Merge branch 'reset' into release

2 files changed, 14 insertions, 10 deletions

diff --git a/drivers/acpi/acpica/hwxface.c b/drivers/acpi/acpica/hwxface.c
index 6f98d210e71c..f75f81ad15c9 100644
--- a/drivers/acpi/acpica/hwxface.c
+++ b/drivers/acpi/acpica/hwxface.c
@@ -80,14 +80,14 @@ acpi_status acpi_reset(void)
 
         if (reset_reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
                 /*
-                 * For I/O space, write directly to the OSL. This bypasses the port
-                 * validation mechanism, which may block a valid write to the reset
-                 * register.
+                 * For I/O space, write directly to the OSL. This
+                 * bypasses the port validation mechanism, which may
+                 * block a valid write to the reset register. Spec
+                 * section 4.7.3.6 requires register width to be 8.
                  */
                 status =
                     acpi_os_write_port((acpi_io_address) reset_reg->address,
-                                       acpi_gbl_FADT.reset_value,
-                                       reset_reg->bit_width);
+                                       acpi_gbl_FADT.reset_value, 8);
         } else {
                 /* Write the reset value to the reset register */
 
diff --git a/drivers/acpi/reboot.c b/drivers/acpi/reboot.c
index 93f91142d7ad..a6c77e8b37bd 100644
--- a/drivers/acpi/reboot.c
+++ b/drivers/acpi/reboot.c
@@ -15,9 +15,15 @@ void acpi_reboot(void)
 
         rr = &acpi_gbl_FADT.reset_register;
 
-        /* Is the reset register supported? */
-        if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) ||
-            rr->bit_width != 8 || rr->bit_offset != 0)
+        /* ACPI reset register was only introduced with v2 of the FADT */
+
+        if (acpi_gbl_FADT.header.revision < 2)
+                return;
+
+        /* Is the reset register supported? The spec says we should be
+         * checking the bit width and bit offset, but Windows ignores
+         * these fields */
+        if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER))
                 return;
 
         reset_value = acpi_gbl_FADT.reset_value;
@@ -45,6 +51,4 @@ void acpi_reboot(void)
                 acpi_reset();
                 break;
         }
-        /* Wait ten seconds */
-        acpi_os_stall(10000000);
 }