intel: handle unused assignments

Remove variables that were storing a return value from a register
read or other read, where the return value wasn't used. Those
conversions to remove the lvalue of the assignment should be safe
because the readl memory mapped reads are marked volatile and
should not be optimized out without an lvalue (I suspect a very
long time ago this wasn't guaranteed as it is today).

These changes are part of a separate patch to make it easier to review.

Warnings Fixed:
.../intel/e100.c:2596:9: warning: variable ‘err’ set but not used [-Wunused-but-set-variable]
.../intel/ixgb/ixgb_hw.c:101:6: warning: variable ‘icr_reg’ set but not used [-Wunused-but-set-variable]
.../intel/ixgb/ixgb_hw.c:277:6: warning: variable ‘ctrl_reg’ set but not used [-Wunused-but-set-variable]
.../intel/ixgb/ixgb_hw.c:952:15: warning: variable ‘temp_reg’ set but not used [-Wunused-but-set-variable]
.../intel/ixgb/ixgb_hw.c:1164:7: warning: variable ‘mdio_reg’ set but not used [-Wunused-but-set-variable]
.../intel/e1000/e1000_hw.c:132:6: warning: variable ‘ret_val’ set but not used [-Wunused-but-set-variable]
.../intel/e1000/e1000_hw.c:380:6: warning: variable ‘icr’ set but not used [-Wunused-but-set-variable]
.../intel/e1000/e1000_hw.c:2378:6: warning: variable ‘signal’ set but not used [-Wunused-but-set-variable]
.../intel/e1000/e1000_hw.c:2374:6: warning: variable ‘ctrl’ set but not used [-Wunused-but-set-variable]
.../intel/e1000/e1000_hw.c:2373:6: warning: variable ‘rxcw’ set but not used [-Wunused-but-set-variable]
.../intel/e1000/e1000_hw.c:4678:15: warning: variable ‘temp’ set but not used [-Wunused-but-set-variable]
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/intel/e100.c

@@ -2593,7 +2593,7 @@ static void e100_diag_test(struct net_device *netdev,
 {
 	struct ethtool_cmd cmd;
 	struct nic *nic = netdev_priv(netdev);
-	int i, err;
+	int i;
 
 	memset(data, 0, E100_TEST_LEN * sizeof(u64));
 	data[0] = !mii_link_ok(&nic->mii);
@@ -2601,7 +2601,7 @@ static void e100_diag_test(struct net_device *netdev,
 	if (test->flags & ETH_TEST_FL_OFFLINE) {
 
 		/* save speed, duplex & autoneg settings */
-		err = mii_ethtool_gset(&nic->mii, &cmd);
+		mii_ethtool_gset(&nic->mii, &cmd);
 
 		if (netif_running(netdev))
 			e100_down(nic);
@@ -2610,7 +2610,7 @@ static void e100_diag_test(struct net_device *netdev,
 		data[4] = e100_loopback_test(nic, lb_phy);
 
 		/* restore speed, duplex & autoneg settings */
-		err = mii_ethtool_sset(&nic->mii, &cmd);
+		mii_ethtool_sset(&nic->mii, &cmd);
 
 		if (netif_running(netdev))
 			e100_up(nic);

drivers/net/ethernet/intel/e1000/e1000_hw.c

@@ -376,7 +376,6 @@ s32 e1000_reset_hw(struct e1000_hw *hw)
 {
 	u32 ctrl;
 	u32 ctrl_ext;
-	u32 icr;
 	u32 manc;
 	u32 led_ctrl;
 	s32 ret_val;
@@ -501,7 +500,7 @@ s32 e1000_reset_hw(struct e1000_hw *hw)
 	ew32(IMC, 0xffffffff);
 
 	/* Clear any pending interrupt events. */
-	icr = er32(ICR);
+	er32(ICR);
 
