drm/nouveau: fix temp/pwm visibility, skip hwmon when no sensors exist

A NV34 GPU was seeing temp and pwm entries in hwmon, which would error
out when read. These should not have been visible, but also the whole
hwmon object should just not have been registered in the first place.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nouveau_hwmon.c b/drivers/gpu/drm/nouveau/nouveau_hwmon.c
index 7c965648df8049133b5da93dd21be6f6f11e6e8f..44178b4c359980d171332c19226d044de1817534 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_hwmon.c
+++ b/drivers/gpu/drm/nouveau/nouveau_hwmon.c
@@ -327,7 +327,7 @@ nouveau_temp_is_visible(const void *data, u32 attr, int channel)
        struct nouveau_drm *drm = nouveau_drm((struct drm_device *)data);
        struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
 
-       if (therm && therm->attr_get && nvkm_therm_temp_get(therm) < 0)
+       if (!therm || !therm->attr_get || nvkm_therm_temp_get(therm) < 0)
                return 0;
 
        switch (attr) {
@@ -351,8 +351,8 @@ nouveau_pwm_is_visible(const void *data, u32 attr, int channel)
        struct nouveau_drm *drm = nouveau_drm((struct drm_device *)data);
        struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
 
-       if (therm && therm->attr_get && therm->fan_get &&
-                               therm->fan_get(therm) < 0)
+       if (!therm || !therm->attr_get || !therm->fan_get ||
+           therm->fan_get(therm) < 0)
                return 0;
 
        switch (attr) {
@@ -707,13 +707,20 @@ nouveau_hwmon_init(struct drm_device *dev)
 {
 #if defined(CONFIG_HWMON) || (defined(MODULE) && defined(CONFIG_HWMON_MODULE))
        struct nouveau_drm *drm = nouveau_drm(dev);
+       struct nvkm_iccsense *iccsense = nvxx_iccsense(&drm->client.device);
        struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
+       struct nvkm_volt *volt = nvxx_volt(&drm->client.device);
        const struct attribute_group *special_groups[N_ATTR_GROUPS];
        struct nouveau_hwmon *hwmon;
        struct device *hwmon_dev;
        int ret = 0;
        int i = 0;
 
+       if (!iccsense && !therm && !volt) {
+               NV_DEBUG(drm, "Skipping hwmon registration\n");
+               return 0;
+       }
+
        hwmon = drm->hwmon = kzalloc(sizeof(*hwmon), GFP_KERNEL);
        if (!hwmon)
                return -ENOMEM;
@@ -749,6 +756,9 @@ nouveau_hwmon_fini(struct drm_device *dev)
 #if defined(CONFIG_HWMON) || (defined(MODULE) && defined(CONFIG_HWMON_MODULE))
        struct nouveau_hwmon *hwmon = nouveau_hwmon(dev);
 
+       if (!hwmon)
+               return;
+
        if (hwmon->hwmon)
                hwmon_device_unregister(hwmon->hwmon);