linux-kernel - Re: [PATCH] drm/amd/pm: Fix unsigned expression compared with zero

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Date:   Fri, 18 Aug 2023 12:24:25 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
Cc:     alexander.deucher@....com, linux-hwmon@...r.kernel.org,
        jdelvare@...e.com, Xinhui.Pan@....com,
        Abaci Robot <abaci@...ux.alibaba.com>,
        linux-kernel@...r.kernel.org, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, christian.koenig@....com,
        linux@...ck-us.net
Subject: Re: [PATCH] drm/amd/pm: Fix unsigned expression compared with zero

On Thu, Aug 17, 2023 at 2:07 AM Jiapeng Chong
<jiapeng.chong@...ux.alibaba.com> wrote:
>
> The val is defined as unsigned int type, if(val<0) is invalid, modify
> to int type.
>
> drivers/gpu/drm/amd/amdgpu/../pm/amdgpu_pm.c:2813 amdgpu_hwmon_show_power_input() warn: unsigned 'val' is never less than zero.
> drivers/gpu/drm/amd/amdgpu/../pm/amdgpu_pm.c:2800 amdgpu_hwmon_show_power_avg() warn: unsigned 'val' is never less than zero.
>
> Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
> Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=6181
> Signed-off-by: Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>

Thanks.  The function signatures for amdgpu_hwmon_get_power() and
amdgpu_hwmon_get_sensor_generic() should be fixed up as well.  I'll
send out a fix.

Alex

> ---
>  drivers/gpu/drm/amd/pm/amdgpu_pm.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/pm/amdgpu_pm.c b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
> index 5b1d73b00ef7..fe490e5860d2 100644
> --- a/drivers/gpu/drm/amd/pm/amdgpu_pm.c
> +++ b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
> @@ -2794,7 +2794,7 @@ static ssize_t amdgpu_hwmon_show_power_avg(struct device *dev,
>                                            struct device_attribute *attr,
>                                            char *buf)
>  {
> -       unsigned int val;
> +       int val;
>
>         val = amdgpu_hwmon_get_power(dev, AMDGPU_PP_SENSOR_GPU_AVG_POWER);
>         if (val < 0)
> @@ -2807,7 +2807,7 @@ static ssize_t amdgpu_hwmon_show_power_input(struct device *dev,
>                                              struct device_attribute *attr,
>                                              char *buf)
>  {
> -       unsigned int val;
> +       int val;
>
>         val = amdgpu_hwmon_get_power(dev, AMDGPU_PP_SENSOR_GPU_INPUT_POWER);
>         if (val < 0)
> --
> 2.20.1.7.g153144c
>