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block: warn when putting the final reference on a registered disk

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Warn when the last reference on a live disk is put without calling
del_gendisk first.  There are some BDI related bug reports that look
like a case of this, so make sure we have the proper instrumentation
to catch it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20211014130231.1468538-1-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2021-10-14 15:02:31 +02:00 committed by Jens Axboe
parent f7bf358624
commit a20417611b
1 changed files with 1 additions and 0 deletions
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block/genhd.c
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@ -1078,6 +1078,7 @@ static void disk_release(struct device *dev)
struct gendisk *disk = dev_to_disk(dev);
might_sleep();
WARN_ON_ONCE(disk_live(disk));
disk_release_events(disk);
kfree(disk->random);