Linux 2.6.34-rc5

[safe/jmp/linux-2.6] / lib / kref.c

diff --git a/lib/kref.c b/lib/kref.c
index 0d07cc3..6d19f69 100644 (file)
--- a/lib/kref.c
+++ b/lib/kref.c
@@ -13,6 +13,18 @@
 
 #include <linux/kref.h>
 #include <linux/module.h>
+#include <linux/slab.h>
+
+/**
+ * kref_set - initialize object and set refcount to requested number.
+ * @kref: object in question.
+ * @num: initial reference counter
+ */
+void kref_set(struct kref *kref, int num)
+{
+       atomic_set(&kref->refcount, num);
+       smp_mb();
+}
 
 /**
  * kref_init - initialize object.
@@ -20,7 +32,7 @@
  */
 void kref_init(struct kref *kref)
 {
-       atomic_set(&kref->refcount,1);
+       kref_set(kref, 1);
 }
 
 /**
@@ -31,6 +43,7 @@ void kref_get(struct kref *kref)
 {
        WARN_ON(!atomic_read(&kref->refcount));
        atomic_inc(&kref->refcount);
+       smp_mb__after_atomic_inc();
 }
 
 /**
@@ -59,6 +72,7 @@ int kref_put(struct kref *kref, void (*release)(struct kref *kref))
        return 0;
 }
 
+EXPORT_SYMBOL(kref_set);
 EXPORT_SYMBOL(kref_init);
 EXPORT_SYMBOL(kref_get);
 EXPORT_SYMBOL(kref_put);