tg3: Read VPD with pci_vpd_alloc()

Use pci_vpd_alloc() to dynamically allocate a properly sized buffer and
read the full VPD data into it.

This simplifies the code, and we no longer have to make assumptions about
VPD size.

Link: https://lore.kernel.org/r/bd3cd19c-b74f-9704-5786-476bf35ab5de@gmail.com
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index b0e4964..779b100 100644 (file)
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -12791,7 +12791,7 @@ static void tg3_get_ethtool_stats(struct net_device *dev,
                memset(tmp_stats, 0, sizeof(struct tg3_ethtool_stats));
 }
 
-static __be32 *tg3_vpd_readblock(struct tg3 *tp, u32 *vpdlen)
+static __be32 *tg3_vpd_readblock(struct tg3 *tp, unsigned int *vpdlen)
 {
        int i;
        __be32 *buf;
@@ -12825,15 +12825,11 @@ static __be32 *tg3_vpd_readblock(struct tg3 *tp, u32 *vpdlen)
                        offset = TG3_NVM_VPD_OFF;
                        len = TG3_NVM_VPD_LEN;
                }
-       } else {
-               len = TG3_NVM_PCI_VPD_MAX_LEN;
-       }
 
-       buf = kmalloc(len, GFP_KERNEL);
-       if (buf == NULL)
-               return NULL;
+               buf = kmalloc(len, GFP_KERNEL);
+               if (!buf)
+                       return NULL;
 
-       if (magic == TG3_EEPROM_MAGIC) {
                for (i = 0; i < len; i += 4) {
                        /* The data is in little-endian format in NVRAM.
                         * Use the big-endian read routines to preserve
@@ -12844,12 +12840,9 @@ static __be32 *tg3_vpd_readblock(struct tg3 *tp, u32 *vpdlen)
                }
                *vpdlen = len;
        } else {
-               ssize_t cnt;
-
-               cnt = pci_read_vpd(tp->pdev, 0, len, (u8 *)buf);
-               if (cnt < 0)
-                       goto error;
-               *vpdlen = cnt;
+               buf = pci_vpd_alloc(tp->pdev, vpdlen);
+               if (IS_ERR(buf))
+                       return NULL;
        }
 
        return buf;
@@ -12871,9 +12864,10 @@ error:
 
 static int tg3_test_nvram(struct tg3 *tp)
 {
-       u32 csum, magic, len;
+       u32 csum, magic;
        __be32 *buf;
        int i, j, k, err = 0, size;
+       unsigned int len;
 
        if (tg3_flag(tp, NO_NVRAM))
                return 0;
@@ -15621,8 +15615,7 @@ skip_phy_reset:
 static void tg3_read_vpd(struct tg3 *tp)
 {
        u8 *vpd_data;
-       unsigned int block_end, rosize, len;
-       u32 vpdlen;
+       unsigned int block_end, rosize, len, vpdlen;
        int j, i = 0;
 
        vpd_data = (u8 *)tg3_vpd_readblock(tp, &vpdlen);

diff --git a/drivers/net/ethernet/broadcom/tg3.h b/drivers/net/ethernet/broadcom/tg3.h
index 46ec4fd..1000c89 100644 (file)
--- a/drivers/net/ethernet/broadcom/tg3.h
+++ b/drivers/net/ethernet/broadcom/tg3.h
@@ -2101,7 +2101,6 @@
 /* Hardware Legacy NVRAM layout */
 #define TG3_NVM_VPD_OFF                        0x100
 #define TG3_NVM_VPD_LEN                        256
-#define TG3_NVM_PCI_VPD_MAX_LEN                512
 
 /* Hardware Selfboot NVRAM layout */
 #define TG3_NVM_HWSB_CFG1              0x00000004