Documentation/ABI/testing/usb-uevent

   1 What:           Raise a uevent when a USB Host Controller has died
   2 Date:           2019-04-17
   3 KernelVersion:  5.2
   4 Contact:        linux-usb@vger.kernel.org
   5 Description:    When the USB Host Controller has entered a state where it is no
   6                 longer functional a uevent will be raised. The uevent will
   7                 contain ACTION=offline and ERROR=DEAD.
   8
   9                 Here is an example taken using udevadm monitor -p::
  10
  11                     KERNEL[130.428945] offline  /devices/pci0000:00/0000:00:10.0/usb2 (usb)
  12                     ACTION=offline
  13                     BUSNUM=002
  14                     DEVNAME=/dev/bus/usb/002/001
  15                     DEVNUM=001
  16                     DEVPATH=/devices/pci0000:00/0000:00:10.0/usb2
  17                     DEVTYPE=usb_device
  18                     DRIVER=usb
  19                     ERROR=DEAD
  20                     MAJOR=189
  21                     MINOR=128
  22                     PRODUCT=1d6b/2/414
  23                     SEQNUM=2168
  24                     SUBSYSTEM=usb
  25                     TYPE=9/0/1
  26
  27 Users:          chromium-os-dev@chromium.org