1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/net/smsc9420.c b/drivers/net/smsc9420.c
index da8b977a5357..17560dbcc7ad 100644
--- a/drivers/net/smsc9420.c
+++ b/drivers/net/smsc9420.c
@@ -341,7 +341,7 @@ static int smsc9420_eeprom_send_cmd(struct smsc9420_pdata *pd, u32 op)
         do {
                 msleep(1);
                 e2cmd = smsc9420_reg_read(pd, E2P_CMD);
-        } while ((e2cmd & E2P_CMD_EPC_BUSY_) && (timeout--));
+        } while ((e2cmd & E2P_CMD_EPC_BUSY_) && (--timeout));
 
         if (!timeout) {
                 smsc_info(HW, "TIMED OUT");
@@ -413,6 +413,7 @@ static int smsc9420_ethtool_get_eeprom(struct net_device *dev,
         }
 
         memcpy(data, &eeprom_data[eeprom->offset], len);
+        eeprom->magic = SMSC9420_EEPROM_MAGIC;
         eeprom->len = len;
         return 0;
 }
@@ -423,6 +424,9 @@ static int smsc9420_ethtool_set_eeprom(struct net_device *dev,
         struct smsc9420_pdata *pd = netdev_priv(dev);
         int ret;
 
+        if (eeprom->magic != SMSC9420_EEPROM_MAGIC)
+                return -EINVAL;
+
         smsc9420_eeprom_enable_access(pd);
         smsc9420_eeprom_send_cmd(pd, E2P_CMD_EPC_CMD_EWEN_);
         ret = smsc9420_eeprom_write_location(pd, eeprom->offset, *data);