linux-kernel - [PATCH 4.14 031/193] PCI/ASPM: Use correct capability pointer to program LTR_L1.2

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Date:   Tue, 28 Nov 2017 11:24:38 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
        Vidya Sagar <vidyas@...dia.com>,
        Rajat Jain <rajatja@...gle.com>
Subject: [PATCH 4.14 031/193] PCI/ASPM: Use correct capability pointer to program LTR_L1.2_THRESHOLD

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

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

From: Bjorn Helgaas <bhelgaas@...gle.com>

commit c00054f540bf81e592e1fee709b0bdbf20f478b5 upstream.

Previously we programmed the LTR_L1.2_THRESHOLD in the parent (upstream)
device using the capability pointer of the *child* (downstream) device,
which corrupted some random word of the parent's config space.

Use the parent's L1 SS capability pointer to program its
LTR_L1.2_THRESHOLD.

Fixes: aeda9adebab8 ("PCI/ASPM: Configure L1 substate settings")
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Reviewed-by: Vidya Sagar <vidyas@...dia.com>
CC: Rajat Jain <rajatja@...gle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/pci/pcie/aspm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -658,7 +658,7 @@ static void pcie_config_aspm_l1ss(struct
 					0xFF00, link->l1ss.ctl1);
 
 		/* Program LTR L1.2 threshold in both ports */
-		pci_clear_and_set_dword(parent,	dw_cap_ptr + PCI_L1SS_CTL1,
+		pci_clear_and_set_dword(parent,	up_cap_ptr + PCI_L1SS_CTL1,
 					0xE3FF0000, link->l1ss.ctl1);
 		pci_clear_and_set_dword(child, dw_cap_ptr + PCI_L1SS_CTL1,
 					0xE3FF0000, link->l1ss.ctl1);