[2.6.8 bugreport] using mmap with via82cxxx_audio causes GPF

["Vladimir Chernyshov" <greengrass@writeme.com> (by way of Gustavo Guillermo Perez <gustavo@compunauta.com>)]

Hi,

Setting up mmap before setting up speed/format/channels causes shortly
 afterwards a general protection fault in via82cxxx_audio:

===========================================================================
CPU 0
Modules linked in: snd_via82xx snd_ac97_codec snd_pcm snd_timer
 snd_page_alloc gameport snd_mpu401_uart snd_rawmidi snd_seq_device snd
 ehci_hcd uhci_hcd eth1394 via82cxxx_audio uart401 sound soundcore ac97_codec
 via82cxxx ide_core r8169 crc32 ohci1394 nls_iso8859_1 nls_cp437 capability
 commoncap sr_mod cdrom sbp2 ieee1394 rtc vfat fat ext2 ext3 jbd mbcache
 sd_mod sata_via libata scsi_mod unix font vesafb cfbcopyarea cfbimgblt
 cfbfill rect
Pid: 2023, comm: quake-x11 Not tainted 2.6.8-9-amd64-k8
RIP: 0010:[<ffffffffa019666e>]
 <ffffffffa019666e>{:via82cxxx_audio:via_mm_nopage+350} RSP:
 0000:000001001e987d78  EFLAGS: 00010206
RAX: 038000fc81000000 RBX: 000001001e873858 RCX: 0000000000000020
RDX: 006fffff90000000 RSI: 0000000055fbd000 RDI: 000001001e72a290
RBP: 000001001e873800 R08: 000001001f528de8 R09: 000001001e98f578
R10: 0000000000000000 R11: 0000000000000000 R12: 000001001e873858
R13: 0000000000000000 R14: 000001001e987dcc R15: 000001001e4fb480
FS:  0000000000000000(0000) GS:ffffffff80387980(005b) knlGS:00000000557aa080
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000055fbd000 CR3: 0000000000101000 CR4: 00000000000006e0
Process quake-x11 (pid: 2023, threadinfo 000001001e986000, task
 000001001ec1d350) Stack: 0000000000000000 0000000000000001 0000010012e41240
 000001001e72a290 0000000055fbd000 ffffffff80159508 0000000000000246
 ffffffff80158eb9 0000000000000000 000001001e98f578
Call Trace:<ffffffff80159508>{-2146069240} <ffffffff80158eb9>{-2146070855}
       <ffffffff801598e0>{-2146068256} <ffffffff8011f79a>{-2146306150}
       <ffffffffa0198004>{:via82cxxx_audio:via_dsp_ioctl+2340}
       <ffffffff80166dad>{-2146013779} <ffffffff80110a61>{-2146366879}


Code: ff 40 04 4d 85 f6 74 07 41 c7 06 01 00 00 00 48 8b 1c 24 48
============================================================================

Changing the order of setup to opposite fixes the problem.

Tested with 2.6.7 (compiled for K7) and 2.6.8 (compiled for AMD-64). Testing
 tool - QuakeForge.

regards,
Vladimir

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