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drm/nouveau/hwmon: return EINVAL if the GPU is powered down for sensors reads

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fixes bogus values userspace gets from hwmon while the GPU is powered down

Signed-off-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Rhys Kidd <rhyskidd@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Karol Herbst 2019-06-18 13:01:33 +02:00 committed by Ben Skeggs
parent b0f84a84ff
commit 68bf8b5779
1 changed files with 10 additions and 0 deletions
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10
drivers/gpu/drm/nouveau/nouveau_hwmon.c
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@ -428,6 +428,8 @@ nouveau_temp_read(struct device *dev, u32 attr, int channel, long *val)
switch (attr) {
case hwmon_temp_input:
if (drm_dev->switch_power_state != DRM_SWITCH_POWER_ON)
return -EINVAL;
ret = nvkm_therm_temp_get(therm);
*val = ret < 0 ? ret : (ret * 1000);
break;
@ -474,6 +476,8 @@ nouveau_fan_read(struct device *dev, u32 attr, int channel, long *val)
switch (attr) {
case hwmon_fan_input:
if (drm_dev->switch_power_state != DRM_SWITCH_POWER_ON)
return -EINVAL;
*val = nvkm_therm_fan_sense(therm);
break;
default:
@ -496,6 +500,8 @@ nouveau_in_read(struct device *dev, u32 attr, int channel, long *val)
switch (attr) {
case hwmon_in_input:
if (drm_dev->switch_power_state != DRM_SWITCH_POWER_ON)
return -EINVAL;
ret = nvkm_volt_get(volt);
*val = ret < 0 ? ret : (ret / 1000);
break;
@ -527,6 +533,8 @@ nouveau_pwm_read(struct device *dev, u32 attr, int channel, long *val)
*val = therm->attr_get(therm, NVKM_THERM_ATTR_FAN_MODE);
break;
case hwmon_pwm_input:
if (drm_dev->switch_power_state != DRM_SWITCH_POWER_ON)
return -EINVAL;
*val = therm->fan_get(therm);
break;
default:
@ -548,6 +556,8 @@ nouveau_power_read(struct device *dev, u32 attr, int channel, long *val)
switch (attr) {
case hwmon_power_input:
if (drm_dev->switch_power_state != DRM_SWITCH_POWER_ON)
return -EINVAL;
*val = nvkm_iccsense_read_all(iccsense);
break;
case hwmon_power_max: