fix idr_find() locking
[linux-2.6.git] / kernel / rwsem.c
index 790a99b..1ec620c 100644 (file)
@@ -20,7 +20,7 @@ void down_read(struct rw_semaphore *sem)
        might_sleep();
        rwsem_acquire_read(&sem->dep_map, 0, 0, _RET_IP_);
 
-       __down_read(sem);
+       LOCK_CONTENDED(sem, __down_read_trylock, __down_read);
 }
 
 EXPORT_SYMBOL(down_read);
@@ -47,7 +47,7 @@ void down_write(struct rw_semaphore *sem)
        might_sleep();
        rwsem_acquire(&sem->dep_map, 0, 0, _RET_IP_);
 
-       __down_write(sem);
+       LOCK_CONTENDED(sem, __down_write_trylock, __down_write);
 }
 
 EXPORT_SYMBOL(down_write);
@@ -60,7 +60,7 @@ int down_write_trylock(struct rw_semaphore *sem)
        int ret = __down_write_trylock(sem);
 
        if (ret == 1)
-               rwsem_acquire(&sem->dep_map, 0, 0, _RET_IP_);
+               rwsem_acquire(&sem->dep_map, 0, 1, _RET_IP_);
        return ret;
 }
 
@@ -103,3 +103,45 @@ void downgrade_write(struct rw_semaphore *sem)
 }
 
 EXPORT_SYMBOL(downgrade_write);
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+
+void down_read_nested(struct rw_semaphore *sem, int subclass)
+{
+       might_sleep();
+       rwsem_acquire_read(&sem->dep_map, subclass, 0, _RET_IP_);
+
+       LOCK_CONTENDED(sem, __down_read_trylock, __down_read);
+}
+
+EXPORT_SYMBOL(down_read_nested);
+
+void down_read_non_owner(struct rw_semaphore *sem)
+{
+       might_sleep();
+
+       __down_read(sem);
+}
+
+EXPORT_SYMBOL(down_read_non_owner);
+
+void down_write_nested(struct rw_semaphore *sem, int subclass)
+{
+       might_sleep();
+       rwsem_acquire(&sem->dep_map, subclass, 0, _RET_IP_);
+
+       LOCK_CONTENDED(sem, __down_write_trylock, __down_write);
+}
+
+EXPORT_SYMBOL(down_write_nested);
+
+void up_read_non_owner(struct rw_semaphore *sem)
+{
+       __up_read(sem);
+}
+
+EXPORT_SYMBOL(up_read_non_owner);
+
+#endif
+
+