This BIOS claims the VIA 8237 south bridge to be compatible with VIA 586,

which it is not.
Signed-off-by: Bertram Felgenhauer <int-e@gmx.de>

---

Without this patch, I get the following warning while booting,

among others,
| PCI: Using IRQ router VIA [1106/3227] at 0000:00:11.0

| ------------[ cut here ]------------

| WARNING: at arch/x86/pci/irq.c:265 pirq_via586_get+0x4a/0x60()

| Modules linked in:

| Pid: 1, comm: swapper Not tainted 2.6.26-rc4-00015-g1ec7d99 #1

|  [<c0119fd4>] warn_on_slowpath+0x54/0x70

|  [<c02246e0>] ? vt_console_print+0x210/0x2b0

|  [<c02244d0>] ? vt_console_print+0x0/0x2b0

|  [<c011a413>] ? __call_console_drivers+0x43/0x60

|  [<c011a482>] ? _call_console_drivers+0x52/0x80

|  [<c011aa89>] ? release_console_sem+0x1c9/0x200

|  [<c0291d21>] ? raw_pci_read+0x41/0x70

|  [<c0291e8f>] ? pci_read+0x2f/0x40

|  [<c029151a>] pirq_via586_get+0x4a/0x60

|  [<c02914d0>] ? pirq_via586_get+0x0/0x60

|  [<c029178d>] pcibios_lookup_irq+0x15d/0x430

|  [<c03b895a>] pcibios_irq_init+0x17a/0x3e0

|  [<c03a66f0>] ? kernel_init+0x0/0x250

|  [<c03a6763>] kernel_init+0x73/0x250

|  [<c03b87e0>] ? pcibios_irq_init+0x0/0x3e0

|  [<c0114d00>] ? schedule_tail+0x10/0x40

|  [<c0102dee>] ? ret_from_fork+0x6/0x1c

|  [<c03a66f0>] ? kernel_init+0x0/0x250

|  [<c03a66f0>] ? kernel_init+0x0/0x250

|  [<c010324b>] kernel_thread_helper+0x7/0x1c

|  =======================

| ---[ end trace 4eaa2a86a8e2da22 ]---
and IRQ trouble later,
| irq 10: nobody cared (try booting with the "irqpoll" option)
Now that's an VIA 8237 chip, so pirq_via586_get shouldn't be called

at all; adding this workaround to via_router_probe() fixes the

problem for me.
Amazingly I have a 2.6.23.8 kernel that somehow works fine ... I'll

never understand why.
The patch is against Linus' tree.
Please CC me in replies.
Thanks,
Bertram
 arch/x86/pci/irq.c |    7 +++++++

 1 files chang...
[ message continues ]

Cc:s added.
	Ingo

--

I didn't see the original report, pulling down the for-jesse stuff to look

through it now though.
Jesse

--

On Fri, 30 May 2008 03:20:05 +0200
Looks fine to me
Probably because it has ACPI enabled and is picking ACPI IRQ routing in

preference ?
Alan

--

applied to tip/pci-for-jesse - thanks.
	Ingo

--

No.
The "only" difference between the working 2.6.23.8 kernel and the

non-working one is a switch from gcc 3.4.6 to 4.1.2. I've collected

some information about this issue, comparing the 'working' 2.6.23.8

kernel with a newly compiled, patched one. (The unpatched one compiled

with 4.1.2 fails to boot.) So if anybody is interested, have a look at
    http://int-e.home.tlink.de/linux/irq/
But it's probably not worthwhile to spend a lot of time on this.
Bertram

--