PM / devfreq: mediatek: unlock on error in mtk_ccifreq_target()

Call mutex_unlock(&drv->reg_lock) before returning the error code.

Link: https://lore.kernel.org/all/[email protected]/
Fixes: d280560 ("PM / devfreq: mediatek: protect oop in critical session")
Signed-off-by: Dan Carpenter <[email protected]>
Reviewed-by: AngeloGioacchino Del Regno <[email protected]>
Signed-off-by: Chanwoo Choi <[email protected]>

Author: Dan Carpenter

drivers/devfreq/mtk-cci-devfreq.c

@@ -146,7 +146,8 @@ static int mtk_ccifreq_target(struct device *dev, unsigned long *freq,
 	opp = devfreq_recommended_opp(dev, &opp_rate, 1);
 	if (IS_ERR(opp)) {
 		dev_err(dev, "failed to find opp for freq: %ld\n", opp_rate);
-		return PTR_ERR(opp);
+		ret = PTR_ERR(opp);
+		goto out_unlock;
 	}
 
 	voltage = dev_pm_opp_get_voltage(opp);