When disconnecting a USB hub that has some child device(s) connected to it (such as a USB mouse), then the stack tries to clear halt and reset device(s) which are _already_ physically disconnected. The issue has been reproduced with: CPU: IMX6D5EYM10AD or MCIMX6D5EYM10AE. SW: U-Boot 2019.07 and kernel 4.19.40. In this situation there will be error bit for MMF active yet the CERR equals EHCI_TUNE_CERR + halt. Existing implementation interprets this as a stall [1] (chapter 8.4.5). Fix for the issue is at first to check for a stall that comes after an error (the CERR has been decreased). Then after that, check for other errors. And at last check for stall without other errors (the CERR equals EHCI_TUNE_CERR as stall does not decrease the CERR [2] (table 3-16)). What happens after the fix is that when disconnecting a hub with attached device(s) the situation is not interpret as a stall. The specification [2] is not clear about error priorities, but since there is no explicit error bit for the stall, it is assumed to be lower priority than other errors. [1] https://www.usb.org/document-library/usb-20-specification, usb_20.pdf [2] https://www.intel.com/content/dam/www/public/us/en/documents/technical-specifications/ehci-specification-for-usb.pdf Signed-off-by: Erkka Talvitie <erkka.talvitie@xxxxxxxxx> --- Following test steps were executed to first demonstrate the issue and then to verify the fix: --> Attach a mouse into host port and then disconnect it. --> Attach a keyboard into host port and then disconnect it. --> Attach a KVM switch into host port and then disconnect it. --> Attach a KVM switch into host port, attach a mouse into the KVM and then disconnect it. --> Re-attach the mouse into the KVM and then disconnect the KVM switch. --> Attach a KVM switch into host port, attach a keyboard into the KVM and then disconnect it. --> Re-attach the keyboard into the KVM and then disconnect the KVM switch. --> Attach a KVM switch into host port, attach a mouse and a keyboard into the KVM and then disconnect the KVM switch. --> End test. Output without the fix: --> Attach a mouse into host port and then disconnect it. kernel: [ 374.409837] usb 2-1.2: new low-speed USB device number 16 using ci_hdrc kernel: [ 374.673010] input: Logitech USB Optical Mouse as /devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-1/2-1.2/2-1.2:1.0/0003:046D:C05F.0006/input/input7 kernel: [ 374.674044] hid-generic 0003:046D:C05F.0006: input: USB HID v1.11 Mouse [Logitech USB Optical Mouse] on usb-ci_hdrc.1-1.2/input0 weston[464]: [11:14:07.717] event6 - Logitech USB Optical Mouse: is tagged by udev as: Mouse weston[464]: [11:14:07.717] event6 - Logitech USB Optical Mouse: device is a pointer weston[464]: [11:14:07.718] libinput: configuring device "Logitech USB Optical Mouse". weston[464]: [11:14:07.718] associating input device event6 with output HDMI-A-1 (none by udev) kernel: [ 378.931298] usb 2-1.2: USB disconnect, device number 16 weston[464]: [11:14:11.668] event6 - Logitech USB Optical Mouse: device removed --> Attach a keyboard into host port and then disconnect it. kernel: [ 400.759884] usb 2-1.2: new low-speed USB device number 17 using ci_hdrc kernel: [ 401.025695] input: Dell Dell QuietKey Keyboard as /devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-1/2-1.2/2-1.2:1.0/0003:413C:2106.0007/input/input8 kernel: [ 401.090413] hid-generic 0003:413C:2106.0007: input: USB HID v1.10 Keyboard [Dell Dell QuietKey Keyboard] on usb-ci_hdrc.1-1.2/input0 systemd-logind[392]: Watching system buttons on /dev/input/event6 (Dell Dell QuietKey Keyboard) weston[464]: [11:14:33.992] event6 - Dell Dell QuietKey Keyboard: is tagged by udev as: Keyboard weston[464]: [11:14:33.994] event6 - Dell Dell QuietKey Keyboard: device is a keyboard weston[464]: [11:14:33.995] libinput: configuring device "Dell Dell QuietKey Keyboard". weston[464]: [11:14:33.996] associating input device event6 with output HDMI-A-1 (none by udev) kernel: [ 404.230882] usb 2-1.2: USB disconnect, device number 17 weston[464]: [11:14:37.047] event6 - Dell Dell QuietKey Keyboard: device removed --> Attach a KVM switch into host port and then disconnect it. kernel: [ 424.059844] usb 2-1.2: new high-speed USB device number 18 using ci_hdrc kernel: [ 424.315581] hub 2-1.2:1.0: USB hub found kernel: [ 424.316179] hub 2-1.2:1.0: 4 ports detected kernel: [ 428.268438] usb 2-1.2: USB disconnect, device number 18 --> Attach a KVM switch into host port, attach a mouse into the KVM and then disconnect it. kernel: [ 443.509853] usb 2-1.2: new high-speed USB device number 19 using ci_hdrc kernel: [ 443.763137] hub 2-1.2:1.0: USB hub found kernel: [ 443.763860] hub 2-1.2:1.0: 4 ports detected kernel: [ 448.299911] usb 2-1.2.2: new low-speed USB device number 20 using ci_hdrc kernel: [ 448.463160] input: Logitech USB Optical Mouse as /devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-1/2-1.2/2-1.2.2/2-1.2.2:1.0/0003:046D:C05F.0008/input/input9 kernel: [ 448.463380] hid-generic 0003:046D:C05F.0008: input: USB HID v1.11 Mouse [Logitech USB Optical Mouse] on usb-ci_hdrc.1-1.2.2/input0 weston[464]: [11:15:21.508] event6 - Logitech USB Optical Mouse: is tagged by udev as: Mouse weston[464]: [11:15:21.508] event6 - Logitech USB Optical Mouse: device is a pointer weston[464]: [11:15:21.509] libinput: configuring device "Logitech USB Optical Mouse". weston[464]: [11:15:21.509] associating input device event6 with output HDMI-A-1 (none by udev) kernel: [ 453.915419] usb 2-1.2.2: USB disconnect, device number 20 weston[464]: [11:15:26.655] event6 - Logitech USB Optical Mouse: device removed --> Re-attach the mouse into the KVM and then disconnect the KVM switch. kernel: [ 468.519841] usb 2-1.2.2: new low-speed USB device number 21 using ci_hdrc kernel: [ 468.683002] input: Logitech USB Optical Mouse as /devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-1/2-1.2/2-1.2.2/2-1.2.2:1.0/0003:046D:C05F.0009/input/input10 kernel: [ 468.683202] hid-generic 0003:046D:C05F.0009: input: USB HID v1.11 Mouse [Logitech USB Optical Mouse] on usb-ci_hdrc.1-1.2.2/input0 weston[464]: [11:15:41.727] event6 - Logitech USB Optical Mouse: is tagged by udev as: Mouse weston[464]: [11:15:41.728] event6 - Logitech USB Optical Mouse: device is a pointer weston[464]: [11:15:41.728] libinput: configuring device "Logitech USB Optical Mouse". weston[464]: [11:15:41.728] associating input device event6 with output HDMI-A-1 (none by udev) kernel: [ 471.118091] usb 2-1.2: clear tt 1 (0150) error -71 kernel: [ 471.134041] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 471.138266] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 471.142515] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 471.146773] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 471.151013] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 471.151020] usb 2-1.2-port2: Cannot enable. Maybe the USB cable is bad? kernel: [ 471.155259] usb 2-1.2-port2: cannot disable (err = -71) kernel: [ 471.159542] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 471.163765] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 471.168007] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 471.172267] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 471.176507] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 471.176512] usb 2-1.2-port2: Cannot enable. Maybe the USB cable is bad? kernel: [ 471.180763] usb 2-1.2-port2: cannot