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Subjectcs46xx oops in 2.4.5-ac4

Since upgrading to 2.4.5-ac4 the Crystal Soundfusion card in my Thinkpad 600X
has stopped working. Trying to play an audio file (with /usr/bin/play from sox
12.16) gives me an oops. Here is the init stuff from dmesg for the sound card:

Crystal 4280/46xx + AC97 Audio, version 1.27.32, 13:05:58 May 29 2001
cs46xx: Card found at 0x50100000 and 0x50000000, IRQ 11
cs46xx: Thinkpad 600X/A20/T20 (1014:0153) at 0x50100000/0x50000000, IRQ 11
ac97_codec: AC97 Audio codec, id: 0x4352:0x5913 (Cirrus Logic CS4297A rev A)

And here is the oops info from ksymoops (apologies if my email program wraps any
lines; I intend to start using a decent mail program Real Soon Now):

ksymoops 2.4.1 on i686 2.4.5-ac4. Options used
-v /usr/src/linux-2.4.5-ac4/vmlinux (specified)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.4.5-ac4/ (default)
-m /usr/src/linux/ (default)

Unable to handle kernel NULL pointer dereference at virtual address 00000000
*pde = 00000000
Oops: 0002
CPU: 0
EIP: 0010:[<c0111f34>]
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010086
eax: ccf7d884 ebx: 00000000 ecx: 00000286 edx: cca43f2c
esi: cca43f24 edi: ccf7d880 ebp: cca43f24 esp: cca43f08
ds: 0018 es: 0018 ss: 0018
Process sox (pid: 186, stackpage=cca43000)
Stack: ccf7d878 cca42000 c0105938 ffffffea cdcf7a20 00001000 ccf7d7f0 00000001
cca42000 ccf7d884 00000000 c0105aa8 ccf7d878 ccf7d7c0 cdcf7a40 d0c75678
ffffffea cdcf7a20 00001000 bffff870 00000000 ccf7d7f0 00000001 00000018
Call Trace: [<c0105938>] [<c0105aa8>] [<d0c75678>] [<c01225cb>] [<c012dd66>]
Code: 89 13 51 9d 5b 5e c3 90 9c 58 fa 8b 4a 0c 8b 52 08 89 4a 04

>>EIP; c0111f34 <add_wait_queue_exclusive+1c/24> <=====
Trace; c0105938 <__down+4c/a8>
Trace; c0105aa8 <__down_failed+8/c>
Trace; d0c75678 <[cs46xx].text.end+74/1dc>
Trace; c01225cb <generic_file_read+63/80>
Trace; c012dd66 <sys_write+8e/c4>
Trace; c0106b27 <system_call+33/38>
Code; c0111f34 <add_wait_queue_exclusive+1c/24>
00000000 <_EIP>:
Code; c0111f34 <add_wait_queue_exclusive+1c/24> <=====
0: 89 13 mov %edx,(%ebx) <=====
Code; c0111f36 <add_wait_queue_exclusive+1e/24>
2: 51 push %ecx
Code; c0111f37 <add_wait_queue_exclusive+1f/24>
3: 9d popf
Code; c0111f38 <add_wait_queue_exclusive+20/24>
4: 5b pop %ebx
Code; c0111f39 <add_wait_queue_exclusive+21/24>
5: 5e pop %esi
Code; c0111f3a <add_wait_queue_exclusive+22/24>
6: c3 ret
Code; c0111f3b <add_wait_queue_exclusive+23/24>
7: 90 nop
Code; c0111f3c <remove_wait_queue+0/14>
8: 9c pushf
Code; c0111f3d <remove_wait_queue+1/14>
9: 58 pop %eax
Code; c0111f3e <remove_wait_queue+2/14>
a: fa cli
Code; c0111f3f <remove_wait_queue+3/14>
b: 8b 4a 0c mov 0xc(%edx),%ecx
Code; c0111f42 <remove_wait_queue+6/14>
e: 8b 52 08 mov 0x8(%edx),%edx
Code; c0111f45 <remove_wait_queue+9/14>
11: 89 4a 04 mov %ecx,0x4(%edx)

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