ACPICA: Fix access width for reset vector

Section 4.7.3.6 of the ACPI specification requires that the register width
of the reset vector be 8 bits. Windows simply hardcodes the access to be
a byte and ignores the width provided in the FADT, so make sure that we
do the same.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 5 insertions, 5 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 */