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floppy: Cleanup disk->queue before caling put_disk() if add_disk() was never called

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add_disk() takes gendisk reference on request queue. If driver failed during
initialization and never called add_disk() then that extra reference is not
taken. That reference is put in put_disk(). floppy driver allocates the
disk, allocates queue, sets disk->queue and then relizes that floppy
controller is not present. It tries to tear down everything and tries to
put a reference down in put_disk() which was never taken.

In such error cases cleanup disk->queue before calling put_disk() so that
we never try to put down a reference which was never taken in first place.

Reported-and-tested-by: Suresh Jayaraman <sjayaraman@suse.com>
Tested-by: Dirk Gouders <gouders@et.bocholt.fh-gelsenkirchen.de>
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Vivek Goyal 2012-02-08 20:03:38 +01:00 committed by Jens Axboe
parent cdccaa9467
commit 3f9a5aabd0
1 changed files with 7 additions and 1 deletions
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8
drivers/block/floppy.c
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@ -4368,8 +4368,14 @@ static int __init floppy_init(void)
out_put_disk:
while (dr--) {
del_timer_sync(&motor_off_timer[dr]);
if (disks[dr]->queue)
if (disks[dr]->queue) {
blk_cleanup_queue(disks[dr]->queue);
/*
* put_disk() is not paired with add_disk() and
* will put queue reference one extra time. fix it.
*/
disks[dr]->queue = NULL;
}
put_disk(disks[dr]);
}
return err;