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

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>

diff --git a/block/genhd.c b/block/genhd.c
index 7a766cc..b498585 100644 (file)
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -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);