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[Spca50x-devs] "Fatal exception in interrupt" with Multiple SPC300NC Cams

Hi,

First thanks so much for providing a module with such a wide-range
webcam support. But I've some problems with the stability of the
software.

I've been trying to use your spca5xx kernel module for a project of the
company, but I'm having some real trouble in here while trying to use
multiple (actually 2) Philips spc300nc webcams concurrently. Here's the
related kernel panic screen:

invalid opcode: 0000 [#1]
PREEMPT
Modules linked in: spca5xx videodev
CPU:    0
EIP:    0060:[<c011ad25>]      Not tainted VLI
EFLAGS: 00010246      (2.6.17.1   #9)
EIP is at tasklet_action+0x2d/0x54
eax: 00000000  ebx: cb090008  ecx: 0000000b  edx: cb090008
esi: c03ed348  edi: 0000000a  ebp: 0042a007   esp: c03b9f8c
ds: 007b   es: 007b  ss: 0068
Process swapper (pid: 0, threadinfo=c03b8000 task=c035e400)
Stack: 00000001 c011ab23 c03ed348 00000046 00099100 c03af800 c011ab59 c03b8000
       c011ac05 c0104e7e c0103842 c03b8000 c035e400 c03b8000 00099199 c03af800
       0042a007 00000000 c035007b c035007b ffffff05 c0100b15 00000060 00000246
Call Trace:
 <c011ab23> __do_softirq+0x77/0x84  <c011ab59> do_softirq+0x29/0x2c
 <c011ac05> irq_exit+0x35/0x38  <c0104e7e> do_IRQ+0x1e/0x24
 <c0103842> common_interrupt+0x1a/0x20  <c0100b15> default_idle+0x25/0x54
 <c01100b91> cpu_idle+0x49/0x60  <c03ba670> start_kernel+0x158/0x16c
Code: 8b 1d 00 d3 3e c0 c7 05 00 d3 3e c0 00 00 00 00 fb 85 db 74 23 90 89 da 8b
 42 08 85 c0 8b 1b 75 19 9f b3 42 04 19 c0 85 c0 75 02 <0f> 0b ff 72 10 ff 52 0c
 528 85 db 75 de 5b c3 fa a1 00 d3 3e c0
EIP: [<c011ad25>] tasklet_action+0x2d/0x54 SS:ESP 0068:c03b9f8c
 <0>Kernel panic - not syncing: Fatal exception in interrupt

I'm using kernel 2.6.17.1 and here's my .config file:
http://www.students.itu.edu.tr/~yazicivo/config.txt (Yes, in this config
file, kernel is not preemptible despite above output is; that's because
that I've tried both a preempt and a non-preempt kernel, but the results
were same: kernel panic.)

Also this problem occurs again when I try a spc200nc, spc300nc
combination too.

I'd be very appreciated if you can urgently help me to fix this problem.
Please just tell me if you need any further information. (At least, it'll
be welcome if you can suggest any webcam model working stable when used
concurrently.)

Regards.

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