1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 59eba29a6066..d64a5826ef35 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -41,6 +41,7 @@ static DEFINE_MUTEX(acpi_scan_lock);
 static LIST_HEAD(acpi_scan_handlers_list);
 DEFINE_MUTEX(acpi_device_lock);
 LIST_HEAD(acpi_wakeup_device_list);
+static DEFINE_MUTEX(acpi_hp_context_lock);
 
 struct acpi_device_bus_id{
         char bus_id[15];
@@ -60,6 +61,16 @@ void acpi_scan_lock_release(void)
 }
 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
 
+void acpi_lock_hp_context(void)
+{
+        mutex_lock(&acpi_hp_context_lock);
+}
+
+void acpi_unlock_hp_context(void)
+{
+        mutex_unlock(&acpi_hp_context_lock);
+}
+
 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
 {
         if (!handler || !handler->attach)