 	/* If MWI was previously enabled, reenable it. */
 	if (hw->mac_type == e1000_82542_rev2_0) {
@@ -2368,16 +2367,13 @@ static s32 e1000_check_for_serdes_link_generic(struct e1000_hw *hw)
  */
 s32 e1000_check_for_link(struct e1000_hw *hw)
 {
-	u32 rxcw = 0;
-	u32 ctrl;
 	u32 status;
 	u32 rctl;
 	u32 icr;
-	u32 signal = 0;
 	s32 ret_val;
 	u16 phy_data;
 
-	ctrl = er32(CTRL);
+	er32(CTRL);
 	status = er32(STATUS);
 
 	/* On adapters with a MAC newer than 82544, SW Definable pin 1 will be
@@ -2386,12 +2382,9 @@ s32 e1000_check_for_link(struct e1000_hw *hw)
 	 */
 	if ((hw->media_type == e1000_media_type_fiber) ||
 	    (hw->media_type == e1000_media_type_internal_serdes)) {
-		rxcw = er32(RXCW);
+		er32(RXCW);
 
 		if (hw->media_type == e1000_media_type_fiber) {
-			signal =
-			    (hw->mac_type >
-			     e1000_82544) ? E1000_CTRL_SWDPIN1 : 0;
 			if (status & E1000_STATUS_LU)
 				hw->get_link_status = false;
 		}
@@ -4673,78 +4666,76 @@ s32 e1000_led_off(struct e1000_hw *hw)
  */
 static void e1000_clear_hw_cntrs(struct e1000_hw *hw)
 {
-	volatile u32 temp;
-
-	temp = er32(CRCERRS);
-	temp = er32(SYMERRS);
-	temp = er32(MPC);
-	temp = er32(SCC);
-	temp = er32(ECOL);
-	temp = er32(MCC);
-	temp = er32(LATECOL);
-	temp = er32(COLC);
-	temp = er32(DC);
-	temp = er32(SEC);
-	temp = er32(RLEC);
-	temp = er32(XONRXC);
-	temp = er32(XONTXC);
-	temp = er32(XOFFRXC);
-	temp = er32(XOFFTXC);
-	temp = er32(FCRUC);
-
-	temp = er32(PRC64);
-	temp = er32(PRC127);
-	temp = er32(PRC255);
-	temp = er32(PRC511);
-	temp = er32(PRC1023);
-	temp = er32(PRC1522);
-
-	temp = er32(GPRC);
-	temp = er32(BPRC);
-	temp = er32(MPRC);
-	temp = er32(GPTC);
-	temp = er32(GORCL);
-	temp = er32(GORCH);
-	temp = er32(GOTCL);
-	temp = er32(GOTCH);
-	temp = er32(RNBC);
-	temp = er32(RUC);
-	temp = er32(RFC);
-	temp = er32(ROC);
-	temp = er32(RJC);
-	temp = er32(TORL);
-	temp = er32(TORH);
-	temp = er32(TOTL);
-	temp = er32(TOTH);
-	temp = er32(TPR);
-	temp = er32(TPT);
-
-	temp = er32(PTC64);
-	temp = er32(PTC127);
-	temp = er32(PTC255);
-	temp = er32(PTC511);
-	temp = er32(PTC1023);
-	temp = er32(PTC1522);
-
-	temp = er32(MPTC);
-	temp = er32(BPTC);
+	er32(CRCERRS);
+	er32(SYMERRS);
+	er32(MPC);
+	er32(SCC);
+	er32(ECOL);
+	er32(MCC);
+	er32(LATECOL);
+	er32(COLC);
+	er32(DC);
+	er32(SEC);
+	er32(RLEC);
+	er32(XONRXC);
+	er32(XONTXC);
+	er32(XOFFRXC);
+	er32(XOFFTXC);
+	er32(FCRUC);
+
+	er32(PRC64);
+	er32(PRC127);
+	er32(PRC255);
+	er32(PRC511);
+	er32(PRC1023);
+	er32(PRC1522);
+
+	er32(GPRC);
+	er32(BPRC);
+	er32(MPRC);
+	er32(GPTC);
+	er32(GORCL);
+	er32(GORCH);
+	er32(GOTCL);
+	er32(GOTCH);
+	er32(RNBC);
+	er32(RUC);
+	er32(RFC);
+	er32(ROC);
+	er32(RJC);
+	er32(TORL);
+	er32(TORH);
+	er32(TOTL);
+	er32(TOTH);
+	er32(TPR);
+	er32(TPT);
+
+	er32(PTC64);
+	er32(PTC127);
+	er32(PTC255);
+	er32(PTC511);
+	er32(PTC1023);
+	er32(PTC1522);
+
+	er32(MPTC);
+	er32(BPTC);
 
