Xhci driver handles USB transaction errors on transfer events, but transaction errors are possible on address device command completion events as well.
The xHCI specification (section 4.6.5) says: A USB Transaction Error Completion Code for an Address Device Command may be due to a Stall response from a device. Software should issue a Disable Slot Command for the Device Slot then an Enable Slot Command to recover from this error. The related discussion threads can be found through below links. http://marc.info/?l=linux-usb&m=149362010728921&w=2 http://marc.info/?l=linux-usb&m=149252752825755&w=2 This patch set includes some fixes in xhci_disable_slot() as well which will be used to handle USB transaction error on address command. --- Change log: v1->v2: - include 4 fixes in xhci_disable_slot which will be used to handle USB transaction error on address command. Lu Baolu (5): usb: xhci: Disable slot even virt-dev is null usb: xhci: Fix potential memory leak in xhci_disable_slot() usb: xhci: Fix memory leak when xhci_disable_slot() returns error usb: xhci: Return error when host is dead in xhci_disable_slot() usb: xhci: Handle USB transaction error on address command drivers/usb/host/xhci-hub.c | 2 +- drivers/usb/host/xhci.c | 52 ++++++++++++++++++--------------------------- drivers/usb/host/xhci.h | 3 +-- 3 files changed, 23 insertions(+), 34 deletions(-) -- 2.7.4