disable (err = -71) kernel: [ 471.185022] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 471.189261] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 471.194198] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 471.198273] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 471.202514] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 471.202521] usb 2-1.2-port2: Cannot enable. Maybe the USB cable is bad? kernel: [ 471.206757] usb 2-1.2-port2: cannot disable (err = -71) kernel: [ 471.211024] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 471.215257] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 471.219524] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 471.223767] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 471.228007] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 471.228013] usb 2-1.2-port2: Cannot enable. Maybe the USB cable is bad? kernel: [ 471.232261] usb 2-1.2-port2: cannot disable (err = -71) kernel: [ 471.236514] usb 2-1.2-port2: cannot disable (err = -71) kernel: [ 471.240801] hub 2-1.2:1.0: hub_ext_port_status failed (err = -71) weston[464]: [11:15:43.974] event6 - Logitech USB Optical Mouse: device removed kernel: [ 471.276392] usb 2-1.2: USB disconnect, device number 19 kernel: [ 471.276404] usb 2-1.2.2: USB disconnect, device number 21 --> Attach a KVM switch into host port, attach a keyboard into the KVM and then disconnect it. kernel: [ 489.339839] usb 2-1.2: new high-speed USB device number 22 using ci_hdrc kernel: [ 489.602886] hub 2-1.2:1.0: USB hub found kernel: [ 489.603397] hub 2-1.2:1.0: 4 ports detected kernel: [ 493.869845] usb 2-1.2.2: new low-speed USB device number 23 using ci_hdrc kernel: [ 494.046950] input: Dell Dell QuietKey Keyboard as /devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-1/2-1.2/2-1.2.2/2-1.2.2:1.0/0003:413C:2106.000A/input/input11 kernel: [ 494.112909] hid-generic 0003:413C:2106.000A: input: USB HID v1.10 Keyboard [Dell Dell QuietKey Keyboard] on usb-ci_hdrc.1-1.2.2/input0 systemd-logind[392]: Watching system buttons on /dev/input/event6 (Dell Dell QuietKey Keyboard) weston[464]: [11:16:07.033] event6 - Dell Dell QuietKey Keyboard: is tagged by udev as: Keyboard weston[464]: [11:16:07.038] event6 - Dell Dell QuietKey Keyboard: device is a keyboard weston[464]: [11:16:07.040] libinput: configuring device "Dell Dell QuietKey Keyboard". weston[464]: [11:16:07.040] associating input device event6 with output HDMI-A-1 (none by udev) kernel: [ 498.303010] usb 2-1.2.2: USB disconnect, device number 23 weston[464]: [11:16:11.135] event6 - Dell Dell QuietKey Keyboard: device removed --> Re-attach the keyboard into the KVM and then disconnect the KVM switch. kernel: [ 510.509858] usb 2-1.2.2: new low-speed USB device number 24 using ci_hdrc kernel: [ 510.673159] input: Dell Dell QuietKey Keyboard as /devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-1/2-1.2/2-1.2.2/2-1.2.2:1.0/0003:413C:2106.000B/input/input12 kernel: [ 510.740488] hid-generic 0003:413C:2106.000B: input: USB HID v1.10 Keyboard [Dell Dell QuietKey Keyboard] on usb-ci_hdrc.1-1.2.2/input0 systemd-logind[392]: Watching system buttons on /dev/input/event6 (Dell Dell QuietKey Keyboard) weston[464]: [11:16:23.669] event6 - Dell Dell QuietKey Keyboard: is tagged by udev as: Keyboard weston[464]: [11:16:23.670] event6 - Dell Dell QuietKey Keyboard: device is a keyboard weston[464]: [11:16:23.672] libinput: configuring device "Dell Dell QuietKey Keyboard". weston[464]: [11:16:23.673] associating input device event6 with output HDMI-A-1 (none by udev) kernel: [ 513.808762] usb 2-1.2: clear tt 1 (0180) error -71 kernel: [ 513.824014] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 