PCI/ASPM: Don't touch ASPM if forcibly disabled

commit a26d5ecb3201c11e03663a8f4a7dedc0c5f85c07 upstream.

Don't allocate and track PCIe ASPM state when "pcie_aspm=off" is specified
on the kernel command line.

Based-on-patch-from: Matthew Garrett <mjg59@srcf.ucam.org>
Signed-off-by: Joe Lawrence <joe.lawrence@stratus.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: David Bulkow <david.bulkow@stratus.com>
Acked-by: Myron Stowe <myron.stowe@redhat.com>
[wyj: Backported to 3.4: context adjust]
Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index 474f22f..c9ce611 100644 (file)
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -583,6 +583,9 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev)
        struct pcie_link_state *link;
        int blacklist = !!pcie_aspm_sanity_check(pdev);
 
+       if (!aspm_support_enabled)
+               return;
+
        if (!pci_is_pcie(pdev) || pdev->link_state)
                return;
        if (pdev->pcie_type != PCI_EXP_TYPE_ROOT_PORT &&