RE: Regression: devcoredump patch broke Realtek usb bluetooth adapter

[Max Chou]

Hi! Kirill,
I based on Kernel v6.5.5 and updated drivers/bluetooth to the last version of bluetooth-next tree for a test with RTL8761BUV.
The dmesg log and "hciconfig -a" are correct.
Could you share the dmesg for your failure case?

[56133.563293] usb 3-1: new full-speed USB device number 28 using xhci_hcd
[56133.712559] usb 3-1: New USB device found, idVendor=0bda, idProduct=8771, bcdDevice= 2.00
[56133.712577] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[56133.712582] usb 3-1: Product: Bluetooth Radio
[56133.712585] usb 3-1: Manufacturer: Realtek
[56133.712588] usb 3-1: SerialNumber: 00E04C239987
[56133.737812] usbcore: registered new interface driver btusb
[56133.742126] Bluetooth: hci0: RTL: examining hci_ver=0a hci_rev=000b lmp_ver=0a lmp_subver=8761
[56133.743115] Bluetooth: hci0: RTL: rom_version status=0 version=1
[56133.743124] Bluetooth: hci0: RTL: loading rtl_bt/rtl8761bu_fw.bin
[56133.743754] Bluetooth: hci0: RTL: loading rtl_bt/rtl8761bu_config.bin
[56133.743829] Bluetooth: hci0: RTL: cfg_sz 6, total sz 30210
[56133.913311] Bluetooth: hci0: RTL: fw version 0xdfc6d922
[56133.980299] Bluetooth: MGMT ver 1.22

hci0:   Type: Primary  Bus: USB
        BD Address: 98:A2:35:85:56:F1  ACL MTU: 1021:6  SCO MTU: 255:12
        UP RUNNING
        RX bytes:1670 acl:0 sco:0 events:184 errors:0
        TX bytes:33917 acl:0 sco:0 commands:184 errors:0
        Features: 0xff 0xff 0xff 0xfe 0xdb 0xfd 0x7b 0x87
        Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
        Link policy: RSWITCH HOLD SNIFF PARK
        Link mode: PERIPHERAL ACCEPT
        Name: 'max-ThinkPad-X230'
        Class: 0x6c010c
        Service Classes: Rendering, Capturing, Audio, Telephony
        Device Class: Computer, Laptop
        HCI Version: 5.1 (0xa)  Revision: 0xdfc6
        LMP Version: 5.1 (0xa)  Subversion: 0xd922
        Manufacturer: Realtek Semiconductor Corporation (93)


BRs,
Max


> -----Original Message-----
> From: Bagas Sanjaya <bagasdotme@xxxxxxxxx>
> Sent: Wednesday, October 4, 2023 7:56 AM
> To: Kirill A. Shutemov <kirill@xxxxxxxxxxxxx>; Hilda Wu
> <hildawu@xxxxxxxxxxx>
> Cc: alex_lu@xxxxxxxxxxxxxx; Luiz Augusto von Dentz
> <luiz.von.dentz@xxxxxxxxx>; Max Chou <max.chou@xxxxxxxxxxx>; Marcel
> Holtmann <marcel@xxxxxxxxxxxx>; Johan Hedberg
> <johan.hedberg@xxxxxxxxx>; Juerg Haefliger
> <juerg.haefliger@xxxxxxxxxxxxx>; Linux Bluetooth
> <linux-bluetooth@xxxxxxxxxxxxxxx>; Thorsten Leemhuis <linux@xxxxxxxxxxxxx>;
> Linux Regressions <regressions@xxxxxxxxxxxxxxx>; Linux Kernel Mailing List
> <linux-kernel@xxxxxxxxxxxxxxx>
> Subject: Re: Regression: devcoredump patch broke Realtek usb bluetooth
> adapter
> 
> On Tue, Oct 03, 2023 at 09:20:38PM +0300, Kirill A. Shutemov wrote:
> > 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.
> 
> What is its output then? And dmesg log?
> 
> >
> > 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.
> >
> 
> Hilda, it looks like this regression is caused by a commit of yours. Would you
> like to take a look on it?
> 
> Regardless, thanks for the regression report. I'm adding it to regzbot:
> 
> #regzbot ^introduced: 044014ce85a17c
> 
> --
> An old man doll... just what I always wanted! - Clara