Re: [REGRESSION] btusb: ASUS USB-BT540/BT600 IDs backported without, RTL8761CUV support, adapter re-enumerates endlessly (6.18.50, 6.12.109,, 6.1.188, 5.15.221, 5.10.270)

[Sasha Levin <sashal@kernel.org>]

> Both set BTUSB_REALTEK for 0b05:1bef / 0b05:1d70, so the adapters now go
> through btrtl setup. btrtl only learned about this chip in v6.19-rc1:
>
>    4a23ce935f74 ("Bluetooth: btrtl: Add the support for RTL8761CUV")

Thanks for the detailed report, this is a good catch.

4a23ce935f74 ("Bluetooth: btrtl: Add the support for RTL8761CUV") is queued
for 6.18 and 6.12, which closes it on those two.

It cannot go to 6.6, 6.1, 5.15 or 5.10: btrtl there has no .hw_info field,
IC_INFO() still takes four arguments, and CHIP_ID_8922A, CHIP_ID_8852BT and
hci_set_quirk() are all absent, so it does not build. Those four trees get
980084de4d9b ("Bluetooth: btusb: Add ASUS USB-BT540 for Realtek 8761CU") and
6f0624b4427e ("Bluetooth: btusb: Add ASUS USB-BT600 for Realtek 8761CU")
reverted instead, which puts the adapters back on the generic path they were on
before.

-- 
Thanks,
Sasha