513.828254] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 513.832510] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 513.837034] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 513.841135] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 513.841141] usb 2-1.2-port2: Cannot enable. Maybe the USB cable is bad? kernel: [ 513.845391] usb 2-1.2-port2: cannot disable (err = -71) kernel: [ 513.849575] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 513.853760] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 513.858009] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 513.862264] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 513.866514] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 513.866521] usb 2-1.2-port2: Cannot enable. Maybe the USB cable is bad? kernel: [ 513.870812] usb 2-1.2-port2: cannot disable (err = -71) kernel: [ 513.875012] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 513.879253] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 513.883511] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 513.887763] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 513.892012] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 513.892019] usb 2-1.2-port2: Cannot enable. Maybe the USB cable is bad? kernel: [ 513.896267] usb 2-1.2-port2: cannot disable (err = -71) kernel: [ 513.900572] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 513.904776] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 513.909004] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 513.913290] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 513.917512] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 513.917517] usb 2-1.2-port2: Cannot enable. Maybe the USB cable is bad? kernel: [ 513.921769] usb 2-1.2-port2: cannot disable (err = -71) kernel: [ 513.926009] usb 2-1.2-port2: cannot disable (err = -71) kernel: [ 513.930372] hub 2-1.2:1.0: hub_ext_port_status failed (err = -71) weston[464]: [11:16:26.752] event6 - Dell Dell QuietKey Keyboard: device removed kernel: [ 514.028708] usb 2-1.2: USB disconnect, device number 22 kernel: [ 514.028721] usb 2-1.2.2: USB disconnect, device number 24 --> Attach a KVM switch into host port, attach a mouse and a keyboard into the KVM and then disconnect the KVM switch. kernel: [ 530.299896] usb 2-1.2: new high-speed USB device number 25 using ci_hdrc kernel: [ 530.553126] hub 2-1.2:1.0: USB hub found kernel: [ 530.553656] hub 2-1.2:1.0: 4 ports detected kernel: [ 534.580137] usb 2-1.2.2: new low-speed USB device number 26 using ci_hdrc kernel: [ 534.743092] input: Logitech USB Optical Mouse as /devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-1/2-1.2/2-1.2.2/2-1.2.2:1.0/0003:046D:C05F.000C/input/input13 kernel: [ 534.744022] hid-generic 0003:046D:C05F.000C: input: USB HID v1.11 Mouse [Logitech USB Optical Mouse] on usb-ci_hdrc.1-1.2.2/input0 weston[464]: [11:16:47.778] event6 - Logitech USB Optical Mouse: is tagged by udev as: Mouse weston[464]: [11:16:47.778] event6 - Logitech USB Optical Mouse: device is a pointer weston[464]: [11:16:47.779] libinput: configuring device "Logitech USB Optical Mouse". weston[464]: [11:16:47.779] associating input device event6 with output HDMI-A-1 (none by udev) kernel: [ 536.889928] usb 2-1.2.4: new low-speed USB device number 27 using ci_hdrc kernel: [ 537.054252] input: Dell Dell QuietKey Keyboard as /devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-1/2-1.2/2-1.2.4/2-1.2.4:1.0/0003:413C:2106.000D/input/input14 kernel: [ 537.120711] hid-generic 0003:413C:2106.000D: input: USB HID v1.10 Keyboard [Dell Dell QuietKey Keyboard] on usb-ci_hdrc.1-1.2.4/input0 systemd-logind[392]: Watching system buttons on /dev/input/event7 (Dell Dell