1 --- a/drivers/cbus/retu.c
2 +++ b/drivers/cbus/retu.c
3 @@ -120,7 +120,9 @@ void retu_write_reg(struct device *child
5 struct retu *retu = dev_get_drvdata(child->parent);
7 + mutex_lock(&retu->mutex);
8 __retu_write_reg(retu, reg, val);
9 + mutex_unlock(&retu->mutex);
11 EXPORT_SYMBOL_GPL(retu_write_reg);