ACPI: Remove a redundant call to acpi_hw_register_read().

Signed-off-by: Wei Gang <gang.wei@intel.com>

diff --git a/xen/drivers/acpi/hwregs.c b/xen/drivers/acpi/hwregs.c
index 2fff2d5cf0c7547501d52747e13ccde6593dd0cf..38423bc394fbf005e46e5a956838a438373d667d 100644 (file)
--- a/xen/drivers/acpi/hwregs.c
+++ b/xen/drivers/acpi/hwregs.c
@@ -239,11 +239,13 @@ acpi_status acpi_set_register(u32 register_id, u32 value)
 
        case ACPI_REGISTER_PM2_CONTROL:
 
+#if 0 /* Redundant read in original Linux code. */
                status = acpi_hw_register_read(ACPI_REGISTER_PM2_CONTROL,
                                               &register_value);
                if (ACPI_FAILURE(status)) {
                        goto unlock_and_exit;
                }
+#endif
 
                ACPI_DEBUG_PRINT((ACPI_DB_IO,
                                  "PM2 control: Read %X from %8.8X%8.8X\n",