QuietKey Keyboard) weston[464]: [11:16:50.022] event7 - Dell Dell QuietKey Keyboard: is tagged by udev as: Keyboard weston[464]: [11:16:50.024] event7 - Dell Dell QuietKey Keyboard: device is a keyboard weston[464]: [11:16:50.025] libinput: configuring device "Dell Dell QuietKey Keyboard". weston[464]: [11:16:50.026] associating input device event7 with output HDMI-A-1 (none by udev) kernel: [ 540.962649] usb 2-1.2: clear tt 1 (01a0) error -71 kernel: [ 540.966889] usb 2-1.2: clear tt 1 (01b0) error -71 kernel: [ 540.974144] usb 2-1.2-port4: cannot reset (err = -71) kernel: [ 540.978389] usb 2-1.2-port4: cannot reset (err = -71) kernel: [ 540.982519] usb 2-1.2-port4: cannot reset (err = -71) kernel: [ 540.986762] usb 2-1.2-port4: cannot reset (err = -71) kernel: [ 540.991019] usb 2-1.2-port4: cannot reset (err = -71) kernel: [ 540.991025] usb 2-1.2-port4: Cannot enable. Maybe the USB cable is bad? kernel: [ 540.995254] usb 2-1.2-port4: cannot disable (err = -71) kernel: [ 540.999529] usb 2-1.2-port4: cannot reset (err = -71) kernel: [ 541.003785] usb 2-1.2-port4: cannot reset (err = -71) kernel: [ 541.008015] usb 2-1.2-port4: cannot reset (err = -71) kernel: [ 541.012276] usb 2-1.2-port4: cannot reset (err = -71) kernel: [ 541.016511] usb 2-1.2-port4: cannot reset (err = -71) kernel: [ 541.016517] usb 2-1.2-port4: Cannot enable. Maybe the USB cable is bad? kernel: [ 541.020910] usb 2-1.2-port4: cannot disable (err = -71) kernel: [ 541.025107] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 541.029286] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 541.033522] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 541.037793] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 541.042021] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 541.042028] usb 2-1.2-port2: Cannot enable. Maybe the USB cable is bad? kernel: [ 541.046269] usb 2-1.2-port2: cannot disable (err = -71) kernel: [ 541.050543] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 541.054753] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 541.059005] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 541.063266] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 541.067513] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 541.067518] usb 2-1.2-port2: Cannot enable. Maybe the USB cable is bad? kernel: [ 541.071769] usb 2-1.2-port2: cannot disable (err = -71) kernel: [ 541.076005] usb 2-1.2-port4: cannot reset (err = -71) kernel: [ 541.080324] usb 2-1.2-port4: cannot reset (err = -71) kernel: [ 541.084543] usb 2-1.2-port4: cannot reset (err = -71) kernel: [ 541.088762] usb 2-1.2-port4: cannot reset (err = -71) kernel: [ 541.093018] usb 2-1.2-port4: cannot reset (err = -71) kernel: [ 541.093024] usb 2-1.2-port4: Cannot enable. Maybe the USB cable is bad? kernel: [ 541.097261] usb 2-1.2-port4: cannot disable (err = -71) kernel: [ 541.101515] usb 2-1.2-port4: cannot reset (err = -71) kernel: [ 541.105751] usb 2-1.2-port4: cannot reset (err = -71) kernel: [ 541.110169] usb 2-1.2-port4: cannot reset (err = -71) kernel: [ 541.114265] usb 2-1.2-port4: cannot reset (err = -71) kernel: [ 541.118507] usb 2-1.2-port4: cannot reset (err = -71) kernel: [ 541.118512] usb 2-1.2-port4: Cannot enable. Maybe the USB cable is bad? kernel: [ 541.122763] usb 2-1.2-port4: cannot disable (err = -71) kernel: [ 541.127006] usb 2-1.2-port4: cannot disable (err = -71) kernel: [ 541.131266] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 541.135547] hub 2-1.2:1.0: hub_ext_port_status failed (err = -71) kernel: [ 541.139763] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 541.144017] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 541.148262] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 