 	if (hw->mac_type < e1000_82543)
 		return;
 
-	temp = er32(ALGNERRC);
-	temp = er32(RXERRC);
-	temp = er32(TNCRS);
-	temp = er32(CEXTERR);
-	temp = er32(TSCTC);
-	temp = er32(TSCTFC);
+	er32(ALGNERRC);
+	er32(RXERRC);
+	er32(TNCRS);
+	er32(CEXTERR);
+	er32(TSCTC);
+	er32(TSCTFC);
 
 	if (hw->mac_type <= e1000_82544)
 		return;
 
-	temp = er32(MGTPRC);
-	temp = er32(MGTPDC);
-	temp = er32(MGTPTC);
+	er32(MGTPRC);
+	er32(MGTPDC);
+	er32(MGTPTC);
 }
 
 /**

drivers/net/ethernet/intel/ixgb/ixgb_hw.c

@@ -98,7 +98,6 @@ bool
 ixgb_adapter_stop(struct ixgb_hw *hw)
 {
 	u32 ctrl_reg;
-	u32 icr_reg;
 
 	ENTER();
 
@@ -142,7 +141,7 @@ ixgb_adapter_stop(struct ixgb_hw *hw)
 	IXGB_WRITE_REG(hw, IMC, 0xffffffff);
 
 	/* Clear any pending interrupt events. */
-	icr_reg = IXGB_READ_REG(hw, ICR);
+	IXGB_READ_REG(hw, ICR);
 
 	return ctrl_reg & IXGB_CTRL0_RST;
 }
@@ -274,7 +273,6 @@ bool
 ixgb_init_hw(struct ixgb_hw *hw)
 {
 	u32 i;
-	u32 ctrl_reg;
 	bool status;
 
 	ENTER();
@@ -286,7 +284,7 @@ ixgb_init_hw(struct ixgb_hw *hw)
 	 */
 	pr_debug("Issuing a global reset to MAC\n");
 
-	ctrl_reg = ixgb_mac_reset(hw);
+	ixgb_mac_reset(hw);
 
 	pr_debug("Issuing an EE reset to MAC\n");
 #ifdef HP_ZX1
@@ -949,8 +947,6 @@ bool ixgb_check_for_bad_link(struct ixgb_hw *hw)
 static void
 ixgb_clear_hw_cntrs(struct ixgb_hw *hw)
 {
-	volatile u32 temp_reg;
-
 	ENTER();
 
 	/* if we are stopped or resetting exit gracefully */
@@ -959,66 +955,66 @@ ixgb_clear_hw_cntrs(struct ixgb_hw *hw)
 		return;
 	}
 
