3 files changed, 14 insertions, 12 deletions

diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index 215f5b30a1f..54ce12ab43d 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -48,7 +48,7 @@ struct dock_station {
         unsigned long last_dock_time;
         u32 flags;
         spinlock_t dd_lock;
-        spinlock_t hp_lock;
+        struct mutex hp_lock;
         struct list_head dependent_devices;
         struct list_head hotplug_devices;
 };
@@ -118,9 +118,9 @@ static void
 dock_add_hotplug_device(struct dock_station *ds,
                         struct dock_dependent_device *dd)
 {
-        spin_lock(&ds->hp_lock);
+        mutex_lock(&ds->hp_lock);
         list_add_tail(&dd->hotplug_list, &ds->hotplug_devices);
-        spin_unlock(&ds->hp_lock);
+        mutex_unlock(&ds->hp_lock);
 }
 
 /**
@@ -134,9 +134,9 @@ static void
 dock_del_hotplug_device(struct dock_station *ds,
                         struct dock_dependent_device *dd)
 {
-        spin_lock(&ds->hp_lock);
+        mutex_lock(&ds->hp_lock);
         list_del(&dd->hotplug_list);
-        spin_unlock(&ds->hp_lock);
+        mutex_unlock(&ds->hp_lock);
 }
 
 /**
@@ -299,7 +299,7 @@ static void hotplug_dock_devices(struct dock_station *ds, u32 event)
 {
         struct dock_dependent_device *dd;
 
-        spin_lock(&ds->hp_lock);
+        mutex_lock(&ds->hp_lock);
 
         /*
          * First call driver specific hotplug functions
@@ -321,7 +321,7 @@ static void hotplug_dock_devices(struct dock_station *ds, u32 event)
                 else
                         dock_create_acpi_device(dd->handle);
         }
-        spin_unlock(&ds->hp_lock);
+        mutex_unlock(&ds->hp_lock);
 }
 
 static void dock_event(struct dock_station *ds, u32 event, int num)
@@ -681,7 +681,7 @@ static int dock_add(acpi_handle handle)
         INIT_LIST_HEAD(&dock_station->dependent_devices);
         INIT_LIST_HEAD(&dock_station->hotplug_devices);
         spin_lock_init(&dock_station->dd_lock);
-        spin_lock_init(&dock_station->hp_lock);
+        mutex_init(&dock_station->hp_lock);
         ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list);
 
         /* initialize platform device stuff */
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index 0b00f56c2ad..88fc5d7ac73 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -60,9 +60,11 @@ static void power_down(suspend_disk_method_t mode)
 {
         switch(mode) {
         case PM_DISK_PLATFORM:
-                kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK);
-                pm_ops->enter(PM_SUSPEND_DISK);
-                break;
+                if (pm_ops && pm_ops->enter) {
+                        kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK);
+                        pm_ops->enter(PM_SUSPEND_DISK);
+                        break;
+                }
         case PM_DISK_SHUTDOWN:
                 kernel_power_off();
                 break;
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 500eb87f643..ff3a6182f5f 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -29,7 +29,7 @@
 DEFINE_MUTEX(pm_mutex);
 
 struct pm_ops *pm_ops;
-suspend_disk_method_t pm_disk_mode = PM_DISK_SHUTDOWN;
+suspend_disk_method_t pm_disk_mode = PM_DISK_PLATFORM;
 
 /**
  *      pm_set_ops - Set the global power method table.