From d1df5f3f4cfff88c989cbeec6ca0e02340494818 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1@gmail.com>
Date: Thu, 1 Apr 2021 14:03:49 +0200
Subject: [PATCH] PCI/VPD: Make missing VPD message less alarming
Realtek RTL8169/8168/8125 NIC families indicate VPD capability and an
optional VPD EEPROM can be connected via I2C/SPI. However I haven't seen
any card or system with such a VPD EEPROM yet. The missing EEPROM causes
the following warning whenever e.g. lscpi -vv is executed.
invalid short VPD tag 00 at offset 01
The warning confuses users, and I think we should handle the situation more
gently. Therefore, if first VPD byte is read as 0x00, assume a missing
optional VPD PROM and replace the warning with a more descriptive message
at info level.
[bhelgaas: fix pre-existing whitespace]
Link: https://lore.kernel.org/r/ccbc11f1-4dbb-e2c8-d0ea-559e06d4c340@gmail.com
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
drivers/pci/vpd.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/vpd.c b/drivers/pci/vpd.c
index a1d31c5d1864c..cbf784ed52163 100644
--- a/drivers/pci/vpd.c
+++ b/drivers/pci/vpd.c
@@ -71,10 +71,14 @@ static size_t pci_vpd_size(struct pci_dev *dev, size_t old_size)
size_t off = 0;
unsigned char header[1+2]; /* 1 byte tag, 2 bytes length */
- while (off < old_size &&
- pci_read_vpd(dev, off, 1, header) == 1) {
+ while (off < old_size && pci_read_vpd(dev, off, 1, header) == 1) {
unsigned char tag;
+ if (!header[0] && !off) {
+ pci_info(dev, "Invalid VPD tag 00, assume missing optional VPD EPROM\n");
+ return 0;
+ }
+
if (header[0] & PCI_VPD_LRDT) {
/* Large Resource Data Type Tag */
tag = pci_vpd_lrdt_tag(header);
--
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