On 12.01.2017 15:33, Christoph Anton Mitterer wrote:
Hi. This is basically from: https://bugzilla.kernel.org/show_bug.cgi?id=108341 respectively https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=805903 the later in which Ben Hutchings recommended me to ping this list as well. I bought a USB3.0 ExpressCard from StarTech[0] which is apparently[1] based on the NEC uPD720200. Using a kernel 4.2.6 (see further below for the same on a more recent kernel version) on amd64, the System is Debian sid, the following happens when I plug the card: kernel logs show: Nov 21 17:15:22 heisenberg kernel: [ 102.387452] pci 0000:01:00.0: [1033:0194] type 00 class 0x0c0330 Nov 21 17:15:22 heisenberg kernel: [ 102.387545] pci 0000:01:00.0: reg 0x10: [mem0x00000000-0x00001fff 64bit] Nov 21 17:15:22 heisenberg kernel: [ 102.387723] pci 0000:01:00.0: PME# supported from D0 D3hot Nov 21 17:15:22 heisenberg kernel: [ 102.394689] pci 0000:01:00.0: BAR 0: assigned [mem0xf0d00000-0xf0d01fff 64bit] Nov 21 17:15:22 heisenberg kernel: [ 102.394750] pci 0000:01:00.0: enabling device (0000 -> 0002) Nov 21 17:15:22 heisenberg kernel: [ 102.395178] xhci_hcd 0000:01:00.0: xHCI Host Controller Nov 21 17:15:22 heisenberg kernel: [ 102.395192] xhci_hcd 0000:01:00.0: new USB bus registered,assigned bus number 5 Nov 21 17:15:22 heisenberg kernel: [ 102.395418] xhci_hcd 0000:01:00.0: hcc params 0x014042cb hciversion 0x96 quirks 0x00000004 Nov 21 17:15:22 heisenberg kernel: [ 102.395892] usb usb5: New USB device found, idVendor=1d6b, idProduct=0002 Nov 21 17:15:22 heisenberg kernel: [ 102.395896] usb usb5: New USB device strings: Mfr=3, Product=2, SerialNumber=1 Nov 21 17:15:22 heisenberg kernel: [ 102.395899] usb usb5: Product: xHCI Host Controller Nov 21 17:15:22 heisenberg kernel: [ 102.395902] usb usb5: Manufacturer: Linux 4.2.0-1-amd64 xhci-hcd Nov 21 17:15:22 heisenberg kernel: [ 102.395905] usb usb5: SerialNumber: 0000:01:00.0 Nov 21 17:15:22 heisenberg kernel: [ 102.396308] hub 5-0:1.0: USB hub found Nov 21 17:15:22 heisenberg kernel: [ 102.396331] hub 5-0:1.0: 2 ports detected Nov 21 17:15:22 heisenberg kernel: [ 102.396591] xhci_hcd 0000:01:00.0: xHCI Host Controller Nov 21 17:15:22 heisenberg kernel: [ 102.396599] xhci_hcd 0000:01:00.0: new USB bus registered,assigned bus number 6 Nov 21 17:15:22 heisenberg kernel: [ 102.398835] usb usb6: We don't know the algorithms for LPM forthis host, disabling LPM. Nov 21 17:15:22 heisenberg kernel: [ 102.398883] usb usb6: New USB device found, idVendor=1d6b, idProduct=0003 Nov 21 17:15:22 heisenberg kernel: [ 102.398887] usb usb6: New USB device strings: Mfr=3, Product=2, SerialNumber=1 Nov 21 17:15:22 heisenberg kernel: [ 102.398890] usb usb6: Product: xHCI Host Controller Nov 21 17:15:22 heisenberg kernel: [ 102.398892] usb usb6: Manufacturer: Linux 4.2.0-1-amd64 xhci-hcd Nov 21 17:15:22 heisenberg kernel: [ 102.398895] usb usb6: SerialNumber: 0000:01:00.0 Nov 21 17:15:22 heisenberg kernel: [ 102.399272] hub 6-0:1.0: USB hub found Nov 21 17:15:22 heisenberg kernel: [ 102.399294] hub 6-0:1.0: 2 ports detected and when removing: Nov 21 17:15:40 heisenberg kernel: [ 120.541515] xhci_hcd 0000:01:00.0: remove, state 4 Nov 21 17:15:40 heisenberg kernel: [ 120.544671] usb usb6: USB disconnect, device number 1 Nov 21 17:15:40 heisenberg kernel: [ 120.546683] xhci_hcd 0000:01:00.0: Host not halted after 16000 microseconds. Nov 21 17:15:40 heisenberg kernel: [ 120.547611] xhci_hcd 0000:01:00.0: USB bus 6 deregistered Nov 21 17:15:40 heisenberg kernel: [ 120.547618] xhci_hcd 0000:01:00.0: remove, state 4 Nov 21 17:15:40 heisenberg kernel: [ 120.547622] usb usb5: USB disconnect, device number 1 Nov 21 17:15:40 heisenberg kernel: [ 120.547735] xhci_hcd 0000:01:00.0: USB bus 5 deregistered Now the problem is that immediately when I attach the card, a kworker process starts to utilise the CPU to always around 72%. And it never stops again until I shutdown; removing the card doesn't help.
Does this kworker start to utilize the CPU immediately after a fresh boot when the card is inserted, or only after the first card removal? If after first removal then it could be related to this: https://www.spinics.net/lists/stable/msg155829.html -Mathias -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
