linux-kernel - [PATCH] PCI/ASPM: Remove unused lists from struct pcie_link

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Date:   Sun,  9 Dec 2018 16:45:50 -0600
From:   Frederick Lawler <fred@...dlawl.com>
To:     helgaas@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        ptalbert@...hat.com, Frederick Lawler <fred@...dlawl.com>
Subject: [PATCH] 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@...dlawl.com>
---
 drivers/pci/pcie/aspm.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index dcb29cb76dc6..2330ebf6df72 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/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);
 
-- 
2.17.1