PCI/ASPM: Remove unused lists from struct pcie_link_state

ASPM does not make use of the children or link LIST_HEADs declared in
struct pcie_link_state and defined in alloc_pcie_link_state().  Therefore,
remove these lists.

No functional change intended.
Signed-off-by: Frederick Lawler <fred@fredlawl.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/pcie/aspm.c

@@ -53,8 +53,6 @@ struct pcie_link_state {
 	struct pcie_link_state *root;	/* pointer to the root port link */
 	struct pcie_link_state *parent;	/* pointer to the parent Link state */
 	struct list_head sibling;	/* node in link_list */
-	struct list_head children;	/* list of child link states */
-	struct list_head link;		/* node in parent's children list */
 
 	/* ASPM state */
 	u32 aspm_support:7;		/* Supported ASPM state */
@@ -850,8 +848,6 @@ static struct pcie_link_state *alloc_pcie_link_state(struct pci_dev *pdev)
 		return NULL;
 
 	INIT_LIST_HEAD(&link->sibling);
-	INIT_LIST_HEAD(&link->children);
-	INIT_LIST_HEAD(&link->link);
 	link->pdev = pdev;
 	link->downstream = pci_function_0(pdev->subordinate);
 
@@ -877,7 +873,6 @@ static struct pcie_link_state *alloc_pcie_link_state(struct pci_dev *pdev)
 
 		link->parent = parent;
 		link->root = link->parent->root;
-		list_add(&link->link, &parent->children);
 	}
 
 	list_add(&link->sibling, &link_list);
@@ -1001,7 +996,6 @@ void pcie_aspm_exit_link_state(struct pci_dev *pdev)
 	/* All functions are removed, so just disable ASPM for the link */
 	pcie_config_aspm_link(link, 0);
 	list_del(&link->sibling);
-	list_del(&link->link);
 	/* Clock PM is for endpoint device */
 	free_link_state(link);