diff options
| author | Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> | 2009-05-13 12:23:57 +0900 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-06-18 14:02:23 -0700 |
| commit | 5c92ffb1ecc7f13267cdef5dda8a838937912c93 (patch) | |
| tree | 50a5ffeea038549e1195d80f10b183f55c45e4ef /drivers/pci | |
| parent | 3647584d9ef35c9ec4abefdbea29959c26c54f13 (diff) | |
| download | linux-5c92ffb1ecc7f13267cdef5dda8a838937912c93.tar.bz2 | |
PCI ASPM: remove get_root_port_link
By having a pointer to the root port link, we can remove loops in
get_root_port_link() to search the root port link.
Acked-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/pcie/aspm.c | 24 |
1 files changed, 11 insertions, 13 deletions
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index 04b6a3098505..3d27c97e0486 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -33,6 +33,7 @@ struct aspm_latency { struct pcie_link_state { struct pci_dev *pdev; /* Upstream component of the Link */ + 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 */ @@ -486,26 +487,17 @@ static void __pcie_aspm_config_link(struct pcie_link_state *link, u32 state) link->aspm_enabled = state; } -static struct pcie_link_state *get_root_port_link(struct pcie_link_state *link) -{ - struct pcie_link_state *root_port_link = link; - while (root_port_link->parent) - root_port_link = root_port_link->parent; - return root_port_link; -} - /* Check the whole hierarchy, and configure each link in the hierarchy */ static void __pcie_aspm_configure_link_state(struct pcie_link_state *link, u32 state) { - struct pcie_link_state *leaf, *root = get_root_port_link(link); + struct pcie_link_state *leaf, *root = link->root; state &= (PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1); /* Check all links who have specific root port link */ list_for_each_entry(leaf, &link_list, sibling) { - if (!list_empty(&leaf->children) || - get_root_port_link(leaf) != root) + if (!list_empty(&leaf->children) || (leaf->root != root)) continue; state = pcie_aspm_check_state(leaf, state); } @@ -519,12 +511,12 @@ static void __pcie_aspm_configure_link_state(struct pcie_link_state *link, **/ if (state & PCIE_LINK_STATE_L1) { list_for_each_entry(leaf, &link_list, sibling) { - if (get_root_port_link(leaf) == root) + if (leaf->root == root) __pcie_aspm_config_link(leaf, state); } } else { list_for_each_entry_reverse(leaf, &link_list, sibling) { - if (get_root_port_link(leaf) == root) + if (leaf->root == root) __pcie_aspm_config_link(leaf, state); } } @@ -600,6 +592,12 @@ static struct pcie_link_state *pcie_aspm_setup_link_state(struct pci_dev *pdev) link->parent = parent; list_add(&link->link, &parent->children); } + /* Setup a pointer to the root port link */ + if (!link->parent) + link->root = link; + else + link->root = link->parent->root; + list_add(&link->sibling, &link_list); pdev->link_state = link; |