5.4-stable review patch. If anyone has any objections, please let me know.
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From: Luiz Augusto von Dentz luiz.von.dentz@intel.com
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 --- drivers/bluetooth/btusb.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-)
--- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -834,10 +834,15 @@ static int btusb_submit_intr_urb(struct if (!urb) return -ENOMEM;
- /* Use maximum HCI Event size so the USB stack handles - * ZPL/short-transfer automatically. - */ - size = HCI_MAX_EVENT_SIZE; + if (le16_to_cpu(data->udev->descriptor.idVendor) == 0x0a12 && + le16_to_cpu(data->udev->descriptor.idProduct) == 0x0001) + /* Fake CSR devices don't seem to support sort-transter */ + size = le16_to_cpu(data->intr_ep->wMaxPacketSize); + else + /* Use maximum HCI Event size so the USB stack handles + * ZPL/short-transfer automatically. + */ + size = HCI_MAX_EVENT_SIZE;
buf = kmalloc(size, mem_flags); if (!buf) {