void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file)
{
	kref_put(&file->async_file->ref, ib_uverbs_release_async_event_file);
	file->async_file = NULL;
}

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.