ACPI: tables: complete searching upon RSDP w/ bad checksum.

ACPI tables follow a tree structure in memory.
The root of the tree is the RSDP (Root System Description Pointer).

To find the RSDP, the OS searches for the signature "RSD PTR "
in well known physical memory locations.  Then the OS computes
a table checksum to verify that the signature is really part
of a valid table header.

Some systems have a proper signature but an invalid checksum;
followed elsewhere by a proper signature with valid checksum.

http://bugzilla.kernel.org/show_bug.cgi?id=9444

The Linux RSDP scanning code bailed out on those systems
and as a result they booted with ACPI disabled.

Fix this by deleting the Linux RSDP scanning code and
plugging in the ACPICA RSDP scanning code.

Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 14 insertions, 12 deletions

diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c
index 897e2083a3b1..63d6dcdc2e2a 100644
--- a/arch/ia64/kernel/acpi.c
+++ b/arch/ia64/kernel/acpi.c
@@ -69,6 +69,20 @@ unsigned int acpi_cpei_phys_cpuid;
 
 unsigned long acpi_wakeup_address = 0;
 
+#ifdef CONFIG_IA64_GENERIC
+static unsigned long __init acpi_find_rsdp(void)
+{
+        unsigned long rsdp_phys = 0;
+
+        if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
+                rsdp_phys = efi.acpi20;
+        else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
+                printk(KERN_WARNING PREFIX
+                       "v1.0/r0.71 tables no longer supported\n");
+        return rsdp_phys;
+}
+#endif
+
 const char __init *
 acpi_get_sysname(void)
 {
@@ -631,18 +645,6 @@ static int __init acpi_parse_fadt(struct acpi_table_header *table)
         return 0;
 }
 
-unsigned long __init acpi_find_rsdp(void)
-{
-        unsigned long rsdp_phys = 0;
-
-        if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
-                rsdp_phys = efi.acpi20;
-        else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
-                printk(KERN_WARNING PREFIX
-                       "v1.0/r0.71 tables no longer supported\n");
-        return rsdp_phys;
-}
-
 int __init acpi_boot_init(void)
 {