diff --git a/drivers/pci/access.c b/drivers/pci/access.c
index 01b9d0a..d11cdbb 100644
--- a/drivers/pci/access.c
+++ b/drivers/pci/access.c
@@ -275,6 +275,19 @@ ssize_t pci_write_vpd(struct pci_dev *dev, loff_t pos, size_t count, const void
 }
 EXPORT_SYMBOL(pci_write_vpd);
 
+/**
+ * pci_set_vpd_size - Set size of Vital Product Data space
+ * @dev:	pci device struct
+ * @len:	size of vpd space
+ */
+int pci_set_vpd_size(struct pci_dev *dev, size_t len)
+{
+	if (!dev->vpd || !dev->vpd->ops)
+		return -ENODEV;
+	return dev->vpd->ops->set_size(dev, len);
+}
+EXPORT_SYMBOL(pci_set_vpd_size);
+
 #define PCI_VPD_MAX_SIZE (PCI_VPD_ADDR_MASK + 1)
 
 /**
@@ -498,9 +511,23 @@ out:
 	return ret ? ret : count;
 }
 
+static int pci_vpd_set_size(struct pci_dev *dev, size_t len)
+{
+	struct pci_vpd *vpd = dev->vpd;
+
+	if (len == 0 || len > PCI_VPD_MAX_SIZE)
+		return -EIO;
+
+	vpd->valid = 1;
+	vpd->len = len;
+
+	return 0;
+}
+
 static const struct pci_vpd_ops pci_vpd_ops = {
 	.read = pci_vpd_read,
 	.write = pci_vpd_write,
+	.set_size = pci_vpd_set_size,
 };
 
 static ssize_t pci_vpd_f0_read(struct pci_dev *dev, loff_t pos, size_t count,
@@ -533,9 +560,24 @@ static ssize_t pci_vpd_f0_write(struct pci_dev *dev, loff_t pos, size_t count,
 	return ret;
 }
 
+static int pci_vpd_f0_set_size(struct pci_dev *dev, size_t len)
+{
+	struct pci_dev *tdev = pci_get_slot(dev->bus,
+					    PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
+	int ret;
+
+	if (!tdev)
+		return -ENODEV;
+
+	ret = pci_set_vpd_size(tdev, len);
+	pci_dev_put(tdev);
+	return ret;
+}
+
 static const struct pci_vpd_ops pci_vpd_f0_ops = {
 	.read = pci_vpd_f0_read,
 	.write = pci_vpd_f0_write,
+	.set_size = pci_vpd_f0_set_size,
 };
 
 int pci_vpd_init(struct pci_dev *dev)
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index d0fb934..a814bbb 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -97,6 +97,7 @@ static inline bool pci_has_subordinate(struct pci_dev *pci_dev)
 struct pci_vpd_ops {
 	ssize_t (*read)(struct pci_dev *dev, loff_t pos, size_t count, void *buf);
 	ssize_t (*write)(struct pci_dev *dev, loff_t pos, size_t count, const void *buf);
+	int (*set_size)(struct pci_dev *dev, size_t len);
 };
 
 struct pci_vpd {
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 004b813..932ec74 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1111,6 +1111,7 @@ void pci_unlock_rescan_remove(void);
 /* Vital product data routines */
 ssize_t pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf);
 ssize_t pci_write_vpd(struct pci_dev *dev, loff_t pos, size_t count, const void *buf);
+int pci_set_vpd_size(struct pci_dev *dev, size_t len);
 
 /* Helper functions for low-level code (drivers/pci/setup-[bus,res].c) */
 resource_size_t pcibios_retrieve_fw_addr(struct pci_dev *dev, int idx);

commit 67e658794ca191b3221b143f2a1c10d002c40bc8
Author: Hariprasad Shenai <hariprasad@chelsio.com>
Date:   Fri Apr 15 13:00:18 2016 -0500

    cxgb4: Set VPD size so we can read both VPD structures
    
    Chelsio adapters have two VPD structures stored in the VPD:
    
      - offset 0x000: an abbreviated VPD, and
      - offset 0x400: the complete VPD.
    
    After 104daa71b396 ("PCI: Determine actual VPD size on first access"), the
    PCI core computes the valid VPD size by parsing the VPD starting at offset
    0x0.  That size only includes the abbreviated VPD structure, so reads of
    the complete VPD at 0x400 fail.
    
    Explicitly set the VPD size with pci_set_vpd_size() so the driver can read
    both VPD structures.
    
    [bhelgaas: changelog, split patches, rename to pci_set_vpd_size() and
    return int (not ssize_t)]
    Fixes: 104daa71b396 ("PCI: Determine actual VPD size on first access")
    Tested-by: Steve Wise <swise@opengridcomputing.com>
    Signed-off-by: Casey Leedom <leedom@chelsio.com>
    Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
    Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
index cc1736b..c7efb11 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
@@ -2557,6 +2557,7 @@ void t4_get_regs(struct adapter *adap, void *buf, size_t buf_size)
 }
 
 #define EEPROM_STAT_ADDR   0x7bfc
+#define VPD_SIZE           0x800
 #define VPD_BASE           0x400
 #define VPD_BASE_OLD       0
 #define VPD_LEN            1024
@@ -2594,6 +2595,15 @@ int t4_get_raw_vpd_params(struct adapter *adapter, struct vpd_params *p)
 	if (!vpd)
 		return -ENOMEM;
 
+	/* We have two VPD data structures stored in the adapter VPD area.
+	 * By default, Linux calculates the size of the VPD area by traversing
+	 * the first VPD area at offset 0x0, so we need to tell the OS what
+	 * our real VPD size is.
+	 */
+	ret = pci_set_vpd_size(adapter->pdev, VPD_SIZE);
+	if (ret < 0)
+		goto out;
+
 	/* Card information normally starts at VPD_BASE but early cards had
 	 * it at 0.
 	 */
