Comment 235 for bug 1667750

Some times the warning doesn't appear. Instead the the driver crashed:
$ dmidecode
Manufacturer: ASUSTeK COMPUTER INC.
Product Name: X555UB

$ cat /proc/cpuinfo
model name : Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz

device connected to USB 3:

[10799.155340] usb 1-2: reset high-speed USB device number 12 using xhci_hcd
[10799.310446] ieee80211 phy5: rt2x00_set_rt: Info - RT chipset 3070, rev 0201 detected
[10799.364982] ieee80211 phy5: rt2x00_set_rf: Info - RF chipset 0005 detected
[10799.365842] ieee80211 phy5: Selected rate control algorithm 'minstrel_ht'
[10799.412456] rt2800usb 1-2:1.0 wlp0s20f0u2: renamed from wlan0
[10799.432236] ieee80211 phy5: rt2x00lib_request_firmware: Info - Loading firmware file 'rt2870.bin'
[10799.432263] ieee80211 phy5: rt2x00lib_request_firmware: Info - Firmware detected - version: 0.36
[10799.728051] ieee80211 phy5: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x0404 with error -71
[10800.745185] ieee80211 phy5: rt2800_wait_csr_ready: Error - Unstable hardware
[10800.745197] ieee80211 phy5: rt2800usb_set_device_state: Error - Device failed to enter state 4 (-5)
...
[11237.887923] xhci_hcd 0000:00:14.0: WARN Cannot submit Set TR Deq Ptr
[11237.887929] xhci_hcd 0000:00:14.0: A Set TR Deq Ptr command is pending.

xhci is unstable - not the hardware.

The same device, connected to the same notebook, but to a USB 2 port:
[11243.042957] usb 1-3: reset high-speed USB device number 13 using xhci_hcd
[11243.197261] ieee80211 phy6: rt2x00_set_rt: Info - RT chipset 3070, rev 0201 detected
[11243.251969] ieee80211 phy6: rt2x00_set_rf: Info - RF chipset 0005 detected
[11243.253036] ieee80211 phy6: Selected rate control algorithm 'minstrel_ht'
[11243.272919] rt2800usb 1-3:1.0 wlp0s20f0u3: renamed from wlan0
[11243.293056] ieee80211 phy6: rt2x00lib_request_firmware: Info - Loading firmware file 'rt2870.bin'
[11243.293082] ieee80211 phy6: rt2x00lib_request_firmware: Info - Firmware detected - version: 0.36