1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index 4fdea381ef21..ec117c6c996c 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -868,8 +868,10 @@ static ssize_t write_undock(struct device *dev, struct device_attribute *attr,
         if (!count)
                 return -EINVAL;
 
+        acpi_scan_lock_acquire();
         begin_undock(dock_station);
         ret = handle_eject_request(dock_station, ACPI_NOTIFY_EJECT_REQUEST);
+        acpi_scan_lock_release();
         return ret ? ret: count;
 }
 static DEVICE_ATTR(undock, S_IWUSR, NULL, write_undock);