linux-kernel - [PATCH 4.4 133/135] PCI: Disable MSI for HiSilicon Hip06/Hip07 only in Root Port mode

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Message-Id: <20200629155309.2495516-134-sashal@kernel.org>
Date:   Mon, 29 Jun 2020 11:53:07 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Dongdong Liu <liudongdong3@...wei.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Zhou Wang <wangzhou1@...ilicon.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 4.4 133/135] PCI: Disable MSI for HiSilicon Hip06/Hip07 only in Root Port mode

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

commit deb86999323661c019ef2740eb9d479d1e526b5c upstream.

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: Greg Kroah-Hartman <gregkh@...uxfoundation.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 eeb771ecda15b..ab161bbeb4d41 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -1623,8 +1623,8 @@ 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
-- 
2.25.1