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genhd: Fix leaked module reference for NVME devices 

Commit 8ddcd65325 "block: introduce GENHD_FL_HIDDEN" added handling of
hidden devices to get_gendisk() but forgot to drop module reference
which is also acquired by get_disk(). Drop the reference as necessary.

Arguably the function naming here is misleading as put_disk() is *not*
the counterpart of get_disk() but let's fix that in the follow up
commit since that will be more intrusive.

Fixes: 8ddcd65325
CC: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
hifive-unleashed-5.1
Jan Kara 2018-02-26 13:01:37 +01:00 committed by Jens Axboe
parent d9c10e5b88
commit d52987b524
1 changed files with 3 additions and 0 deletions
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3
block/genhd.c
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@ -817,7 +817,10 @@ struct gendisk *get_gendisk(dev_t devt, int *partno)
}
if (disk && unlikely(disk->flags & GENHD_FL_HIDDEN)) {
struct module *owner = disk->fops->owner;
put_disk(disk);
module_put(owner);
disk = NULL;
}
return disk;