ACPI / dock: Drop the hp_lock mutex from struct dock_station

The only existing user of the hp_lock mutex in struct dock_station,
hotplug_dock_devices(), is always called under acpi_scan_lock and
cannot race with another instance of itself, so drop the mutex
which is not necessary.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 0 insertions, 5 deletions

diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index 810d1d720b1f..c10761533d6f 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -63,7 +63,6 @@ struct dock_station {
         acpi_handle handle;
         unsigned long last_dock_time;
         u32 flags;
-        struct mutex hp_lock;
         struct list_head dependent_devices;
 
         struct list_head sibling;
@@ -351,8 +350,6 @@ static void hotplug_dock_devices(struct dock_station *ds, u32 event)
 {
         struct dock_dependent_device *dd;
 
-        mutex_lock(&ds->hp_lock);
-
         /*
          * First call driver specific hotplug functions
          */
@@ -371,7 +368,6 @@ static void hotplug_dock_devices(struct dock_station *ds, u32 event)
                 else
                         dock_create_acpi_device(dd->handle);
         }
-        mutex_unlock(&ds->hp_lock);
 }
 
 static void dock_event(struct dock_station *ds, u32 event, int num)
@@ -893,7 +889,6 @@ static int __init dock_add(acpi_handle handle)
         dock_station->dock_device = dd;
         dock_station->last_dock_time = jiffies - HZ;
 
-        mutex_init(&dock_station->hp_lock);
         INIT_LIST_HEAD(&dock_station->sibling);
         INIT_LIST_HEAD(&dock_station->dependent_devices);