Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

This merges (3f509c6 netfilter: nf_nat_sip: fix incorrect handling
of EBUSY for RTCP expectation) to Patrick McHardy's IPv6 NAT changes.

1 files changed, 18 insertions, 0 deletions

diff --git a/include/linux/kref.h b/include/linux/kref.h
index 9c07dcebded..65af6887872 100644
--- a/include/linux/kref.h
+++ b/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_ */