linux-kernel - Regression: devcoredump patch broke Realtek usb bluetooth adapter

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Message-ID: <20231003182038.k57nirtt4sonvt7c@box.shutemov.name>
Date:   Tue, 3 Oct 2023 21:20:38 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Hilda Wu <hildawu@...ltek.com>
Cc:     Alex Lu <alex_lu@...lsil.com.cn>,
        Luiz Augusto von Dentz <luiz.von.dentz@...el.com>,
        Max Chou <max.chou@...ltek.com>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        linux-bluetooth@...r.kernel.org,
        Thorsten Leemhuis <linux@...mhuis.info>,
        regressions@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Regression: devcoredump patch broke Realtek usb bluetooth adapter

Hi,

Commit 044014ce85a1 ("Bluetooth: btrtl: Add Realtek devcoredump support")
broke Realtek-based ASUS USB-BT500, ID 0b05:190e.

Devices failed to connect. hciconfig showed a controller with all-zero BD
address.

I reverted the commit as well as bd003fb338af that depends on the commit.
It made the problem go away.

I know virtually nothing about bluetooth. Let me know what info you need
to debug the issue.

-- 
  Kiryl Shutsemau / Kirill A. Shutemov