pci: Add VPD information field helper functions

This patch adds a preprocessor constant to describe the PCI VPD
information field header size and an inline function to extract the
size of the information field itself.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 76ad141ab448..f59f36910e98 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -12604,9 +12604,9 @@ static void __devinit tg3_read_partno(struct tg3 *tp)
                 while (i < (block_end - 2)) {
                         if (vpd_data[i + 0] == 'P' &&
                             vpd_data[i + 1] == 'N') {
-                                int partno_len = vpd_data[i + 2];
+                                int partno_len = pci_vpd_info_field_size(&vpd_data[i]);
 
-                                i += 3;
+                                i += PCI_VPD_INFO_FLD_HDR_SIZE;
                                 if (partno_len > TG3_BPN_SIZE ||
                                     (partno_len + i) > TG3_NVM_VPD_LEN)
                                         goto out_not_found;
@@ -12617,7 +12617,8 @@ static void __devinit tg3_read_partno(struct tg3 *tp)
                                 /* Success. */
                                 return;
                         }
-                        i += 3 + vpd_data[i + 2];
+                        i += PCI_VPD_INFO_FLD_HDR_SIZE +
+                             pci_vpd_info_field_size(&vpd_data[i]);
                 }
 
                 /* Part number not found. */