unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data)
{
	if (!data->reserved)
		return __blk_mq_get_tag(data);

	return __blk_mq_get_reserved_tag(data);
}

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.