541.152513] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 541.152519] usb 2-1.2-port2: Cannot enable. Maybe the USB cable is bad? kernel: [ 541.156752] usb 2-1.2-port2: cannot disable (err = -71) kernel: [ 541.161031] usb 2-1.2-port2: cannot reset (err = -71) kernel: [ 541.164659] usb 2-1.2: USB disconnect, device number 25 kernel: [ 541.164670] usb 2-1.2.2: USB disconnect, device number 26 kernel: [ 541.165358] usb 2-1.2-port2: cannot reset (err = -71) weston[464]: [11:16:53.936] event7 - Dell Dell QuietKey Keyboard: device removed weston[464]: [11:16:53.976] event6 - Logitech USB Optical Mouse: device removed kernel: [ 541.271277] usb 2-1.2.4: USB disconnect, device number 27 --> End test. Output with the fix: --> Attach a mouse into host port and then disconnect it. kernel: [ 101.229751] usb 2-1.2: new low-speed USB device number 16 using ci_hdrc kernel: [ 101.496424] input: Logitech USB Optical Mouse as /devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-1/2-1.2/2-1.2:1.0/0003:046D:C05F.0006/input/input7 kernel: [ 101.497252] hid-generic 0003:046D:C05F.0006: input: USB HID v1.11 Mouse [Logitech USB Optical Mouse] on usb-ci_hdrc.1-1.2/input0 weston[486]: [11:34:50.974] event6 - Logitech USB Optical Mouse: is tagged by udev as: Mouse weston[486]: [11:34:50.975] event6 - Logitech USB Optical Mouse: device is a pointer weston[486]: [11:34:50.975] libinput: configuring device "Logitech USB Optical Mouse". weston[486]: [11:34:50.975] associating input device event6 with output HDMI-A-1 (none by udev) kernel: [ 104.418306] usb 2-1.2: USB disconnect, device number 16 weston[486]: [11:34:53.604] event6 - Logitech USB Optical Mouse: device removed --> Attach a keyboard into host port and then disconnect it. kernel: [ 126.829750] usb 2-1.2: new low-speed USB device number 17 using ci_hdrc kernel: [ 127.096213] input: Dell Dell QuietKey Keyboard as /devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-1/2-1.2/2-1.2:1.0/0003:413C:2106.0007/input/input8 kernel: [ 127.160286] hid-generic 0003:413C:2106.0007: input: USB HID v1.10 Keyboard [Dell Dell QuietKey Keyboard] on usb-ci_hdrc.1-1.2/input0 systemd-logind[418]: Watching system buttons on /dev/input/event6 (Dell Dell QuietKey Keyboard) weston[486]: [11:35:16.511] event6 - Dell Dell QuietKey Keyboard: is tagged by udev as: Keyboard weston[486]: [11:35:16.511] event6 - Dell Dell QuietKey Keyboard: device is a keyboard weston[486]: [11:35:16.513] libinput: configuring device "Dell Dell QuietKey Keyboard". weston[486]: [11:35:16.513] associating input device event6 with output HDMI-A-1 (none by udev) kernel: [ 129.506479] usb 2-1.2: USB disconnect, device number 17 weston[486]: [11:35:18.775] event6 - Dell Dell QuietKey Keyboard: device removed --> Attach a KVM switch into host port and then disconnect it. kernel: [ 160.369756] usb 2-1.2: new high-speed USB device number 18 using ci_hdrc kernel: [ 160.622949] hub 2-1.2:1.0: USB hub found kernel: [ 160.623495] hub 2-1.2:1.0: 4 ports detected kernel: [ 163.298449] usb 2-1.2: USB disconnect, device number 18 --> Attach a KVM switch into host port, attach a mouse into the KVM and then disconnect it. kernel: [ 184.939760] usb 2-1.2: new high-speed USB device number 19 using ci_hdrc kernel: [ 185.195174] hub 2-1.2:1.0: USB hub found kernel: [ 185.195706] hub 2-1.2:1.0: 4 ports detected kernel: [ 190.249755] usb 2-1.2.2: new low-speed USB device number 20 using ci_hdrc kernel: [ 190.416307] input: Logitech USB Optical Mouse as /devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-1/2-1.2/2-1.2.2/2-1.2.2:1.0/0003:046D:C05F.0008/input/input9 kernel: [ 190.417250] hid-generic 0003:046D:C05F.0008: input: USB HID v1.11 Mouse [Logitech USB