[PATCH] i386: srat on non-acpi hw fix

This patch adds a check for the return value of acpi_find_root_pointer().
Without this patch systems without ACPI support such as QEMU crashes when
booting a NUMA kernel with CONFIG_ACPI_SRAT=y.

Signed-off-by: Magnus Damm <magnus@valinux.co.jp>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/arch/i386/kernel/srat.c b/arch/i386/kernel/srat.c
index 516bf5653b02..8de658db8146 100644
--- a/arch/i386/kernel/srat.c
+++ b/arch/i386/kernel/srat.c
@@ -327,7 +327,12 @@ int __init get_memcfg_from_srat(void)
         int tables = 0;
         int i = 0;
 
-        acpi_find_root_pointer(ACPI_PHYSICAL_ADDRESSING, rsdp_address);
+        if (ACPI_FAILURE(acpi_find_root_pointer(ACPI_PHYSICAL_ADDRESSING,
+                                                rsdp_address))) {
+                printk("%s: System description tables not found\n",
+                       __FUNCTION__);
+                goto out_err;
+        }
 
         if (rsdp_address->pointer_type == ACPI_PHYSICAL_POINTER) {
                 printk("%s: assigning address to rsdp\n", __FUNCTION__);