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Subject[PATCH] Check for X__DSDT in acpi_get_table_header_early()

I finally got tired of my rx2600 printing garbage at the end of
the list of ACPI tables so I decided to fix it. Turns out the HP
rx2600 does not provide a DSDT in the FADT, so we were trying to
print a table at 0x0. It does provide a X_DSDT. This patch will
make acpi_get_table_header_early() prefer the X_DSDT over the DSDT
and adds more checking for null. Looks like the same code is in
2.6 and 2.4, please apply for both. Thanks,

Alex

--
Alex Williamson HP Linux & Open Source Lab--- linux/drivers/acpi/tables.c 2003-07-27 11:00:40.000000000 -0600
+++ linux/drivers/acpi/tables.c 2003-08-07 14:15:11.000000000 -0600
@@ -256,10 +256,17 @@

/* Map the DSDT header via the pointer in the FADT */
if (id == ACPI_DSDT) {
- struct acpi_table_fadt *fadt = (struct acpi_table_fadt *) *header;
+ struct fadt_descriptor_rev2 *fadt = (struct fadt_descriptor_rev2 *) *header;
+
+ if (fadt->header.revision == 3 && fadt->Xdsdt) {
+ *header = (void *) __acpi_map_table(fadt->Xdsdt,
+ sizeof(struct acpi_table_header));
+ } else if (fadt->V1_dsdt) {
+ *header = (void *) __acpi_map_table(fadt->V1_dsdt,
+ sizeof(struct acpi_table_header));
+ } else
+ *header = 0;

- *header = (void *) __acpi_map_table(fadt->dsdt_addr,
- sizeof(struct acpi_table_header));
if (!*header) {
printk(KERN_WARNING PREFIX "Unable to map DSDT\n");
return -ENODEV;
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