[Qemu-stable] [PATCH applied] acpi: fix tables for no-hpet configuration

[Michael S. Tsirkin]

acpi build tried to add offset of hpet table to rsdt even when hpet was
disabled.  If no tables follow hpet, this could lead to a malformed
rsdt.

Fix it up.

To avoid such errors in the future, rearrange code slightly to make it
clear that acpi_add_table stores the offset of the following table - not
of the previous one.

Reported-by: TeLeMan <address@hidden>
Signed-off-by: Michael S. Tsirkin <address@hidden>
Cc: address@hidden
---
 hw/i386/acpi-build.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 1ef8ca9..9fac589 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -1416,15 +1416,16 @@ void acpi_build(PcGuestInfo *guest_info, 
AcpiBuildTables *tables)
     /* ACPI tables pointed to by RSDT */
     acpi_add_table(table_offsets, tables->table_data);
     build_fadt(tables->table_data, tables->linker, &pm, facs, dsdt);
-    acpi_add_table(table_offsets, tables->table_data);
 
+    acpi_add_table(table_offsets, tables->table_data);
     build_ssdt(tables->table_data, tables->linker, &cpu, &pm, &misc, &pci,
                guest_info);
-    acpi_add_table(table_offsets, tables->table_data);
 
-    build_madt(tables->table_data, tables->linker, &cpu, guest_info);
     acpi_add_table(table_offsets, tables->table_data);
+    build_madt(tables->table_data, tables->linker, &cpu, guest_info);
+
     if (misc.has_hpet) {
+        acpi_add_table(table_offsets, tables->table_data);
         build_hpet(tables->table_data, tables->linker);
     }
     if (guest_info->numa_nodes) {
-- 
MST