e1000e: cleanup: do not assign a variable a value when not necessary

Static analysis with cppcheck has shown a few instances of a variable
being reassigned a value before the old one has been used.  None of these
ever require the old value to be used so remove the old values.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/e1000e/80003es2lan.c

@@ -695,7 +695,7 @@ static s32 e1000_phy_force_speed_duplex_80003es2lan(struct e1000_hw *hw)
 static s32 e1000_get_cable_length_80003es2lan(struct e1000_hw *hw)
 {
 	struct e1000_phy_info *phy = &hw->phy;
-	s32 ret_val = 0;
+	s32 ret_val;
 	u16 phy_data, index;
 
 	ret_val = e1e_rphy(hw, GG82563_PHY_DSP_DISTANCE, &phy_data);
@@ -1276,7 +1276,7 @@ static s32 e1000_read_kmrn_reg_80003es2lan(struct e1000_hw *hw, u32 offset,
 					   u16 *data)
 {
 	u32 kmrnctrlsta;
-	s32 ret_val = 0;
+	s32 ret_val;
 
 	ret_val = e1000_acquire_mac_csr_80003es2lan(hw);
 	if (ret_val)
@@ -1311,7 +1311,7 @@ static s32 e1000_write_kmrn_reg_80003es2lan(struct e1000_hw *hw, u32 offset,
 					    u16 data)
 {
 	u32 kmrnctrlsta;
-	s32 ret_val = 0;
+	s32 ret_val;
 
 	ret_val = e1000_acquire_mac_csr_80003es2lan(hw);
 	if (ret_val)
@@ -1335,7 +1335,7 @@ static s32 e1000_write_kmrn_reg_80003es2lan(struct e1000_hw *hw, u32 offset,
  **/
 static s32 e1000_read_mac_addr_80003es2lan(struct e1000_hw *hw)
 {
-	s32 ret_val = 0;
+	s32 ret_val;
 
 	/* If there's an alternate MAC address place it in RAR0
 	 * so that it will override the Si installed default perm

drivers/net/ethernet/intel/e1000e/82571.c

@@ -1397,7 +1397,7 @@ bool e1000_check_phy_82574(struct e1000_hw *hw)
 {
 	u16 status_1kbt = 0;
 	u16 receive_errors = 0;
-	s32 ret_val = 0;
+	s32 ret_val;
 
 	/* Read PHY Receive Error counter first, if its is max - all F's then
 	 * read the Base1000T status register If both are max then PHY is hung.
@@ -1542,7 +1542,7 @@ static s32 e1000_check_for_serdes_link_82571(struct e1000_hw *hw)
 
 	ctrl = er32(CTRL);
 	status = er32(STATUS);
-	rxcw = er32(RXCW);
+	er32(RXCW);
 	/* SYNCH bit and IV bit are sticky */
 	udelay(10);
 	rxcw = er32(RXCW);
@@ -1812,7 +1812,7 @@ static s32 e1000_fix_nvm_checksum_82571(struct e1000_hw *hw)
 static s32 e1000_read_mac_addr_82571(struct e1000_hw *hw)
 {
 	if (hw->mac.type == e1000_82571) {
-		s32 ret_val = 0;
+		s32 ret_val;
 
 		/* If there's an alternate MAC address place it in RAR0
 		 * so that it will override the Si installed default perm

drivers/net/ethernet/intel/e1000e/ethtool.c

@@ -1405,7 +1405,7 @@ static int e1000_set_82571_fiber_loopback(struct e1000_adapter *adapter)
 {
 	struct e1000_hw *hw = &adapter->hw;
 	u32 ctrl = er32(CTRL);
-	int link = 0;
+	int link;
 
