[Nouveau] [RFC PATCH 02/29] hwmon: properly check for errors

[Pierre Moreau]

Reviewed-by: Pierre Moreau <pierre.morrow at free.fr>

On 2017-09-15 — 17:11, Karol Herbst wrote:
> Otherwise hwmon interprets error codes as real values.
> 
> Signed-off-by: Karol Herbst <karolherbst at gmail.com>
> ---
>  drm/nouveau/nouveau_hwmon.c | 33 ++++++++++++++++++++++++++-------
>  1 file changed, 26 insertions(+), 7 deletions(-)
> 
> diff --git a/drm/nouveau/nouveau_hwmon.c b/drm/nouveau/nouveau_hwmon.c
> index f1914d9a..0d75c14d 100644
> --- a/drm/nouveau/nouveau_hwmon.c
> +++ b/drm/nouveau/nouveau_hwmon.c
> @@ -470,18 +470,23 @@ nouveau_fan_read(struct device *dev, u32 attr, int channel, long *val)
>  	struct drm_device *drm_dev = dev_get_drvdata(dev);
>  	struct nouveau_drm *drm = nouveau_drm(drm_dev);
>  	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
> +	int ret;
>  
>  	if (!therm)
>  		return -EOPNOTSUPP;
>  
>  	switch (attr) {
>  	case hwmon_fan_input:
> -		*val = nvkm_therm_fan_sense(therm);
> +		ret = nvkm_therm_fan_sense(therm);
>  		break;
>  	default:
>  		return -EOPNOTSUPP;
>  	}
>  
> +	if (ret < 0)
> +		return ret;
> +
> +	*val = ret;
>  	return 0;
>  }
>  
> @@ -491,7 +496,7 @@ nouveau_in_read(struct device *dev, u32 attr, int channel, long *val)
>  	struct drm_device *drm_dev = dev_get_drvdata(dev);
>  	struct nouveau_drm *drm = nouveau_drm(drm_dev);
>  	struct nvkm_volt *volt = nvxx_volt(&drm->client.device);
> -	int ret;
> +	int ret = 0;
>  
>  	if (!volt)
>  		return -EOPNOTSUPP;
> @@ -499,7 +504,8 @@ nouveau_in_read(struct device *dev, u32 attr, int channel, long *val)
>  	switch (attr) {
>  	case hwmon_in_input:
>  		ret = nvkm_volt_get(volt);
> -		*val = ret < 0 ? ret : (ret / 1000);
> +		if (ret >= 0)
> +			*val = ret / 1000;
>  		break;
>  	case hwmon_in_min:
>  		*val = volt->min_uv > 0 ? (volt->min_uv / 1000) : -ENODEV;
> @@ -511,7 +517,7 @@ nouveau_in_read(struct device *dev, u32 attr, int channel, long *val)
>  		return -EOPNOTSUPP;
>  	}
>  
> -	return 0;
> +	return ret;
>  }
>  
>  static int
> @@ -520,21 +526,26 @@ nouveau_pwm_read(struct device *dev, u32 attr, int channel, long *val)
>  	struct drm_device *drm_dev = dev_get_drvdata(dev);
>  	struct nouveau_drm *drm = nouveau_drm(drm_dev);
>  	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
> +	int ret;
>  
>  	if (!therm || !therm->attr_get || !therm->fan_get)
>  		return -EOPNOTSUPP;
>  
>  	switch (attr) {
>  	case hwmon_pwm_enable:
> -		*val = therm->attr_get(therm, NVKM_THERM_ATTR_FAN_MODE);
> +		ret = therm->attr_get(therm, NVKM_THERM_ATTR_FAN_MODE);
>  		break;
>  	case hwmon_pwm_input:
> -		*val = therm->fan_get(therm);
> +		ret = therm->fan_get(therm);
>  		break;
>  	default:
>  		return -EOPNOTSUPP;
>  	}
>  
> +	if (ret < 0)
> +		return ret;
> +
> +	*val = ret;
>  	return 0;
>  }
>  
> @@ -544,18 +555,26 @@ nouveau_power_read(struct device *dev, u32 attr, int channel, long *val)
>  	struct drm_device *drm_dev = dev_get_drvdata(dev);
>  	struct nouveau_drm *drm = nouveau_drm(drm_dev);
>  	struct nvkm_iccsense *iccsense = nvxx_iccsense(&drm->client.device);
> +	int ret;
>  
>  	if (!iccsense)
>  		return -EOPNOTSUPP;
>  
>  	switch (attr) {
>  	case hwmon_power_input:
> -		*val = nvkm_iccsense_read_all(iccsense);
> +		ret = nvkm_iccsense_read_all(iccsense);
> +		if (ret < 0)
> +			return ret;
> +		*val = ret;
>  		break;
>  	case hwmon_power_max:
> +		if (iccsense->power_w_max <= 0)
> +			return -ENODEV;
>  		*val = iccsense->power_w_max;
>  		break;
>  	case hwmon_power_crit:
> +		if (iccsense->power_w_crit <= 0)
> +			return -ENODEV;
>  		*val = iccsense->power_w_crit;
>  		break;
>  	default:
> -- 
> 2.14.1
> 
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> Nouveau at lists.freedesktop.org
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