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

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Date:   Wed, 4 Oct 2023 07:49:47 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Max Chou <max.chou@...ltek.com>
Cc:     Bagas Sanjaya <bagasdotme@...il.com>,
        Hilda Wu <hildawu@...ltek.com>,
        "alex_lu@...lsil.com.cn" <alex_lu@...lsil.com.cn>,
        Luiz Augusto von Dentz <luiz.von.dentz@...el.com>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Juerg Haefliger <juerg.haefliger@...onical.com>,
        Linux Bluetooth <linux-bluetooth@...r.kernel.org>,
        Thorsten Leemhuis <linux@...mhuis.info>,
        Linux Regressions <regressions@...ts.linux.dev>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Regression: devcoredump patch broke Realtek usb bluetooth adapter

On Wed, Oct 04, 2023 at 03:07:24AM +0000, Max Chou wrote:
> 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)

I don't see anything obviously wrong in dmesg. Attached hciconfig and
dmesg for both functional and broken cases.

-- 
  Kiryl Shutsemau / Kirill A. Shutemov

View attachment "dmesg.bad" of type "text/plain" (73913 bytes)

View attachment "dmesg.good" of type "text/plain" (74342 bytes)

View attachment "hciconfig.bad" of type "text/plain" (317 bytes)

View attachment "hciconfig.good" of type "text/plain" (671 bytes)