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[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: Nate Diller <nate@namesys.com>
Acked-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Nate Diller 2005-10-30 15:02:24 -08:00 committed by Linus Torvalds
parent 3fa63c7d82
commit 2ca7d93bb2
1 changed files with 3 additions and 1 deletions
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4
drivers/block/elevator.c
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@ -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)) {
elevator_put(e);
return count;
}
elevator_switch(q, e);
return count;