Oops with IrDA in 2.6.15-23-686

I don't know exactly how this should be investigated further, because i am not using IrDA. I just happened to notice this while reading dmesg.

This does NOT happen with 2.6.15-22-686.

The essential lines from dmesg:

Linux version 2.6.15-23-686 (buildd@rothera) (gcc version 4.0.3 (Ubuntu 4.0.3-1ubuntu5)) #1 SMP PREEMPT Tue May 23 14:03:07 UTC 2006
irda_init()
NET: Registered protocol family 23
**** SET: Misaligned resource pointer: db5ecc42 Type 00 Len 42
**** SET: Misaligned resource pointer: db5eccc6 Type 07 Len 0
pnp: Device 00:0b activated.
nsc_ircc_pnp_probe() : Found cfg_base 0x000 ; firbase 0x2F8 ; irq 3 ; dma 1.
nsc-ircc, Found chip at base=0x000
nsc-ircc, driver loaded (Dag Brattli)
IrDA: Registered device irda0
nsc-ircc, Found dongle: HP HSDL-1100/HSDL-2100
nsc-ircc, Found chip at base=0x02e
nsc-ircc, driver loaded (Dag Brattli)
nsc_ircc_open(), can't get iobase of 0x2f8
Unable to handle kernel NULL pointer dereference at virtual address 00000004
printing eip:
c013c886
*pde = 00000000
Oops: 0002 [#1]
PREEMPT SMP
Modules linked in: pcmcia irtty_sir sir_dev nsc_ircc irda tsdev floppy crc_ccitt parport_pc parport yenta_socket rsrc_nonstatic pcmcia_core ltserial ltmodem psmouse serio_raw snd_intel8x0 snd_ac97_codec snd_ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm snd_timer e100 mii snd soundcore snd_page_alloc pcspkr hw_random shpchp pci_hotplug intel_agp agpgart evdev ext3 jbd ide_generic uhci_hcd usbcore ide_cd cdrom ide_disk piix generic thermal processor fan fbcon tileblit font bitblit softcursor capability commoncap
CPU: 0
EIP: 0060:[<c013c886>] Tainted: P VLI
EFLAGS: 00010092 (2.6.15-23-686)
EIP is at finish_wait+0x36/0x70
eax: 00000202 ebx: dbd07fd8 ecx: 00000000 edx: 00000000
esi: dbd07fcc edi: e0a562a8 ebp: 00000000 esp: dbd07fb4
ds: 007b es: 007b ss: 0068
Process kIrDAd (pid: 3157, threadinfo=dbd06000 task=da867050)
Stack: dbd06000 dbd07fcc 00000000 e0a52b83 e0a53b20 00000000 00000000 da867050
c011f4e0 00000000 00000000 e0a52ae0 00000000 c0101525 dab29f74 00000000
00000000 00000000 00000000
Call Trace:
[<e0a52b83>] irda_thread+0xa3/0xe0 [sir_dev]
[<c011f4e0>] default_wake_function+0x0/0x20
[<e0a52ae0>] irda_thread+0x0/0xe0 [sir_dev]
[<c0101525>] kernel_thread_helper+0x5/0x10
Code: 24 04 89 d6 89 7c 24 08 89 c7 b8 00 e0 ff ff 21 e0 8b 00 c7 00 00 00 00 00 3b 5a 0c 74 2f 89 f8 e8 a0 fe 1c 00 8b 53 04 8b 4e 0c <89> 51 04 89 0a 89 c2 89 f8 89 5e 0c 89 5b 04 8b 1c 24 8b 74 24
<6>note: kIrDAd[3157] exited with preempt_count 1

When running 2.6.15-22-686:

Linux version 2.6.15-22-686 (buildd@vernadsky) (gcc version 4.0.3 (Ubuntu 4.0.3-1ubuntu5)) #1 SMP PREEMPT Sun May 7 16:37:57 UTC 2006
irda_init()
NET: Registered protocol family 23
**** SET: Misaligned resource pointer: dbcbf242 Type 00 Len 42
**** SET: Misaligned resource pointer: dbcbf2c6 Type 07 Len 0
pnp: Device 00:0b activated.
nsc_ircc_pnp_probe() : Found cfg_base 0x000 ; firbase 0x2F8 ; irq 3 ; dma 1.
nsc-ircc, Found chip at base=0x000
nsc-ircc, driver loaded (Dag Brattli)
IrDA: Registered device irda0
nsc-ircc, Found dongle: HP HSDL-1100/HSDL-2100
nsc-ircc, Found chip at base=0x02e
nsc-ircc, driver loaded (Dag Brattli)
nsc_ircc_open(), can't get iobase of 0x2f8