1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 147bc1b91b42..3f2bdc812d23 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -1810,6 +1810,16 @@ acpi_status __init acpi_os_initialize(void)
         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
         acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
+        if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
+                /*
+                 * Use acpi_os_map_generic_address to pre-map the reset
+                 * register if it's in system memory.
+                 */
+                int rv;
+
+                rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
+                pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
+        }
 
         return AE_OK;
 }
@@ -1838,6 +1848,8 @@ acpi_status acpi_os_terminate(void)
         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
         acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
+        if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
+                acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
 
         destroy_workqueue(kacpid_wq);
         destroy_workqueue(kacpi_notify_wq);