1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index f7ca8c55956b..c1d59cfdb5fb 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -202,15 +202,38 @@ static void acpi_state_timer_broadcast(struct acpi_processor *pr,
  * Suspend / resume control
  */
 static int acpi_idle_suspend;
+static u32 saved_bm_rld;
+
+static void acpi_idle_bm_rld_save(void)
+{
+        acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
+}
+static void acpi_idle_bm_rld_restore(void)
+{
+        u32 resumed_bm_rld;
+
+        acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
+
+        if (resumed_bm_rld != saved_bm_rld)
+                acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
+}
 
 int acpi_processor_suspend(struct acpi_device * device, pm_message_t state)
 {
+        if (acpi_idle_suspend == 1)
+                return 0;
+
+        acpi_idle_bm_rld_save();
         acpi_idle_suspend = 1;
         return 0;
 }
 
 int acpi_processor_resume(struct acpi_device * device)
 {
+        if (acpi_idle_suspend == 0)
+                return 0;
+
+        acpi_idle_bm_rld_restore();
         acpi_idle_suspend = 0;
         return 0;
 }