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Some Barrot based USB Bluetooth dongles erroneously send one extra random byte for the HCI_OP_READ_LOCAL_EXT_FEATURES command. The consequence of that is that the next HCI transfer is misaligned by one byte causing undefined behavior. In most cases the response event for the next command fails with random error code. Since the HCI_OP_READ_LOCAL_EXT_FEATURES command is used during HCI controller initialization, the initialization fails rendering the USB dongle not usable. > [59.464099] usb 1-1.3: new full-speed USB device number 11 using xhci_hcd > [59.561617] usb 1-1.3: New USB device found, idVendor=33fa, idProduct=0012, bcdDevice=88.91 > [59.561642] usb 1-1.3: New USB device strings: Mfr=0, Product=2, SerialNumber=0 > [59.561656] usb 1-1.3: Product: UGREEN BT6.0 Adapter > [61.720116] Bluetooth: hci1: command 0x1005 tx timeout > [61.720167] Bluetooth: hci1: Opcode 0x1005 failed: -110 This patch was tested with the 33fa:0012 device. The info from the /sys/kernel/debug/usb/devices is shown below: T: Bus=01 Lev=02 Prnt=02 Port=02 Cnt=01 Dev#= 12 Spd=12 MxCh= 0 D: Ver= 2.00 Cls=e0(wlcon) Sub=01 Prot=01 MxPS=64 #Cfgs= 1 P: Vendor=33fa ProdID=0012 Rev=88.91 S: Product=UGREEN BT6.0 Adapter C:* #Ifs= 2 Cfg#= 1 Atr=c0 MxPwr=100mA I:* If#= 0 Alt= 0 #EPs= 3 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb E: Ad=81(I) Atr=03(Int.) MxPS= 16 Ivl=1ms E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms E: Ad=82(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms I:* If#= 1 Alt= 0 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb E: Ad=03(O) Atr=01(Isoc) MxPS= 0 Ivl=1ms E: Ad=83(I) Atr=01(Isoc) MxPS= 0 Ivl=1ms I: If#= 1 Alt= 1 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb E: Ad=03(O) Atr=01(Isoc) MxPS= 9 Ivl=1ms E: Ad=83(I) Atr=01(Isoc) MxPS= 9 Ivl=1ms I: If#= 1 Alt= 2 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb E: Ad=03(O) Atr=01(Isoc) MxPS= 17 Ivl=1ms E: Ad=83(I) Atr=01(Isoc) MxPS= 17 Ivl=1ms I: If#= 1 Alt= 3 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb E: Ad=03(O) Atr=01(Isoc) MxPS= 25 Ivl=1ms E: Ad=83(I) Atr=01(Isoc) MxPS= 25 Ivl=1ms I: If#= 1 Alt= 4 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb E: Ad=03(O) Atr=01(Isoc) MxPS= 33 Ivl=1ms E: Ad=83(I) Atr=01(Isoc) MxPS= 33 Ivl=1ms I: If#= 1 Alt= 5 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb E: Ad=03(O) Atr=01(Isoc) MxPS= 49 Ivl=1ms E: Ad=83(I) Atr=01(Isoc) MxPS= 49 Ivl=1ms Now the device is initialized properly: > [43.329852] usb 1-1.4: new full-speed USB device number 4 using dwc_otg > [43.446790] usb 1-1.4: New USB device found, idVendor=33fa, idProduct=0012, bcdDevice=88.91 > [43.446813] usb 1-1.4: New USB device strings: Mfr=0, Product=2, SerialNumber=0 > [43.446821] usb 1-1.4: Product: UGREEN BT6.0 Adapter > [43.582024] Bluetooth: hci1: Unexpected continuation: 1 bytes > [43.703025] Bluetooth: hci1: Unexpected continuation: 1 bytes > [43.750141] Bluetooth: MGMT ver 1.23 Link: https://github.com/bluez/bluez/issues/1326 Signed-off-by: Arkadiusz Bokowy <arkadiusz.bokowy@gmail.com> Tested-by: Arkadiusz Bokowy <arkadiusz.bokowy@gmail.com> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.