1 files changed, 33 insertions, 0 deletions

diff --git a/include/linux/kref.h b/include/linux/kref.h
index e15828fd71f1..484604d184be 100644
--- a/include/linux/kref.h
+++ b/include/linux/kref.h
@@ -19,6 +19,7 @@
 #include <linux/atomic.h>
 #include <linux/kernel.h>
 #include <linux/mutex.h>
+#include <linux/spinlock.h>
 
 struct kref {
         atomic_t refcount;
@@ -98,6 +99,38 @@ static inline int kref_put(struct kref *kref, void (*release)(struct kref *kref)
         return kref_sub(kref, 1, release);
 }
 
+/**
+ * kref_put_spinlock_irqsave - decrement refcount for object.
+ * @kref: object.
+ * @release: pointer to the function that will clean up the object when the
+ *           last reference to the object is released.
+ *           This pointer is required, and it is not acceptable to pass kfree
+ *           in as this function.
+ * @lock: lock to take in release case
+ *
+ * Behaves identical to kref_put with one exception.  If the reference count
+ * drops to zero, the lock will be taken atomically wrt dropping the reference
+ * count.  The release function has to call spin_unlock() without _irqrestore.
+ */
+static inline int kref_put_spinlock_irqsave(struct kref *kref,
+                void (*release)(struct kref *kref),
+                spinlock_t *lock)
+{
+        unsigned long flags;
+
+        WARN_ON(release == NULL);
+        if (atomic_add_unless(&kref->refcount, -1, 1))
+                return 0;
+        spin_lock_irqsave(lock, flags);
+        if (atomic_dec_and_test(&kref->refcount)) {
+                release(kref);
+                local_irq_restore(flags);
+                return 1;
+        }
+        spin_unlock_irqrestore(lock, flags);
+        return 0;
+}
+
 static inline int kref_put_mutex(struct kref *kref,
                                  void (*release)(struct kref *kref),
                                  struct mutex *lock)