Files
linux/drivers/usb/core
Feng Mingli f092c995c3 USB: core: flush pending URBs for unusual USB3 core when disable device
According to xHCI spec v1.1 section 6.4.5 TRB Completion Codes,
the standard XHCI controller provide a TRB Completion Status
'USB Transaction Error' to asserted in the case where the host
did not receive a valid response from the device, it's useful
to handle pending URBs on the endpoint when the USB device is
plugged out.

Unfortunately, some SOCs USB 3.0 modules lose the ability to
assert the 'USB Transaction Error' status when USB 3.0 device
disconnect. This may cause the pending URBs unhandled, even
lead to USB class driver stalled in waiting for URBs complete.

This patch flush pending URBs in usb_disable_device() when
USB 3.0 device disconnect, it will call xhci_urb_dequeue()
-> xhci_queue_stop_endpoint() to cancel pending URBs and
giveback URB status immediately.

Change-Id: If8acac59bc1f2c10a41ee390ccbeb84b2e7743c1
Signed-off-by: Feng Mingli <fml@rock-chips.com>
Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
2017-11-10 19:58:22 +08:00
..
2014-09-23 22:33:19 -07:00
2017-05-25 14:30:07 +02:00