[Bug 219571] New: Previous handle short-transfer fix for fake CSR controllers does not account for other fake devices

[Bug 219571] New: Previous handle short-transfer fix for fake CSR controllers does not account for other fake devices

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=219571

            Bug ID: 219571
           Summary: Previous handle short-transfer fix for fake CSR
                    controllers does not account for other fake devices
           Product: Drivers
           Version: 2.5
          Hardware: AMD
                OS: Linux
            Status: NEW
          Severity: high
          Priority: P3
         Component: Bluetooth
          Assignee: linux-bluetooth@vger.kernel.org
          Reporter: sohailsameja@gmail.com
        Regression: Yes
           Bisected 2c1dda2acc4192d826e84008d963b528e24d12bc
         commit-id:

[  +9.730469] usb 1-1: new full-speed USB device number 10 using xhci_hcd
[  +3.071646] usb 1-2: new full-speed USB device number 11 using xhci_hcd
[  +0.374696] usb 1-2: New USB device found, idVendor=10d7, idProduct=b012,
bcdDevice=88.91
[  +0.000009] usb 1-2: New USB device strings: Mfr=0, Product=2, SerialNumber=0
[  +0.000003] usb 1-2: Product: CSR8510 A10
[  +0.017967] Bluetooth: hci0: HCI Read Default Erroneous Data Reporting
command is advertised, but not supported.
[  +0.000007] Bluetooth: hci0: HCI Read Transmit Power Level command is
advertised, but not supported.
[  +0.000002] Bluetooth: hci0: HCI LE Set Random Private Address Timeout
command is advertised, but not supported.


Some fake CSR controllers can also be identified as "Actions Semiconductor
ATS2851 based devices" i.e. 0x10d7, 0xb012 as seen above.

The previous fix should also account for such devices as well.

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[Bug 219571] Previous handle short-transfer fix for fake CSR controllers does not account for other fake devices

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=219571

--- Comment #1 from Mohamed Sohail (sohailsameja@gmail.com) ---
[  +2.061002] Bluetooth: hci0: Opcode 0x1004 failed: -110
[  +0.000003] Bluetooth: hci0: command 0x1004 tx timeout


Forgot the above lines. Either reverting to the old code size handling code i.e
        size = le16_to_cpu(data->intr_ep->wMaxPacketSize); or changing the
device identifier to match 0x10d7, 0xb012  fixes this.

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[Bug 219571] Previous handle short-transfer fix for fake CSR controllers does not account for other fake devices

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=219571

Luzemario (luzemario@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |luzemario@gmail.com

--- Comment #2 from Luzemario (luzemario@gmail.com) ---
My device has the same product description, but appears to the system as a
different product code. And fails.

[  444.694776] usb 4-2: New USB device found, idVendor=0a12, idProduct=0001,
bcdDevice=25.20
[  444.694792] usb 4-2: New USB device strings: Mfr=0, Product=2,
SerialNumber=0
[  444.694799] usb 4-2: Product: CSR8510 A10
[  445.284957] usbcore: registered new interface driver btusb
[  445.286700] Bluetooth: hci0: CSR: Setting up dongle with HCI ver=6 rev=3120
[  445.286711] Bluetooth: hci0: LMP ver=6 subver=22bb; manufacturer=10
[  445.286714] Bluetooth: hci0: CSR: Unbranded CSR clone detected; adding
workarounds and force-suspending once...
[  450.486604] Bluetooth: hci0: CSR: Couldn't suspend the device for our Barrot
8041a02 receive-issue workaround
[  450.486705] Bluetooth: hci0: HCI Delete Stored Link Key command is
advertised, but not supported.
[  450.486712] Bluetooth: hci0: HCI Read Default Erroneous Data Reporting
command is advertised, but not supported.
[  450.486717] Bluetooth: hci0: HCI Set Event Filter command not supported.
[  452.500066] Bluetooth: hci0: Opcode 0x0c03 failed: -110

It enters a broken state when the force-suspend command is issued, then
timeouts the reset command afterwards.

Linux desk 6.12.111+deb13-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.12.111-1
(2026-09-28) x86_64 GNU/Linux

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