linux-kernel - Re: [PATCH] drm/amd/pm: clean up redundant comparisons with 0

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Date:   Tue, 7 Nov 2023 06:08:42 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     José Pekkarinen <jose.pekkarinen@...hound.fi>,
        evan.quan@....com, alexander.deucher@....com,
        christian.koenig@....com, Xinhui.Pan@....com,
        skhan@...uxfoundation.org
Cc:     airlied@...il.com, daniel@...ll.ch, jdelvare@...e.com,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
        linux-kernel-mentees@...ts.linux.dev
Subject: Re: [PATCH] drm/amd/pm: clean up redundant comparisons with 0

On 11/7/23 00:29, José Pekkarinen wrote:
> There is a couple of function return checks of functions that return
> unsigned values, and local variables to hold them are also unsigned, so
> checking if they are negative will always return false. This patch will
> remove them, as well as the never reached code.
> 
> drivers/gpu/drm/amd/pm/amdgpu_pm.c:2801:5-8: WARNING: Unsigned expression compared with zero: val < 0
> drivers/gpu/drm/amd/pm/amdgpu_pm.c:2814:5-8: WARNING: Unsigned expression compared with zero: val < 0
> 
> Signed-off-by: José Pekkarinen <jose.pekkarinen@...hound.fi>
> ---
>   drivers/gpu/drm/amd/pm/amdgpu_pm.c | 4 ----
>   1 file changed, 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/pm/amdgpu_pm.c b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
> index 8bb2da13826f..e7bb1d324084 100644
> --- a/drivers/gpu/drm/amd/pm/amdgpu_pm.c
> +++ b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
> @@ -2798,8 +2798,6 @@ static ssize_t amdgpu_hwmon_show_power_avg(struct device *dev,
>   	unsigned int val;
>   
>   	val = amdgpu_hwmon_get_power(dev, AMDGPU_PP_SENSOR_GPU_AVG_POWER);
> -	if (val < 0)
> -		return val;
>   

This is reporting errors returned from amdgpu_hwmon_get_power() as large integers.

Guenter

>   	return sysfs_emit(buf, "%u\n", val);
>   }
> @@ -2811,8 +2809,6 @@ static ssize_t amdgpu_hwmon_show_power_input(struct device *dev,
>   	unsigned int val;
>   
>   	val = amdgpu_hwmon_get_power(dev, AMDGPU_PP_SENSOR_GPU_INPUT_POWER);
> -	if (val < 0)
> -		return val;
>   
>   	return sysfs_emit(buf, "%u\n", val);
>   }