Early ACPI lockup (was Re: 2.6.20-rc4-mm1)

[Frederik Deweerdt <deweerdt@free.fr>]

On Thu, Jan 11, 2007 at 10:26:27PM -0800, Andrew Morton wrote:
> 
>   ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.20-rc3/2.6.20-rc4-mm1/
> 
Hi,

The git-acpi.patch replaces earlier "if(!handler) return -EINVAL" by
"BUG_ON(!handler)". This locks my machine early at boot with a message
along the lines of (It's hand copied):
Int 6: cr2: 00000000 eip: c0570e05 flags: 00010046 cs: 60
stack: c054ffac c011db2b c04936d0 c054ff68 c054ffc0 c054fff4 c057da2c

Reverting the change as follows, allows booting:
Any ideas to debug this further?

Regards,
Frederik

diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index db0c5f6..fba018c 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -414,7 +414,9 @@ int __init acpi_table_parse(enum acpi_ta
 	unsigned int index;
 	unsigned int count = 0;
 
-	BUG_ON(!handler);
+	if (!handler)
+		return -EINVAL;
+	/*BUG_ON(!handler);*/
 
 	for (i = 0; i < sdt_count; i++) {
 		if (sdt_entry[i].id != id)