sysfs: driver core: Fix glue dir race condition by gdp_mutex

[firefly-linux-kernel-4.4.55.git] / drivers / base / core.c

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 14d162952c3bc21bdadf3966ccef0c7b2c43df91..842d04707de6b04dc6eec9f5aab9acb8885d235a 100644 (file)
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -724,12 +724,12 @@ class_dir_create_and_add(struct class *class, struct kobject *parent_kobj)
        return &dir->kobj;
 }
 
+static DEFINE_MUTEX(gdp_mutex);
 
 static struct kobject *get_device_parent(struct device *dev,
                                         struct device *parent)
 {
        if (dev->class) {
-               static DEFINE_MUTEX(gdp_mutex);
                struct kobject *kobj = NULL;
                struct kobject *parent_kobj;
                struct kobject *k;
@@ -793,7 +793,9 @@ static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir)
            glue_dir->kset != &dev->class->p->glue_dirs)
                return;
 
+       mutex_lock(&gdp_mutex);
        kobject_put(glue_dir);
+       mutex_unlock(&gdp_mutex);
 }
 
 static void cleanup_device_parent(struct device *dev)