 	/* special requirements for 82571/82572 fiber adapters */
 

drivers/net/ethernet/intel/e1000e/ich8lan.c

@@ -485,7 +485,7 @@ out:
 static s32 e1000_init_phy_params_pchlan(struct e1000_hw *hw)
 {
 	struct e1000_phy_info *phy = &hw->phy;
-	s32 ret_val = 0;
+	s32 ret_val;
 
 	phy->addr                     = 1;
 	phy->reset_delay_us           = 100;
@@ -783,7 +783,7 @@ static s32 e1000_init_mac_params_ich8lan(struct e1000_hw *hw)
 static s32 __e1000_access_emi_reg_locked(struct e1000_hw *hw, u16 address,
 					 u16 *data, bool read)
 {
-	s32 ret_val = 0;
+	s32 ret_val;
 
 	ret_val = e1e_wphy_locked(hw, I82579_EMI_ADDR, address);
 	if (ret_val)
@@ -1387,7 +1387,7 @@ static s32 e1000_write_smbus_addr(struct e1000_hw *hw)
 	u32 strap = er32(STRAP);
 	u32 freq = (strap & E1000_STRAP_SMT_FREQ_MASK) >>
 	    E1000_STRAP_SMT_FREQ_SHIFT;
-	s32 ret_val = 0;
+	s32 ret_val;
 
 	strap &= E1000_STRAP_SMBUS_ADDRESS_MASK;
 
@@ -1623,7 +1623,7 @@ release:
  **/
 s32 e1000_configure_k1_ich8lan(struct e1000_hw *hw, bool k1_enable)
 {
-	s32 ret_val = 0;
+	s32 ret_val;
 	u32 ctrl_reg = 0;
 	u32 ctrl_ext = 0;
 	u32 reg = 0;
@@ -2284,7 +2284,7 @@ static s32 e1000_phy_hw_reset_ich8lan(struct e1000_hw *hw)
  **/
 static s32 e1000_set_lplu_state_pchlan(struct e1000_hw *hw, bool active)
 {
-	s32 ret_val = 0;
+	s32 ret_val;
 	u16 oem_reg;
 
 	ret_val = e1e_rphy(hw, HV_OEM_BITS, &oem_reg);

drivers/net/ethernet/intel/e1000e/mac.c

@@ -165,7 +165,7 @@ void e1000e_init_rx_addrs(struct e1000_hw *hw, u16 rar_count)
 s32 e1000_check_alt_mac_addr_generic(struct e1000_hw *hw)
 {
 	u32 i;
-	s32 ret_val = 0;
+	s32 ret_val;
 	u16 offset, nvm_alt_mac_addr_offset, nvm_data;
 	u8 alt_mac_addr[ETH_ALEN];
 

drivers/net/ethernet/intel/e1000e/netdev.c

@@ -3660,8 +3660,8 @@ static int e1000e_config_hwtstamp(struct e1000_adapter *adapter)
 	e1e_flush();
 
 	/* Clear TSYNCRXCTL_VALID & TSYNCTXCTL_VALID bit */
-	regval = er32(RXSTMPH);
-	regval = er32(TXSTMPH);
+	er32(RXSTMPH);
+	er32(TXSTMPH);
 
 	/* Get and set the System Time Register SYSTIM base frequency */
 	ret_val = e1000e_get_base_timinca(adapter, &regval);
@@ -5834,7 +5834,7 @@ static int e1000_init_phy_wakeup(struct e1000_adapter *adapter, u32 wufc)
 	struct e1000_hw *hw = &adapter->hw;
 	u32 i, mac_reg;
 	u16 phy_reg, wuc_enable;
-	int retval = 0;
+	int retval;
 
 	/* copy MAC RARs to PHY RARs */
 	e1000_copy_rx_addrs_to_phy_ich8lan(hw);

drivers/net/ethernet/intel/e1000e/phy.c

@@ -2671,7 +2671,7 @@ s32 e1000_enable_phy_wakeup_reg_access_bm(struct e1000_hw *hw, u16 *phy_reg)
  **/
 s32 e1000_disable_phy_wakeup_reg_access_bm(struct e1000_hw *hw, u16 *phy_reg)
 {
-	s32 ret_val = 0;
+	s32 ret_val;
 
 	/* Select Port Control Registers page */
 	ret_val = e1000_set_page_igp(hw, (BM_PORT_CTRL_PAGE << IGP_PAGE_SHIFT));
@@ -3103,8 +3103,8 @@ static s32 e1000_access_phy_debug_regs_hv(struct e1000_hw *hw, u32 offset,
                                           u16 *data, bool read)
 {
 	s32 ret_val;
-	u32 addr_reg = 0;
-	u32 data_reg = 0;
+	u32 addr_reg;
+	u32 data_reg;
 
 	/* This takes care of the difference with desktop vs mobile phy */
 	addr_reg = (hw->phy.type == e1000_phy_82578) ?