drm/nouveau/pm: avoid potential divide-by-zero

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Martin Peres <martin.peres@labri.fr>

diff --git a/drivers/gpu/drm/nouveau/nouveau_pm.c b/drivers/gpu/drm/nouveau/nouveau_pm.c
index 08c563d..6e3851e 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_pm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_pm.c
@@ -50,7 +50,7 @@ nouveau_pwmfan_get(struct drm_device *dev)
        ret = nouveau_gpio_find(dev, 0, DCB_GPIO_PWM_FAN, 0xff, &gpio);
        if (ret == 0) {
                ret = pm->pwm_get(dev, gpio.line, &divs, &duty);
-               if (ret == 0) {
+               if (ret == 0 && divs) {
                        divs = max(divs, duty);
                        if (dev_priv->card_type <= NV_40 || (gpio.log[0] & 1))
                                duty = divs - duty;