ALSA bugs with 2.6.12-rc1

[David Ford <david+challenge-response@blue-labs.org>]

It seems that 2.6.12-rc1 introduced an ALSA bug generating an oops for a 
null pointer.

codec_semaphore: semaphore is not ready [0x1][0x300300]
codec_read 0: semaphore is not ready for register 0x2c
Unable to handle kernel NULL pointer dereference at virtual address 00000000
printing eip:
c01d7746
*pde = 00000000
Oops: 0002 [#1]
PREEMPT
Modules linked in: orinoco_cs orinoco hermes pcmcia yenta_socket 
rsrc_nonstatic pcmcia_core vfat fat nls_base i2c_sensor i2c_core eth1394 
ohci1394 ieee1394 i8k
CPU:    0
EIP:    0060:[<c01d7746>]    Not tainted VLI
EFLAGS: 00010202   (2.6.12-rc1)
EIP is at memcpy+0x1e/0x39
eax: 00000010   ebx: e7608180   ecx: 00000004   edx: 00000000
esi: e13d1ee4   edi: 00000000   ebp: bf924390   esp: e13d1eb4
ds: 007b   es: 007b   ss: 0068
Process artsd (pid: 11880, threadinfo=e13d1000 task=e1436590)
Stack: ffffffea ffffffea e13d1ef4 c02b8793 00000000 e13d1ee4 00000010 
e7608180
      c02b954d e7608180 e13d1ee4 00000050 00000006 00000000 00000000 
00000000
      00000005 00000001 00000000 00000000 00008002 00000000 00000000 
00000000
Call Trace:
[<c02b8793>] snd_timer_user_append_to_tqueue+0x40/0x49
[<c02b954d>] snd_timer_user_params+0x236/0x245
[<c016f152>] do_ioctl+0x9a/0xa9
[<c016f2ef>] vfs_ioctl+0x65/0x1e1
[<c015bc34>] get_unused_fd+0x2c/0xd2
[<c016f4b0>] sys_ioctl+0x45/0x6d
[<c0102f87>] sysenter_past_esp+0x54/0x75
Code: fd 31 c0 c3 31 d2 b8 f2 ff ff ff c3 90 83 ec 0c 8b 44 24 18 8b 54 
24 10 89 74 24 04 89 c1 89 7c 24 08 8b 74 24 14 c1 e9 02 89 d7 <f3> a5 
a8 02 74 02 66 a5 a8 01 74 01 a4 89 d0 8b 74 24 04 8b 7c
codec_semaphore: semaphore is not ready [0x1][0x300300]
codec_read 1: semaphore is not ready for register 0x54
codec_semaphore: semaphore is not ready [0x1][0x300300]
codec_write 1: semaphore is not ready for register 0x54


This happens on multiple machines, 32b and 64bit.  I'll be happy to 
provide further information if needed.

-david

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