1 files changed, 15 insertions, 5 deletions

diff --git a/arch/x86/mach-generic/es7000.c b/arch/x86/mach-generic/es7000.c
index 520cca0ee04e..6513d41ea21e 100644
--- a/arch/x86/mach-generic/es7000.c
+++ b/arch/x86/mach-generic/es7000.c
@@ -47,16 +47,26 @@ static __init int mps_oem_check(struct mp_config_table *mpc, char *oem,
 /* Hook from generic ACPI tables.c */
 static int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 {
-        unsigned long oem_addr;
+        unsigned long oem_addr = 0;
+        int check_dsdt;
+        int ret = 0;
+
+        /* check dsdt at first to avoid clear fix_map for oem_addr */
+        check_dsdt = es7000_check_dsdt();
+
         if (!find_unisys_acpi_oem_table(&oem_addr)) {
-                if (es7000_check_dsdt())
-                        return parse_unisys_oem((char *)oem_addr);
+                if (check_dsdt)
+                        ret = parse_unisys_oem((char *)oem_addr);
                 else {
                         setup_unisys();
-                        return 1;
+                        ret = 1;
                 }
+                /*
+                 * we need to unmap it
+                 */
+                unmap_unisys_acpi_oem_table(oem_addr);
         }
-        return 0;
+        return ret;
 }
 #else
 static int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)