[ILUG] USB Hubs and GSM Modems (again!!!)

[Mick]

How is everyone? 
I'm looking for some help with the following problem ...
I'm working away on an issue with GSM modems connected via a Serial to USB
cable to a 7 port Belkin hub.
When I connect one of the GSM modems I'm told that usbserial.c: PL-2303
converter now attached to ttyUSB0. When I run the following command 
	
	rm /dev/modem ; ln -s /dev/ttyUSB0 /dev/modem ; minicom 

I can connect to the modem without any difficulty and issue at commands to
it.

I then go to connect the second modem to the hub and get the message as
listed below. I'm having a lot of trouble getting all of these modems up and
running and any help that anyone can give me would be sincerely grateful.

Thanks in advance,

Mick


usbserial.c: PL-2303 converter now attached to ttyUSB1 (or usb/tts/1 for
devfs)
usb.c: serial driver claimed interface c292fde0
hub.c: port 3, portstatus 100, change 0, 12 Mb/s
hub.c: port 4, portstatus 100, change 0, 12 Mb/s
hub.c: port 5, portstatus 100, change 0, 12 Mb/s
hub.c: port 6, portstatus 100, change 0, 12 Mb/s
hub.c: port 7, portstatus 100, change 0, 12 Mb/s
Unable to handle kernel NULL pointer dereference at virtual address 00000014
 printing eip:
c01cf9f4
*pde = 00000000
Oops: 0000
CPU:    0
EIP:    0010:[<c01cf9f4>]    Not tainted
EFLAGS: 00010006
eax: c11e4600   ebx: c3aad820   ecx: 00000001   edx: 00000000
esi: c11fb360   edi: c3aad820   ebp: 00000292   esp: c3807e80
ds: 0018   es: 0018   ss: 0018
Process minicom (pid: 801, stackpage=c3807000)
Stack: c3aad820 c11fb360 00000286 c3aad824 c01d078b c3aad820 c3aad820
00000000
       c11b924c 00000000 c237281c c2372874 00000001 c01c700d c3aad820
c487c480
       c3aad820 c487d20d 00000001 c237281c c2aa6000 c01d24b7 c237281c
c03f18c0
Call Trace: [<c01d078b>] [<c01c700d>] [<c487c480>] [<c487d20d>]
[<c01d24b7>][<c01d2575>] [<c0185f6f>] [<c015a060>] [<c0149d31>] 
[<c018636f>] [<c0136d3c>][<c01353cd>] [<c013544e>] [<c010737b>]

Code: 8b 52 14 83 ea 1c 8b 42 04 8b 5a 08 25 00 00 00 2f 0d 00 00