[PATCH] PCI/VPD: Disable VPD for Lenovo Realtek RTL8111xP devices

[Qiang Ma <maqianga@uniontech.com>]

The Lenovo 17aa:507e RTL8111xP multi-function device exposes a VPD
capability on all functions, but the VPD storage is not usable.
Function 0 returns an invalid first tag and functions 1-4 never complete
VPD transactions.

This produces noisy dmesg output when userspace reads the VPD sysfs
attribute, including:

[   16.654155] r8169 0000:02:00.0: invalid VPD tag 0x00 (size 0) at offset 0; assume missing optional EEPROM
[   16.790913] serial 0000:02:00.1: VPD access failed.  This is likely a firmware bug on this device.  Contact the card vendor for a firmware update
[   16.931963] serial 0000:02:00.2: VPD access failed.  This is likely a firmware bug on this device.  Contact the card vendor for a firmware update
[   17.071445] pci 0000:02:00.3: VPD access failed.  This is likely a firmware bug on this device.  Contact the card vendor for a firmware update
[   17.210910] ehci-pci 0000:02:00.4: VPD access failed.  This is likely a firmware bug on this device.  Contact the card vendor for a firmware update

VPD is optional. Disable VPD for this exact subsystem and revision so the
PCI core does not expose a broken VPD sysfs file that cannot be read.

Signed-off-by: Qiang Ma <maqianga@uniontech.com>
---
 drivers/pci/vpd.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/pci/vpd.c b/drivers/pci/vpd.c
index 153394a652d3..492e0d669ea8 100644
--- a/drivers/pci/vpd.c
+++ b/drivers/pci/vpd.c
@@ -597,6 +597,32 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATTANSIC, PCI_ANY_ID, quirk_blacklist_vpd
 DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_VENDOR_ID_AMAZON_ANNAPURNA_LABS, 0x0031,
 			       PCI_CLASS_BRIDGE_PCI, 8, quirk_blacklist_vpd);
 
+/*
+ * The Lenovo 17aa:507e RTL8111xP multi-function device advertises VPD
+ * on all functions, but the VPD data is not usable.  Function 0 returns
+ * an invalid first tag and functions 1-4 never complete VPD accesses.
+ */
+static void quirk_lenovo_realtek_rtl8111xp_no_vpd(struct pci_dev *dev)
+{
+	if (dev->revision != 0x0e ||
+	    dev->subsystem_vendor != PCI_VENDOR_ID_LENOVO ||
+	    dev->subsystem_device != 0x507e)
+		return;
+
+	dev->vpd.len = PCI_VPD_SZ_INVALID;
+	pci_warn(dev, FW_BUG "disabling VPD access (can't determine size of non-standard VPD format)\n");
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_REALTEK, 0x8168,
+			 quirk_lenovo_realtek_rtl8111xp_no_vpd);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_REALTEK, 0x816a,
+			 quirk_lenovo_realtek_rtl8111xp_no_vpd);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_REALTEK, 0x816b,
+			 quirk_lenovo_realtek_rtl8111xp_no_vpd);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_REALTEK, 0x816c,
+			 quirk_lenovo_realtek_rtl8111xp_no_vpd);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_REALTEK, 0x816d,
+			 quirk_lenovo_realtek_rtl8111xp_no_vpd);
+
 static void quirk_chelsio_extend_vpd(struct pci_dev *dev)
 {
 	int chip = (dev->device & 0xf000) >> 12;
-- 
2.20.1