[BUG] buggy ali5451 driver

[Thierry Vignaud <tvignaud@mandrakesoft.com>]

regarding ali5451 problems that show up on kml, i just had access to
oliver's laptop which has the infamous ali5451.

both oss' trident and alsa's snd-ali5451 cannot 

# modprobe snd-ali5451
PCI: Found IRQ 4 for device 00:08:0
URQ routing conflict for 00:08:0, have irq 5, want irq 4

then kernel cries:
hda: status timeout: status=0x80 { Busy }
hda: DMA disabled
hda: drive not ready for command.

disks cannot anymore be accessed. the system is still fine (no oops,
no freeze).
the vfs & ext3 then ended in I/O error since the disks answered
themselves busy to the eide controller.


the bugs ali5451 chips suffer may be related to :

- either the poor ressources allocation on laptios, which is poorer &
  poorer since acpi "invade" laptops

- or driver misconception regarding irq sharing


the cars is "M5451 PCI South Bridge Audio" manufactured by Acer
Laboratories Inc. [ALi] (with pci ids : 0x10b9 0x5451)


irq 5 has been allocated to ali snd card, pcmcia cardbus controller
(managed by yenta_socket).


olivier <olivier.ricordeau@wanadoo.fr> is the owner of that fscking
chip.

this is a compaq laptop.

i have access to another compaq laptop that works well with oss
trident.  this is a compaq laptop too.



kernel is 2.4.18 based and alsa was tested with 0.9.0rc3 & rc5



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