CW6622 Bluetooth Dongle doesn’t work in OpenWRT, used to work in previous openwrt release.
Looks like this is related to https://bugzilla.kernel.org/show_bug.cgi?id=98221 which has a very simple fix patch provided which apparently is fixed in the 4.9 kernel.
Patch diff is at https://bugzilla.kernel.org/attachment.cgi?id=229591&action=diff