linux-kernel - [PATCH 3.4 213/214] PCI/ASPM: Dont touch ASPM if forcibly disabled

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Date:	Wed,  4 Jun 2014 21:19:36 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Joe Lawrence <joe.lawrence@...atus.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	David Bulkow <david.bulkow@...atus.com>,
	Myron Stowe <myron.stowe@...hat.com>,
	Yijing Wang <wangyijing@...wei.com>
Subject: [PATCH 3.4 213/214] PCI/ASPM: Dont touch ASPM if forcibly disabled

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Joe Lawrence <joe.lawrence@...atus.com>

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@...f.ucam.org>
Signed-off-by: Joe Lawrence <joe.lawrence@...atus.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Reviewed-by: David Bulkow <david.bulkow@...atus.com>
Acked-by: Myron Stowe <myron.stowe@...hat.com>
[wyj: Backported to 3.4: context adjust]
Signed-off-by: Yijing Wang <wangyijing@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/pci/pcie/aspm.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -583,6 +583,9 @@ void pcie_aspm_init_link_state(struct pc
 	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 &&


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