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commit 2c1dda2acc4192d826e84008d963b528e24d12bc upstream. Fake CSR controllers don't seem to handle short-transfer properly which cause command to time out: kernel: usb 1-1: new full-speed USB device number 19 using xhci_hcd kernel: usb 1-1: New USB device found, idVendor=0a12, idProduct=0001, bcdDevice=88.91 kernel: usb 1-1: New USB device strings: Mfr=0, Product=2, SerialNumber=0 kernel: usb 1-1: Product: BT DONGLE10 ... Bluetooth: hci1: Opcode 0x1004 failed: -110 kernel: Bluetooth: hci1: command 0x1004 tx timeout According to USB Spec 2.0 Section 5.7.3 Interrupt Transfer Packet Size Constraints a interrupt transfer is considered complete when the size is 0 (ZPL) or < wMaxPacketSize: 'When an interrupt transfer involves more data than can fit in one data payload of the currently established maximum size, all data payloads are required to be maximum-sized except for the last data payload, which will contain the remaining data. An interrupt transfer is complete when the endpoint does one of the following: • Has transferred exactly the amount of data expected • Transfers a packet with a payload size less than wMaxPacketSize or transfers a zero-length packet' Link: https://bugzilla.kernel.org/show_bug.cgi?id=219365 Fixes: 7b05933340f4 ("Bluetooth: btusb: Fix not handling ZPL/short-transfer") Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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| README | ||
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 Restructured Text 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.