1 files changed, 13 insertions, 0 deletions

diff --git a/lib/rwsem-spinlock.c b/lib/rwsem-spinlock.c
index 39a74110f55b..ccf95bff7984 100644
--- a/lib/rwsem-spinlock.c
+++ b/lib/rwsem-spinlock.c
@@ -17,6 +17,19 @@ struct rwsem_waiter {
 #define RWSEM_WAITING_FOR_WRITE 0x00000002
 };
 
+int rwsem_is_locked(struct rw_semaphore *sem)
+{
+        int ret = 1;
+        unsigned long flags;
+
+        if (spin_trylock_irqsave(&sem->wait_lock, flags)) {
+                ret = (sem->activity != 0);
+                spin_unlock_irqrestore(&sem->wait_lock, flags);
+        }
+        return ret;
+}
+EXPORT_SYMBOL(rwsem_is_locked);
+
 /*
  * initialise the semaphore
  */