linux-kernel - Re: [PATCH] drm/amd/pm: set min,max to 0 if there is no get_dpm_ultimate

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Date:   Mon, 24 Jan 2022 19:52:49 +0530
From:   "Lazar, Lijo" <lijo.lazar@....com>
To:     trix@...hat.com, evan.quan@....com, alexander.deucher@....com,
        christian.koenig@....com, Xinhui.Pan@....com, airlied@...ux.ie,
        daniel@...ll.ch, nathan@...nel.org, ndesaulniers@...gle.com,
        darren.powell@....com, guchun.chen@....com,
        Arunpravin.PaneerSelvam@....com, andrey.grodzovsky@....com
Cc:     amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] drm/amd/pm: set min,max to 0 if there is no
 get_dpm_ultimate_freq function



On 1/24/2022 7:22 PM, trix@...hat.com wrote:
> From: Tom Rix <trix@...hat.com>
> 
> clang static analysis reports this represenative problem
> amdgpu_smu.c:144:18: warning: The left operand of '*' is a garbage value
>          return clk_freq * 100;
>                 ~~~~~~~~ ^
> 
> If there is no get_dpm_ultimate_freq function,
> smu_get_dpm_freq_range returns success without setting the
> output min,max parameters.  Because this is an extern function,
> set the min,max to 0 when there is no get_dpm_ultimate_freq.
> 
> Fixes: e5ef784b1e17 ("drm/amd/powerplay: revise calling chain on retrieving frequency range")
> Signed-off-by: Tom Rix <trix@...hat.com>
> ---
>   drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c | 8 +++++++-
>   1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
> index 5ace30434e603..35fbe51f52eaa 100644
> --- a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
> +++ b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
> @@ -121,11 +121,17 @@ int smu_get_dpm_freq_range(struct smu_context *smu,
>   	if (!min && !max)
>   		return -EINVAL;
>   
> -	if (smu->ppt_funcs->get_dpm_ultimate_freq)
> +	if (smu->ppt_funcs->get_dpm_ultimate_freq) {
>   		ret = smu->ppt_funcs->get_dpm_ultimate_freq(smu,
>   							    clk_type,
>   							    min,
>   							    max);
> +	} else {

return -ENOTSUPP; would be more appropriate.

Thanks,
Lijo

> +		if (min)
> +			*min = 0;
> +		if (max)
> +			*max = 0;
> +	}
>   
>   	return ret;
>   }
>