---

yaml --- r: 322091 b: refs/heads/master c: 8ad5db8 h: refs/heads/master i: 322089: 498043f 322087: 9bda5f5 v: v3
git-mirror · Aug 22, 2012 · 1710876 · 1710876
1 parent e836d35
commit 1710876
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Showing 2 changed files with 19 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 934ad4c235f87dcb9206abdfa22922358999afab
+refs/heads/master: 8ad5db8a8ddbe3bd33078863a027011e28f1f4ee
diff --git a/trunk/include/linux/kref.h b/trunk/include/linux/kref.h
@@ -18,6 +18,7 @@
 #include <linux/bug.h>
 #include <linux/atomic.h>
 #include <linux/kernel.h>
+#include <linux/mutex.h>
 
 struct kref {
 	atomic_t refcount;
@@ -93,4 +94,21 @@ static inline int kref_put(struct kref *kref, void (*release)(struct kref *kref)
 {
 	return kref_sub(kref, 1, release);
 }
+
+static inline int kref_put_mutex(struct kref *kref,
+				 void (*release)(struct kref *kref),
+				 struct mutex *lock)
+{
+	WARN_ON(release == NULL);
+        if (unlikely(!atomic_add_unless(&kref->refcount, -1, 1))) {
+		mutex_lock(lock);
+		if (unlikely(!atomic_dec_and_test(&kref->refcount))) {
+			mutex_unlock(lock);
+			return 0;
+		}
+		release(kref);
+		return 1;
+	}
+	return 0;
+}
 #endif /* _KREF_H_ */