pstate.c
> +++ b/drivers/cpufreq/amd-pstate.c
> @@ -1859,12 +1859,6 @@ static int __init amd_pstate_init(void)
>  		return -ENODEV;
>  	}
>  
> -	ret = amd_pstate_register_driver(cppc_state);
> -	if (ret) {
> -		pr_err("failed to register with return %d\n", ret);
> -		return ret;
> -	}
> -
>  	/* capability check */
>  	if (cpu_feature_enabled(X86_FEATURE_CPPC)) {
>  		pr_debug("AMD CPPC MSR based functionality is supported\n");
> @@ -1875,6 +1869,12 @@ static int __init amd_pstate_init(void)
>  		static_call_update(amd_pstate_update_perf, shmem_update_perf);
>  	}
>  
> +	ret = amd_pstate_register_driver(cppc_state);
> +	if (ret) {
> +		pr_err("failed to register with return %d\n", ret);
> +		return ret;
> +	}
> +
>  	if (amd_pstate_prefcore) {
>  		ret = amd_detect_prefcore(&amd_pstate_prefcore);
>  		if (ret)