linux-kernel - Re: [REGRESSION] Bluetooth adapter provided by `btusb` not recognized since v6.13.2

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Message-ID: <T4YKnjuw-ZdA4uQjGVxQh-vqahAK_69kn20zfC_8R45iOxbdjo_tlIDwP5rTUyjn3NVUHYhG09VO2ryFtfLtgptBBhfXggFNAD2CVAwPcjU=@proton.me>
Date: Wed, 19 Nov 2025 08:05:08 +0000
From: incogcyberpunk@...ton.me
To: Doug Anderson <dianders@...omium.org>
Cc: Thorsten Leemhuis <regressions@...mhuis.info>, "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>, "marcel@...tmann.org" <marcel@...tmann.org>, "luiz.dentz@...il.com" <luiz.dentz@...il.com>, "linux-bluetooth@...r.kernel.org" <linux-bluetooth@...r.kernel.org>, "johan.hedberg@...il.com" <johan.hedberg@...il.com>, "sean.wang@...iatek.com" <sean.wang@...iatek.com>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [REGRESSION] Bluetooth adapter provided by `btusb` not recognized since v6.13.2

I can confirm that reverting the commit `Bluetooth: btusb: mediatek: Add locks for usb_driver_claim_interface()` with the following commit details , solves this regression that has been present in both the stable and the mainline kernels since 6.13.2

Commit Details:
- Title: Bluetooth: btusb: mediatek: Add locks for usb_driver_claim_interface()
- commit id: 4194766ec8756f4f654d595ae49962acbac49490
- [ Upstream commit e9087e828827e5a5c85e124ce77503f2b81c3491 ]
- Author: Douglas Anderson <dianders@...omium.org>
- Date:   Wed Jan 15 19:36:36 2025 -0800

Reverting the above mentioned commit and building the latest mainline kernel without the trouble-causing commit fixes the issue and the bluetooth adapter now is properly recognized and bluetooth works flawlessly.