Optical Mouse] on usb-ci_hdrc.1-1.2.2/input0 weston[486]: [11:36:19.907] event6 - Logitech USB Optical Mouse: is tagged by udev as: Mouse weston[486]: [11:36:19.907] event6 - Logitech USB Optical Mouse: device is a pointer weston[486]: [11:36:19.908] libinput: configuring device "Logitech USB Optical Mouse". weston[486]: [11:36:19.908] associating input device event6 with output HDMI-A-1 (none by udev) kernel: [ 193.531312] usb 2-1.2.2: USB disconnect, device number 20 weston[486]: [11:36:22.721] event6 - Logitech USB Optical Mouse: device removed --> Re-attach the mouse into the KVM and then disconnect the KVM switch. kernel: [ 208.169755] usb 2-1.2.2: new low-speed USB device number 21 using ci_hdrc kernel: [ 208.333289] input: Logitech USB Optical Mouse as /devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-1/2-1.2/2-1.2.2/2-1.2.2:1.0/0003:046D:C05F.0009/input/input10 kernel: [ 208.335566] hid-generic 0003:046D:C05F.0009: input: USB HID v1.11 Mouse [Logitech USB Optical Mouse] on usb-ci_hdrc.1-1.2.2/input0 weston[486]: [11:36:37.805] event6 - Logitech USB Optical Mouse: is tagged by udev as: Mouse weston[486]: [11:36:37.806] event6 - Logitech USB Optical Mouse: device is a pointer weston[486]: [11:36:37.806] libinput: configuring device "Logitech USB Optical Mouse". weston[486]: [11:36:37.806] associating input device event6 with output HDMI-A-1 (none by udev) kernel: [ 211.426306] usb 2-1.2: USB disconnect, device number 19 kernel: [ 211.426317] usb 2-1.2.2: USB disconnect, device number 21 weston[486]: [11:36:40.616] event6 - Logitech USB Optical Mouse: device removed --> Attach a KVM switch into host port, attach a keyboard into the KVM and then disconnect it. kernel: [ 230.249761] usb 2-1.2: new high-speed USB device number 22 using ci_hdrc kernel: [ 230.502823] hub 2-1.2:1.0: USB hub found kernel: [ 230.503332] hub 2-1.2:1.0: 4 ports detected kernel: [ 237.349770] usb 2-1.2.2: new low-speed USB device number 23 using ci_hdrc kernel: [ 237.516824] input: Dell Dell QuietKey Keyboard as /devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-1/2-1.2/2-1.2.2/2-1.2.2:1.0/0003:413C:2106.000A/input/input11 kernel: [ 237.580297] hid-generic 0003:413C:2106.000A: input: USB HID v1.10 Keyboard [Dell Dell QuietKey Keyboard] on usb-ci_hdrc.1-1.2.2/input0 systemd-logind[418]: Watching system buttons on /dev/input/event6 (Dell Dell QuietKey Keyboard) weston[486]: [11:37:06.967] event6 - Dell Dell QuietKey Keyboard: is tagged by udev as: Keyboard weston[486]: [11:37:06.969] event6 - Dell Dell QuietKey Keyboard: device is a keyboard weston[486]: [11:37:06.971] libinput: configuring device "Dell Dell QuietKey Keyboard". weston[486]: [11:37:06.972] associating input device event6 with output HDMI-A-1 (none by udev) kernel: [ 240.637437] usb 2-1.2.2: USB disconnect, device number 23 weston[486]: [11:37:09.897] event6 - Dell Dell QuietKey Keyboard: device removed --> Re-attach the keyboard into the KVM and then disconnect the KVM switch. kernel: [ 257.319980] usb 2-1.2.2: new low-speed USB device number 24 using ci_hdrc kernel: [ 257.483579] input: Dell Dell QuietKey Keyboard as /devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-1/2-1.2/2-1.2.2/2-1.2.2:1.0/0003:413C:2106.000B/input/input12 kernel: [ 257.560285] hid-generic 0003:413C:2106.000B: input: USB HID v1.10 Keyboard [Dell Dell QuietKey Keyboard] on usb-ci_hdrc.1-1.2.2/input0 systemd-logind[418]: Watching system buttons on /dev/input/event6 (Dell Dell QuietKey Keyboard) weston[486]: [11:37:26.926] event6 - Dell Dell QuietKey Keyboard: is tagged by udev as: Keyboard weston[486]: [11:37:26.928] event6 - Dell Dell QuietKey Keyboard: device is a keyboard weston[486]: [11:37:26.930] libinput: configuring