On Thu, Oct 16, 2014 at 7:39 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote:
> On Thu, 16 Oct 2014, Naveen Kumar Parna wrote:
>
>> > Indeed. However, it is possible to use an additional in between your
>> > devices and the internal hub.
>> >
>> > Regards
>> > Oliver
>> >
>> >
>>
>>
>> Tested with this configuration(external hubs Dev 3, Dev 4, Dev 17, Dev
>> 10) and got the same result.
>>
>> /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
>>
>> /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
>>
>> |__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/6p, 480M
>>
>> |__ Port 5: Dev 3, If 0, Class=hub, Driver=hub/7p, 12M
>>
>> |__ Port 1: Dev 4, If 0, Class=hub, Driver=hub/7p, 12M
>
> This is not what Oliver meant. You have to use a USB-2 hub. And
> having one of them is enough; you don't need two.
>
> Alan Stern
>
As suggested, I connected USB-2 hub(Dev 87) in between my devices and
the internal hub. In this scenario also observed the STALL packets.
I am interested in understanding the objective of this test, can you
please help me?
[lowerlayers@banunxcas29 ~]$ lsusb -t
1-1.5.1:1.2: No such file or directory
1-1.5.3:1.2: No such file or directory
1-1.5.4:1.2: No such file or directory
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
|__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/6p, 480M
|__ Port 5: Dev 87, If 0, Class=hub, Driver=hub/4p, 480M
|__ Port 1: Dev 88, If 0, Class='bInterfaceClass 0xe0 not
yet handled', Driver=btusb, 12M
|__ Port 1: Dev 88, If 1, Class='bInterfaceClass 0xe0 not
yet handled', Driver=btusb, 12M
|__ Port 1: Dev 88, If 2, Class=app., Driver=, 12M
|__ Port 3: Dev 90, If 0, Class='bInterfaceClass 0xe0 not
yet handled', Driver=btusb, 12M
|__ Port 3: Dev 90, If 1, Class='bInterfaceClass 0xe0 not
yet handled', Driver=btusb, 12M
|__ Port 3: Dev 90, If 2, Class=app., Driver=, 12M
|__ Port 4: Dev 89, If 0, Class='bInterfaceClass 0xe0 not
yet handled', Driver=btusb, 12M
|__ Port 4: Dev 89, If 1, Class='bInterfaceClass 0xe0 not
yet handled', Driver=btusb, 12M
|__ Port 4: Dev 89, If 2, Class=app., Driver=, 12M
[root@banunxcas29 ~]# cat /sys/kernel/debug/usb/usbmon/1u
ffff8800b2036540 2419900733 C Ii:1:090:1 -32:1 0
ffff8800b2036540 2419900753 S Ii:1:090:1 -115:1 16 <
ffff8800b2036540 963424773 C Ii:1:090:1 -32:1 0
ffff8800b2036540 963424792 S Ii:1:090:1 -115:1 16 <
ffff8800b2036540 963448864 C Ii:1:090:1 -32:1 0
ffff8800b2036540 963448880 S Ii:1:090:1 -115:1 16 <
/var/log/kernel
Oct 27 13:21:15 banunxcas29 kernel: [1017571.251514] hci2 urb
ffff8800b2036540 status -32 count 0
Oct 27 14:05:15 banunxcas29 kernel: [1020211.003086] hci2 urb
ffff8800b2036540 status -32 count 0
Oct 27 14:05:15 banunxcas29 kernel: [1020211.027178] hci2 urb
ffff8800b2036540 status -32 count 0
Thanks,
Naveen
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