Comment 245 for bug 1667750

The "WARN Set TR Deq Ptr cmd failed due to incorrect slot or ep state" doesn't flood the log file. The message appear only if the device is disconnected (after xhci died):

Connected the device:
[42407.193511] usb 1-2: ath9k_htc: USB layer deinitialized
[42410.956671] usb 1-2: new high-speed USB device number 9 using xhci_hcd
[42411.214091] usb 1-2: New USB device found, idVendor=0cf3, idProduct=9271, bcdDevice= 1.08
[42411.214095] usb 1-2: New USB device strings: Mfr=16, Product=32, SerialNumber=48
[42411.214098] usb 1-2: Product: USB2.0 WLAN
[42411.214100] usb 1-2: Manufacturer: ATHEROS
[42411.214102] usb 1-2: SerialNumber: 12345
[42411.232116] usb 1-2: ath9k_htc: Firmware ath9k_htc/htc_9271-1.4.0.fw requested
[42412.308181] usb 1-2: ath9k_htc: Transferred FW: ath9k_htc/htc_9271-1.4.0.fw, size: 51008
[42412.558320] ath9k_htc 1-2:1.0: ath9k_htc: HTC initialized with 33 credits
[42412.784721] ath9k_htc 1-2:1.0: ath9k_htc: FW Version: 1.4
[42412.784724] ath9k_htc 1-2:1.0: FW RMW support: On
[42412.784726] ath: EEPROM regdomain: 0x809c
[42412.784727] ath: EEPROM indicates we should expect a country code
[42412.784728] ath: doing EEPROM country->regdmn map search
[42412.784729] ath: country maps to regdmn code: 0x52
[42412.784730] ath: Country alpha2 being used: CN
[42412.784731] ath: Regpair used: 0x52
[42412.788460] ieee80211 phy2: Atheros AR9271 Rev:1
[42412.791852] ath9k_htc 1-2:1.0 wlp3s0f0u2: renamed from wlan0

and everything is looking fine.

after running the device for a few minutes
[42445.806367] device wlp3s0f0u2 entered promiscuous mode

we receive the first indication that xhci died
[42911.706734] ath: phy2: Unable to set channel

and the device stops working. There are absolutely no other error messages, shwon by dmesg or the running application (in this case hcxdumptool).

Now we disconnect the device and got the final warning:
[43082.759737] usb 1-2: USB disconnect, device number 9
[43082.760434] xhci_hcd 0000:03:00.0: WARN Set TR Deq Ptr cmd failed due to incorrect slot or ep state.
[43082.760607] xhci_hcd 0000:03:00.0: WARN Set TR Deq Ptr cmd failed due to incorrect slot or ep state.
[43082.764275] xhci_hcd 0000:03:00.0: WARN Set TR Deq Ptr cmd failed due to incorrect slot or ep state.
[43082.784722] device wlp3s0f0u2 left promiscuous mode

At this point xhci is dead. No other device connected to the same port is working.