From: Babu Moger <babu.moger@xxxxxxxxxx>
Reading or Writing of PCI VPD data causes system panic.
We saw this problem by running "lspci -vvv" in the beginning.
However this can be easily reproduced by running
cat /sys/bus/devices/XX../vpd
As even a simple read on any VPD data triggers a system
lockup on certain cards this patch implements a PCI quirk
to disabling VPD acces altogether by setting the vpd length
to '0'.
Signed-off-by: Babu Moger <babu.moger@xxxxxxxxxx>
Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
---
drivers/pci/access.c | 5 ++++-
drivers/pci/quirks.c | 41 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 45 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/access.c b/drivers/pci/access.c
index 914e023..82f41a8 100644
--- a/drivers/pci/access.c
+++ b/drivers/pci/access.c
@@ -396,7 +396,7 @@ static ssize_t pci_vpd_pci22_read(struct pci_dev *dev, loff_t pos, size_t count,
if (pos < 0)
return -EINVAL;
- if (!vpd->valid) {
+ if (!vpd->valid && vpd->base.len > 0) {
vpd->valid = true;
vpd->base.len = pci_vpd_pci22_size(dev);
}
@@ -459,6 +459,9 @@ static ssize_t pci_vpd_pci22_write(struct pci_dev *dev, loff_t pos, size_t count
loff_t end = pos + count;
int ret = 0;
+ if (vpd->base.len == 0)
+ return -EIO;
+
if (!vpd->valid)
return -EAGAIN;
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 7e32730..af0f8a1 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -2123,6 +2123,47 @@ static void quirk_via_cx700_pci_parking_caching(struct pci_dev *dev)
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, 0x324e, quirk_via_cx700_pci_parking_caching);
/*
+ * A read/write to sysfs entry ('/sys/bus/pci/devices/<id>/vpd')
+ * will dump 32k of data. The default length is set as 32768.
+ * Reading a full 32k will cause an access beyond the VPD end tag.
+ * The system behaviour at that point is mostly unpredictable.
+ * Apparently, some vendors have not implemented this VPD headers properly.
+ * Adding a generic function disable vpd data for these buggy adapters
+ * Add the DECLARE_PCI_FIXUP_FINAL line below with the specific with
+ * vendor and device of interest to use this quirk.
+ */
+static void quirk_blacklist_vpd(struct pci_dev *dev)
+{
+ if (dev->vpd) {
+ dev->vpd->len = 0;
+ dev_warn(&dev->dev, "PCI vpd access has been disabled due to firmware bug\n");
+ }
+}
+
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x0060,
+ quirk_blacklist_vpd);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x007c,
+ quirk_blacklist_vpd);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x0413,
+ quirk_blacklist_vpd);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x0078,
+ quirk_blacklist_vpd);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x0079,
+ quirk_blacklist_vpd);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x0073,
+ quirk_blacklist_vpd);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x0071,
+ quirk_blacklist_vpd);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x005b,
+ quirk_blacklist_vpd);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x002f,
+ quirk_blacklist_vpd);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x005d,
+ quirk_blacklist_vpd);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x005f,
+ quirk_blacklist_vpd);
+
+/*
* For Broadcom 5706, 5708, 5709 rev. A nics, any read beyond the
* VPD end tag will hang the device. This problem was initially
* observed when a vpd entry was created in sysfs
--
1.8.5.6
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