pci: Add helper to find a VPD resource data type

This patch adds the pci_vpd_find_tag() helper function to find VPD
resource data types in a buffer.

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, 5 insertions, 21 deletions

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index ed57a62b3ac8..76ad141ab448 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -12547,7 +12547,7 @@ skip_phy_reset:
 static void __devinit tg3_read_partno(struct tg3 *tp)
 {
         unsigned char vpd_data[TG3_NVM_VPD_LEN];   /* in little-endian format */
-        unsigned int i;
+        int i;
         u32 magic;
 
         if ((tp->tg3_flags3 & TG3_FLG3_NO_NVRAM) ||
@@ -12586,28 +12586,12 @@ static void __devinit tg3_read_partno(struct tg3 *tp)
 
         /* Now parse and find the part number. */
         for (i = 0; i < TG3_NVM_VPD_LEN - 2; ) {
-                unsigned char val = vpd_data[i];
                 unsigned int block_end;
 
-                if (val & PCI_VPD_LRDT) {
-                        if (i + PCI_VPD_LRDT_TAG_SIZE > TG3_NVM_VPD_LEN)
-                                break;
-
-                        if (val != PCI_VPD_LRDT_RO_DATA) {
-                                i += PCI_VPD_LRDT_TAG_SIZE +
-                                     pci_vpd_lrdt_size(&vpd_data[i]);
-
-                                continue;
-                        }
-                } else {
-                        if ((val & PCI_VPD_SRDT_TIN_MASK) == PCI_VPD_STIN_END)
-                                break;
-
-                        i += PCI_VPD_SRDT_TAG_SIZE +
-                             pci_vpd_srdt_size(&vpd_data[i]);
-
-                        continue;
-                }
+                i = pci_vpd_find_tag(vpd_data, i, TG3_NVM_VPD_LEN,
+                                     PCI_VPD_LRDT_RO_DATA);
+                if (i < 0)
+                        break;
 
                 block_end = i + PCI_VPD_LRDT_TAG_SIZE +
                             pci_vpd_lrdt_size(&vpd_data[i]);