Commit 2ca7d93b authored by Nate Diller's avatar Nate Diller Committed by Linus Torvalds
Browse files

[PATCH] block cleanups: Fix iosched module refcount leak

If the requested I/O scheduler is already in place, elevator_switch simply
leaves the queue alone, and returns.  However, it forgets to call
elevator_put, so

'echo [current_sched] > /sys/block/[dev]/queue/scheduler'

will leak a reference, causing the current_sched module to be permanently
pinned in memory.
Signed-off-by: default avatarNate Diller <>
Acked-by: default avatarJens Axboe <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 3fa63c7d
......@@ -753,8 +753,10 @@ ssize_t elv_iosched_store(request_queue_t *q, const char *name, size_t count)
return -EINVAL;
if (!strcmp(elevator_name, q->elevator->elevator_type->elevator_name))
if (!strcmp(elevator_name, q->elevator->elevator_type->elevator_name)) {
return count;
elevator_switch(q, e);
return count;
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