Re: Random Interface numbers

On Thu, 30 Aug 2007, Pete Zaitcev wrote:

> A user reported a bug here:
>  https://bugzilla.redhat.com/show_bug.cgi?id=270081
> 
> It has two parts:
>  - Device is not reliable overall
>  - When it works, it reports strange interface numbers
> 
> T:  Bus=02 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#=  8 Spd=1.5 MxCh= 0
> D:  Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
> P:  Vendor=1267 ProdID=0210 Rev= 0.01
> S:  Product=PS/2+USB Mouse
> C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=100mA
> I:* If#= 1 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=01 Prot=02 Driver=usbhid
> E:  Ad=81(I) Atr=03(Int.) MxPS=   8 Ivl=10ms
> 
> usb 2-1: new low speed USB device using uhci_hcd and address 8
> usb 2-1: config 1 has an invalid interface number: 1 but max is 0
> usb 2-1: config 1 has no interface number 0
> usb 2-1: configuration #1 chosen from 1 choice
> input: PS/2+USB Mouse as /class/input/input8
> input: USB HID v1.00 Mouse [PS/2+USB Mouse] on usb-0000:00:1d.1-1
> 
> I don't get it, why is max zero in this case?

In any configuration, the interface numbers must run from 0 to 
bNumInterfaces - 1.  Hence if there is only one interface, its number 
must be 0.

Alan Stern


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