block: don't send uevent for empty disk when not invalidating
Commit 6917d068 ("block: merge invalidate_partitions into rescan_partitions") caused a regression where systemd-udevd spins forever using max CPU starting at boot time. It's caused by a behavior change where a KOBJ_CHANGE uevent is now sent in a case where previously it wasn't. Restore the old behavior. Fixes: 6917d068 ("block: merge invalidate_partitions into rescan_partitions") Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NEric Biggers <ebiggers@google.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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