md: Unify mddev destruction paths
Previously, mddev_put() had a couple different paths for freeing a mddev, due to the fact that the kobject wasn't initialized when the mddev was first allocated. If we move the kobject_init() to when it's first allocated and just use kobject_add() later, we can clean all this up. This also removes a hack in mddev_put() to avoid freeing biosets under a spinlock, which involved copying biosets on the stack after the reset bioset_init() changes. Signed-off-by: NKent Overstreet <kent.overstreet@gmail.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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