device "Dell Dell QuietKey Keyboard". weston[486]: [11:37:26.931] associating input device event6 with output HDMI-A-1 (none by udev) kernel: [ 260.323187] usb 2-1.2: USB disconnect, device number 22 kernel: [ 260.323199] usb 2-1.2.2: USB disconnect, device number 24 weston[486]: [11:37:29.585] event6 - Dell Dell QuietKey Keyboard: device removed --> Attach a KVM switch into host port, attach a mouse and a keyboard into the KVM and then disconnect the KVM switch. kernel: [ 282.479747] usb 2-1.2: new high-speed USB device number 25 using ci_hdrc kernel: [ 282.732817] hub 2-1.2:1.0: USB hub found kernel: [ 282.733327] hub 2-1.2:1.0: 4 ports detected kernel: [ 288.299751] usb 2-1.2.2: new low-speed USB device number 26 using ci_hdrc kernel: [ 288.476005] input: Logitech USB Optical Mouse as /devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-1/2-1.2/2-1.2.2/2-1.2.2:1.0/0003:046D:C05F.000C/input/input13 kernel: [ 288.476222] hid-generic 0003:046D:C05F.000C: input: USB HID v1.11 Mouse [Logitech USB Optical Mouse] on usb-ci_hdrc.1-1.2.2/input0 weston[486]: [11:37:57.956] event6 - Logitech USB Optical Mouse: is tagged by udev as: Mouse weston[486]: [11:37:57.956] event6 - Logitech USB Optical Mouse: device is a pointer weston[486]: [11:37:57.957] libinput: configuring device "Logitech USB Optical Mouse". weston[486]: [11:37:57.957] associating input device event6 with output HDMI-A-1 (none by udev) kernel: [ 291.629751] usb 2-1.2.4: new low-speed USB device number 27 using ci_hdrc kernel: [ 291.793640] input: Dell Dell QuietKey Keyboard as /devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-1/2-1.2/2-1.2.4/2-1.2.4:1.0/0003:413C:2106.000D/input/input14 kernel: [ 291.860657] hid-generic 0003:413C:2106.000D: input: USB HID v1.10 Keyboard [Dell Dell QuietKey Keyboard] on usb-ci_hdrc.1-1.2.4/input0 systemd-logind[418]: Watching system buttons on /dev/input/event7 (Dell Dell QuietKey Keyboard) weston[486]: [11:38:01.238] event7 - Dell Dell QuietKey Keyboard: is tagged by udev as: Keyboard weston[486]: [11:38:01.242] event7 - Dell Dell QuietKey Keyboard: device is a keyboard weston[486]: [11:38:01.243] libinput: configuring device "Dell Dell QuietKey Keyboard". weston[486]: [11:38:01.243] associating input device event7 with output HDMI-A-1 (none by udev) kernel: [ 295.394440] usb 2-1.2: USB disconnect, device number 25 kernel: [ 295.394450] usb 2-1.2.2: USB disconnect, device number 26 weston[486]: [11:38:04.580] event6 - Logitech USB Optical Mouse: device removed kernel: [ 295.431931] usb 2-1.2.4: USB disconnect, device number 27 weston[486]: [11:38:04.725] event7 - Dell Dell QuietKey Keyboard: device removed --> End test. --- drivers/usb/host/ehci-q.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c index 3276304..da7fd12 100644 --- a/drivers/usb/host/ehci-q.c +++ b/drivers/usb/host/ehci-q.c @@ -206,8 +206,9 @@ static int qtd_copy_status ( if (token & QTD_STS_BABBLE) { /* FIXME "must" disable babbling device's port too */ status = -EOVERFLOW; - /* CERR nonzero + halt --> stall */ - } else if (QTD_CERR(token)) { + /* CERR nonzero and less than EHCI_TUNE_CERR + halt --> stall. + This handles situation where stall comes after an error. */ + } else if (QTD_CERR(token) && QTD_CERR(token) < EHCI_TUNE_CERR) { status = -EPIPE; /* In theory, more than one of the following bits can be set @@ -228,6 +229,10 @@ static int qtd_copy_status ( usb_pipeendpoint(urb->pipe), usb_pipein(urb->pipe) ? "in" : "out"); status = -EPROTO; + /* CERR equals EHCI_TUNE_CERR, no other errors + halt --> stall. + This handles situation where stall comes without error bits set. */ + } else if (QTD_CERR(token)) { + status = -EPIPE; } else { /* unknown */ status = -EPROTO; } -- 2.7.4
