linux-kernel - [PATCH AUTOSEL 4.9 09/98] PCI: Disable MSI for HiSilicon Hip06/Hip07 only in Root Port mode

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Message-Id: <20181025141423.213774-9-sashal@kernel.org>
Date:   Thu, 25 Oct 2018 10:12:54 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Dongdong Liu <liudongdong3@...wei.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.9 09/98] PCI: Disable MSI for HiSilicon Hip06/Hip07 only in Root Port mode

From: Dongdong Liu <liudongdong3@...wei.com>

[ Upstream commit deb86999323661c019ef2740eb9d479d1e526b5c ]

HiSilicon Hip06/Hip07 can operate as either a Root Port or an Endpoint.  It
always advertises an MSI capability, but it can only generate MSIs when in
Endpoint mode.

The device has the same Vendor and Device IDs in both modes, so check the
Class Code and disable MSI only when operating as a Root Port.

[bhelgaas: changelog]
Fixes: 72f2ff0deb87 ("PCI: Disable MSI for HiSilicon Hip06/Hip07 Root Ports")
Signed-off-by: Dongdong Liu <liudongdong3@...wei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Reviewed-by: Zhou Wang <wangzhou1@...ilicon.com>
Cc: stable@...r.kernel.org	# v4.11+
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/pci/quirks.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index c7a695c2303a..2250f0d33481 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -1634,8 +1634,8 @@ static void quirk_pcie_mch(struct pci_dev *pdev)
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_E7520_MCH,	quirk_pcie_mch);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_E7320_MCH,	quirk_pcie_mch);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_E7525_MCH,	quirk_pcie_mch);
-DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_HUAWEI,	0x1610,	quirk_pcie_mch);
 
+DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_HUAWEI, 0x1610, PCI_CLASS_BRIDGE_PCI, 8, quirk_pcie_mch);
 
 /*
  * It's possible for the MSI to get corrupted if shpc and acpi
-- 
2.17.1