usb-uevent

 1What:		Raise a uevent when a USB Host Controller has died
 2Date:		2019-04-17
 3KernelVersion:	5.2
 4Contact:	linux-usb@vger.kernel.org
 5Description:	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
27Users:		chromium-os-dev@chromium.org