Trying to switch to a non-existing elevator currently results in garbled dmesg output, e.g.: # echo "foo" > /sys/block/sda/queue/scheduler elevator: type foo not found elevator: switch to foo failed (note the unintended line break.) Fix by stripping the trailing newline. diff --git a/block/elevator.c b/block/elevator.c index bf11e70f008b..4f13fcd3c626 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -1112,6 +1112,7 @@ static inline bool elv_support_iosched(struct request_queue *q) ssize_t elv_iosched_store(struct request_queue *q, const char *name, size_t count) { + char elevator_name[ELV_NAME_MAX]; int ret; if (!(q->mq_ops || q->request_fn) || !elv_support_iosched(q)) @@ -1121,7 +1122,9 @@ ssize_t elv_iosched_store(struct request_queue *q, const char *name, if (!ret) return count; - printk(KERN_ERR "elevator: switch to %s failed\n", name); + strlcpy(elevator_name, name, sizeof(elevator_name)); + strstrip(elevator_name); + printk(KERN_ERR "elevator: switch to %s failed\n", elevator_name); return ret; } -- Markus