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

[Robert Fitzsimons]

Hello Mick

Did you get this issue resolved?  I'm wondering if it's a power problem,
are the GSM modems powered by the USB hub?  If so maybe the hub can't
provide enough power for all of the modems.  You could try plugging in
another hub in and putting half the modems into this new hub.

Robert

On Tue, Dec 12, 2006 at 01:27:42PM -0000, Mick wrote:
> 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
> 
> 
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