1 files changed, 11 insertions, 2 deletions

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 282025770429..fb4bc4f5151c 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -607,6 +607,7 @@ static struct kobject *get_device_parent(struct device *dev,
         int retval;
 
         if (dev->class) {
+                static DEFINE_MUTEX(gdp_mutex);
                 struct kobject *kobj = NULL;
                 struct kobject *parent_kobj;
                 struct kobject *k;
@@ -623,6 +624,8 @@ static struct kobject *get_device_parent(struct device *dev,
                 else
                         parent_kobj = &parent->kobj;
 
+                mutex_lock(&gdp_mutex);
+
                 /* find our class-directory at the parent and reference it */
                 spin_lock(&dev->class->p->class_dirs.list_lock);
                 list_for_each_entry(k, &dev->class->p->class_dirs.list, entry)
@@ -631,20 +634,26 @@ static struct kobject *get_device_parent(struct device *dev,
                                 break;
                         }
                 spin_unlock(&dev->class->p->class_dirs.list_lock);
-                if (kobj)
+                if (kobj) {
+                        mutex_unlock(&gdp_mutex);
                         return kobj;
+                }
 
                 /* or create a new class-directory at the parent device */
                 k = kobject_create();
-                if (!k)
+                if (!k) {
+                        mutex_unlock(&gdp_mutex);
                         return NULL;
+                }
                 k->kset = &dev->class->p->class_dirs;
                 retval = kobject_add(k, parent_kobj, "%s", dev->class->name);
                 if (retval < 0) {
+                        mutex_unlock(&gdp_mutex);
                         kobject_put(k);
                         return NULL;
                 }
                 /* do not emit an uevent for this simple "glue" directory */
+                mutex_unlock(&gdp_mutex);
                 return k;
         }