x86: acpi: Fix madt lapic generation

An accumulated length was incorrectly added to current each pass
through the loop. On system with more than 2 cores this caused a
corrupt MADT to be generated.

Signed-off-by: George McCollister <george.mccollister@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

diff --git a/arch/x86/lib/acpi_table.c b/arch/x86/lib/acpi_table.c
index ffb4678..bb71286 100644 (file)
--- a/arch/x86/lib/acpi_table.c
+++ b/arch/x86/lib/acpi_table.c
@@ -183,20 +183,20 @@ static int acpi_create_madt_lapic(struct acpi_madt_lapic *lapic,
 int acpi_create_madt_lapics(u32 current)
 {
        struct udevice *dev;
-       int length = 0;
+       int total_length = 0;
 
        for (uclass_find_first_device(UCLASS_CPU, &dev);
             dev;
             uclass_find_next_device(&dev)) {
                struct cpu_platdata *plat = dev_get_parent_platdata(dev);
-
-               length += acpi_create_madt_lapic(
-                       (struct acpi_madt_lapic *)current,
-                       plat->cpu_id, plat->cpu_id);
+               int length = acpi_create_madt_lapic(
+                               (struct acpi_madt_lapic *)current,
+                               plat->cpu_id, plat->cpu_id);
                current += length;
+               total_length += length;
        }
 
-       return length;
+       return total_length;
 }
 
 int acpi_create_madt_ioapic(struct acpi_madt_ioapic *ioapic, u8 id,