-	temp_reg = IXGB_READ_REG(hw, TPRL);
-	temp_reg = IXGB_READ_REG(hw, TPRH);
-	temp_reg = IXGB_READ_REG(hw, GPRCL);
-	temp_reg = IXGB_READ_REG(hw, GPRCH);
-	temp_reg = IXGB_READ_REG(hw, BPRCL);
-	temp_reg = IXGB_READ_REG(hw, BPRCH);
-	temp_reg = IXGB_READ_REG(hw, MPRCL);
-	temp_reg = IXGB_READ_REG(hw, MPRCH);
-	temp_reg = IXGB_READ_REG(hw, UPRCL);
-	temp_reg = IXGB_READ_REG(hw, UPRCH);
-	temp_reg = IXGB_READ_REG(hw, VPRCL);
-	temp_reg = IXGB_READ_REG(hw, VPRCH);
-	temp_reg = IXGB_READ_REG(hw, JPRCL);
-	temp_reg = IXGB_READ_REG(hw, JPRCH);
-	temp_reg = IXGB_READ_REG(hw, GORCL);
-	temp_reg = IXGB_READ_REG(hw, GORCH);
-	temp_reg = IXGB_READ_REG(hw, TORL);
-	temp_reg = IXGB_READ_REG(hw, TORH);
-	temp_reg = IXGB_READ_REG(hw, RNBC);
-	temp_reg = IXGB_READ_REG(hw, RUC);
-	temp_reg = IXGB_READ_REG(hw, ROC);
-	temp_reg = IXGB_READ_REG(hw, RLEC);
-	temp_reg = IXGB_READ_REG(hw, CRCERRS);
-	temp_reg = IXGB_READ_REG(hw, ICBC);
-	temp_reg = IXGB_READ_REG(hw, ECBC);
-	temp_reg = IXGB_READ_REG(hw, MPC);
-	temp_reg = IXGB_READ_REG(hw, TPTL);
-	temp_reg = IXGB_READ_REG(hw, TPTH);
-	temp_reg = IXGB_READ_REG(hw, GPTCL);
-	temp_reg = IXGB_READ_REG(hw, GPTCH);
-	temp_reg = IXGB_READ_REG(hw, BPTCL);
-	temp_reg = IXGB_READ_REG(hw, BPTCH);
-	temp_reg = IXGB_READ_REG(hw, MPTCL);
-	temp_reg = IXGB_READ_REG(hw, MPTCH);
-	temp_reg = IXGB_READ_REG(hw, UPTCL);
-	temp_reg = IXGB_READ_REG(hw, UPTCH);
-	temp_reg = IXGB_READ_REG(hw, VPTCL);
-	temp_reg = IXGB_READ_REG(hw, VPTCH);
-	temp_reg = IXGB_READ_REG(hw, JPTCL);
-	temp_reg = IXGB_READ_REG(hw, JPTCH);
-	temp_reg = IXGB_READ_REG(hw, GOTCL);
-	temp_reg = IXGB_READ_REG(hw, GOTCH);
-	temp_reg = IXGB_READ_REG(hw, TOTL);
-	temp_reg = IXGB_READ_REG(hw, TOTH);
-	temp_reg = IXGB_READ_REG(hw, DC);
-	temp_reg = IXGB_READ_REG(hw, PLT64C);
-	temp_reg = IXGB_READ_REG(hw, TSCTC);
-	temp_reg = IXGB_READ_REG(hw, TSCTFC);
-	temp_reg = IXGB_READ_REG(hw, IBIC);
-	temp_reg = IXGB_READ_REG(hw, RFC);
-	temp_reg = IXGB_READ_REG(hw, LFC);
-	temp_reg = IXGB_READ_REG(hw, PFRC);
-	temp_reg = IXGB_READ_REG(hw, PFTC);
-	temp_reg = IXGB_READ_REG(hw, MCFRC);
-	temp_reg = IXGB_READ_REG(hw, MCFTC);
-	temp_reg = IXGB_READ_REG(hw, XONRXC);
-	temp_reg = IXGB_READ_REG(hw, XONTXC);
-	temp_reg = IXGB_READ_REG(hw, XOFFRXC);
-	temp_reg = IXGB_READ_REG(hw, XOFFTXC);
