drm/nouveau/pm: fix oops if chipset has no pm support at all

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
git-mirror · Mar 13, 2012 · c11dd0d · c11dd0d
1 parent 4489b98
commit c11dd0d
Showing 1 changed file with 5 additions and 3 deletions.
diff --git a/drivers/gpu/drm/nouveau/nouveau_pm.c b/drivers/gpu/drm/nouveau/nouveau_pm.c
@@ -284,9 +284,11 @@ nouveau_pm_perflvl_get(struct drm_device *dev, struct nouveau_pm_level *perflvl)
 
 	memset(perflvl, 0, sizeof(*perflvl));
 
-	ret = pm->clocks_get(dev, perflvl);
-	if (ret)
-		return ret;
+	if (pm->clocks_get) {
+		ret = pm->clocks_get(dev, perflvl);
+		if (ret)
+			return ret;
+	}
 
 	if (pm->voltage.supported && pm->voltage_get) {
 		ret = pm->voltage_get(dev);