This is actually v4. With this patch applied, dmesg on device plug looks like this and has no more suspend-resume-cycle: [ 454.845205] xhci_hcd:handle_port_status: xhci_hcd 0000:00:14.0: Port Status Change Event for port 19 [ 454.845215] xhci_hcd:handle_port_status: xhci_hcd 0000:00:14.0: resume root hub [ 454.845231] xhci_hcd:handle_port_status: xhci_hcd 0000:00:14.0: handle_port_status: starting port polling. [ 454.845295] usbcore:usb_remote_wakeup: usb usb2: usb wakeup-resume [ 454.845303] usbcore:hcd_bus_resume: usb usb2: usb auto-resume [ 454.845324] usbcore:hub_resume: hub 2-0:1.0: hub_resume [ 454.845343] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: get port status, actual port 0 status = 0x2a0 [ 454.845351] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: Get port status returned 0x2a0 [ 454.845382] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: get port status, actual port 1 status = 0x2a0 [ 454.845386] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: Get port status returned 0x2a0 [ 454.845402] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: get port status, actual port 2 status = 0x4002c0 [ 454.845406] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: Get port status returned 0x4002c0 [ 454.845423] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: get port status, actual port 3 status = 0x2a0 [ 454.845432] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: Get port status returned 0x2a0 [ 454.845489] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: get port status, actual port 4 status = 0x2a0 [ 454.845495] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: Get port status returned 0x2a0 [ 454.845510] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: get port status, actual port 5 status = 0x2a0 [ 454.845514] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: Get port status returned 0x2a0 [ 454.845539] usbcore:hub_event: hub 2-0:1.0: state 7 ports 6 chg 0000 evt 0008 [ 454.845549] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: get port status, actual port 2 status = 0x4002c0 [ 454.845553] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: Get port status returned 0x4002c0 [ 454.845565] usbcore:port_event: usb usb2-port3: link state change [ 454.845575] xhci_hcd:xhci_clear_port_change_bit: xhci_hcd 0000:00:14.0: clear port link state change, actual port 2 status = 0x2c0 [ 454.845586] usbcore:port_event: usb usb2-port3: do warm reset [ 454.853463] xhci_hcd:xhci_hub_status_data: xhci_hcd 0000:00:14.0: xhci_hub_status_data: stopping port polling. [ 454.905757] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: get port status, actual port 2 status = 0x2b0 [ 454.905763] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: Get port status returned 0x2b0 [ 454.905793] usbcore:hub_port_wait_reset: usb usb2-port3: not warm reset yet, waiting 50ms [ 454.950999] xhci_hcd:handle_port_status: xhci_hcd 0000:00:14.0: Port Status Change Event for port 19 [ 454.951010] xhci_hcd:handle_port_status: xhci_hcd 0000:00:14.0: handle_port_status: starting port polling. [ 454.965676] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: get port status, actual port 2 status = 0x2a1203 [ 454.965682] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: Get port status returned 0x310203 [ 454.965724] xhci_hcd:xhci_clear_port_change_bit: xhci_hcd 0000:00:14.0: clear port reset change, actual port 2 status = 0xa1203 [ 454.965742] xhci_hcd:xhci_clear_port_change_bit: xhci_hcd 0000:00:14.0: clear port warm(BH) reset change, actual port 2 status = 0x21203 [ 454.965760] xhci_hcd:xhci_clear_port_change_bit: xhci_hcd 0000:00:14.0: clear port link state change, actual port 2 status = 0x21203 [ 454.965773] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: get port status, actual port 2 status = 0x21203 [ 454.965777] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: Get port status returned 0x10203 [ 455.025707] usbcore:hub_event: hub 2-0:1.0: state 7 ports 6 chg 0000 evt 0008 [ 455.025726] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: get port status, actual port 2 status = 0x21203 [ 455.025731] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: Get port status returned 0x10203 [ 455.025763] xhci_hcd:xhci_clear_port_change_bit: xhci_hcd 0000:00:14.0: clear port connect change, actual port 2 status = 0x1203 [ 455.025777] usbcore:hub_port_connect_change: usb usb2-port3: status 0203, change 0001, 10.0 Gb/s [ 455.025785] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: get port status, actual port 2 status = 0x1203 [ 455.025790] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: Get port status returned 0x203 [ 455.061704] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: get port status, actual port 2 status = 0x1203 [ 455.061710] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: Get port status returned 0x203 [ 455.097673] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: get port status, actual port 2 status = 0x1203 [ 455.097679] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: Get port status returned 0x203 [ 455.121663] xhci_hcd:xhci_hub_status_data: xhci_hcd 0000:00:14.0: xhci_hub_status_data: stopping port polling. [ 455.133520] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: get port status, actual port 2 status = 0x1203 [ 455.133526] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: Get port status returned 0x203 [ 455.169674] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: get port status, actual port 2 status = 0x1203 [ 455.169680] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: Get port status returned 0x203 [ 455.169706] usbcore:hub_port_debounce: usb usb2-port3: debounce total 100ms stable 100ms status 0x203 [ 455.169718] xhci_hcd:xhci_ring_cmd_db: xhci_hcd 0000:00:14.0: // Ding dong! [ 455.169796] xhci_hcd:xhci_alloc_virt_device: xhci_hcd 0000:00:14.0: Slot 1 output ctx = 0x44e420000 (dma) [ 455.169802] xhci_hcd:xhci_alloc_virt_device: xhci_hcd 0000:00:14.0: Slot 1 input ctx = 0x456743000 (dma) [ 455.169814] xhci_hcd:xhci_alloc_virt_device: xhci_hcd 0000:00:14.0: Set slot id 1 dcbaa entry 000000008f69af20 to 0x44e420000 [ 455.169861] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: get port status, actual port 2 status = 0x1203 [ 455.169866] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: Get port status returned 0x203 [ 455.169886] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: set port reset, actual port 2 status = 0x1311 [ 455.169895] xhci_hcd:handle_port_status: xhci_hcd 0000:00:14.0: Port Status Change Event for port 19 [ 455.169900] xhci_hcd:handle_port_status: xhci_hcd 0000:00:14.0: handle_port_status: starting port polling. [ 455.237702] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: get port status, actual port 2 status = 0x201203 [ 455.237708] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: Get port status returned 0x100203 [ 455.237743] xhci_hcd:xhci_clear_port_change_bit: xhci_hcd 0000:00:14.0: clear port reset change, actual port 2 status = 0x1203 [ 455.237759] xhci_hcd:xhci_clear_port_change_bit: xhci_hcd 0000:00:14.0: clear port warm(BH) reset change, actual port 2 status = 0x1203 [ 455.237778] xhci_hcd:xhci_clear_port_change_bit: xhci_hcd 0000:00:14.0: clear port link state change, actual port 2 status = 0x1203 [ 455.237792] xhci_hcd:xhci_clear_port_change_bit: xhci_hcd 0000:00:14.0: clear port connect change, actual port 2 status = 0x1203 [ 455.237807] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: get port status, actual port 2 status = 0x1203 [ 455.237811] xhci_hcd:xhci_hub_control: xhci_hcd 0000:00:14.0: Get port status returned 0x203 [ 455.297761] xhci_hcd:xhci_setup_addressable_virt_dev: xhci_hcd 0000:00:14.0: Set root hub portnum to 19 [ 455.297768] xhci_hcd:xhci_setup_addressable_virt_dev: xhci_hcd 0000:00:14.0: Set fake root hub portnum to 3 [ 455.297773] xhci_hcd:xhci_setup_addressable_virt_dev: xhci_hcd 0000:00:14.0: udev->tt = (null) [ 455.297778] xhci_hcd:xhci_setup_addressable_virt_dev: xhci_hcd 0000:00:14.0: udev->ttport = 0x0 [ 455.297786] xhci_hcd:xhci_ring_cmd_db: xhci_hcd 0000:00:14.0: // Ding dong! [ 455.297856] xhci_hcd:xhci_dbg_trace: xhci_hcd 0000:00:14.0: Successful setup address command [ 455.297868] xhci_hcd:xhci_dbg_trace: xhci_hcd 0000:00:14.0: Op regs DCBAA ptr = 0x0000045673a000 [ 455.297875] xhci_hcd:xhci_dbg_trace: xhci_hcd 0000:00:14.0: Slot ID 1 dcbaa entry @000000008f69af20 = 0x0000044e420000 [ 455.297880] xhci_hcd:xhci_dbg_trace: xhci_hcd 0000:00:14.0: Output Context DMA address = 0x44e420000 [ 455.297885] xhci_hcd:xhci_dbg_trace: xhci_hcd 0000:00:14.0: Internal device address = 0 [ 455.297895] usb 2-3: new SuperSpeed Gen 1 USB device number 2 using xhci_hcd [ 455.318310] usbcore:usb_parse_endpoint: usb 2-3: skipped 1 descriptor after endpoint [ 455.318316] usbcore:usb_parse_endpoint: usb 2-3: skipped 1 descriptor after endpoint [ 455.318347] xhci_hcd:process_ctrl_td: xhci_hcd 0000:00:14.0: Waiting for status stage event [ 455.318393] usbcore:usb_get_langid: usb 2-3: default language 0x0409 [ 455.318425] xhci_hcd:process_ctrl_td: xhci_hcd 0000:00:14.0: Waiting for status stage event [ 455.318504] xhci_hcd:process_ctrl_td: xhci_hcd 0000:00:14.0: Waiting for status stage event [ 455.318584] xhci_hcd:process_ctrl_td: xhci_hcd 0000:00:14.0: Waiting for status stage event [ 455.318634] usbcore:usb_new_device: usb 2-3: udev 2, busnum 2, minor = 129 [ 455.318639] usb 2-3: New USB device found, idVendor=0781, idProduct=5596, bcdDevice= 1.00 [ 455.318643] usb 2-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 455.318647] usb 2-3: Product: Ultra T C [ 455.318650] usb 2-3: Manufacturer: SanDisk [ 455.318653] usb 2-3: SerialNumber: 4C530001090830111403 ... Do we still want / need to fix the status_urb == NULL problem from xhci? Jan-Marek