-	temp_reg = IXGB_READ_REG(hw, RJC);
+	IXGB_READ_REG(hw, TPRL);
+	IXGB_READ_REG(hw, TPRH);
+	IXGB_READ_REG(hw, GPRCL);
+	IXGB_READ_REG(hw, GPRCH);
+	IXGB_READ_REG(hw, BPRCL);
+	IXGB_READ_REG(hw, BPRCH);
+	IXGB_READ_REG(hw, MPRCL);
+	IXGB_READ_REG(hw, MPRCH);
+	IXGB_READ_REG(hw, UPRCL);
+	IXGB_READ_REG(hw, UPRCH);
+	IXGB_READ_REG(hw, VPRCL);
+	IXGB_READ_REG(hw, VPRCH);
+	IXGB_READ_REG(hw, JPRCL);
+	IXGB_READ_REG(hw, JPRCH);
+	IXGB_READ_REG(hw, GORCL);
+	IXGB_READ_REG(hw, GORCH);
+	IXGB_READ_REG(hw, TORL);
+	IXGB_READ_REG(hw, TORH);
+	IXGB_READ_REG(hw, RNBC);
+	IXGB_READ_REG(hw, RUC);
+	IXGB_READ_REG(hw, ROC);
+	IXGB_READ_REG(hw, RLEC);
+	IXGB_READ_REG(hw, CRCERRS);
+	IXGB_READ_REG(hw, ICBC);
+	IXGB_READ_REG(hw, ECBC);
+	IXGB_READ_REG(hw, MPC);
+	IXGB_READ_REG(hw, TPTL);
+	IXGB_READ_REG(hw, TPTH);
+	IXGB_READ_REG(hw, GPTCL);
+	IXGB_READ_REG(hw, GPTCH);
+	IXGB_READ_REG(hw, BPTCL);
+	IXGB_READ_REG(hw, BPTCH);
+	IXGB_READ_REG(hw, MPTCL);
+	IXGB_READ_REG(hw, MPTCH);
+	IXGB_READ_REG(hw, UPTCL);
+	IXGB_READ_REG(hw, UPTCH);
+	IXGB_READ_REG(hw, VPTCL);
+	IXGB_READ_REG(hw, VPTCH);
+	IXGB_READ_REG(hw, JPTCL);
+	IXGB_READ_REG(hw, JPTCH);
+	IXGB_READ_REG(hw, GOTCL);
+	IXGB_READ_REG(hw, GOTCH);
+	IXGB_READ_REG(hw, TOTL);
+	IXGB_READ_REG(hw, TOTH);
+	IXGB_READ_REG(hw, DC);
+	IXGB_READ_REG(hw, PLT64C);
+	IXGB_READ_REG(hw, TSCTC);
+	IXGB_READ_REG(hw, TSCTFC);
+	IXGB_READ_REG(hw, IBIC);
+	IXGB_READ_REG(hw, RFC);
+	IXGB_READ_REG(hw, LFC);
+	IXGB_READ_REG(hw, PFRC);
+	IXGB_READ_REG(hw, PFTC);
+	IXGB_READ_REG(hw, MCFRC);
+	IXGB_READ_REG(hw, MCFTC);
+	IXGB_READ_REG(hw, XONRXC);
+	IXGB_READ_REG(hw, XONTXC);
+	IXGB_READ_REG(hw, XOFFRXC);
+	IXGB_READ_REG(hw, XOFFTXC);
+	IXGB_READ_REG(hw, RJC);
 }
 
 /******************************************************************************
@@ -1161,18 +1157,13 @@ static void
 ixgb_optics_reset(struct ixgb_hw *hw)
 {
 	if (hw->phy_type == ixgb_phy_type_txn17401) {
-		u16 mdio_reg;
-
 		ixgb_write_phy_reg(hw,
 				   MDIO_CTRL1,
 				   IXGB_PHY_ADDRESS,
 				   MDIO_MMD_PMAPMD,
 				   MDIO_CTRL1_RESET);
 
-		mdio_reg = ixgb_read_phy_reg(hw,
-					     MDIO_CTRL1,
-					     IXGB_PHY_ADDRESS,
-					     MDIO_MMD_PMAPMD);
+		ixgb_read_phy_reg(hw, MDIO_CTRL1, IXGB_PHY_ADDRESS, MDIO_MMD_PMAPMD);
 	}
 }