[PATCH 1/6] genhd: Fix leaked module reference for NVME devices

[Jan Kara]

Commit 8ddcd653257c "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: 8ddcd653257c18a669fcb75ee42c37054908e0d6
CC: Christoph Hellwig <h...@lst.de>
Signed-off-by: Jan Kara <j...@suse.cz>
---
 block/genhd.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/block/genhd.c b/block/genhd.c
index 88a53c188cb7..5098bffe6ba6 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -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;
-- 
2.13.6