igb: make dev_spec a union and remove dynamic allocation

This patch makes dev_spec a union and simplifies it so that it does not
require dynamic allocation and freeing in the driver.
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/igb/e1000_82575.c

@@ -62,17 +62,12 @@ static bool igb_sgmii_active_82575(struct e1000_hw *);
 static s32  igb_reset_init_script_82575(struct e1000_hw *);
 static s32  igb_read_mac_addr_82575(struct e1000_hw *);
 
-
-struct e1000_dev_spec_82575 {
-	bool sgmii_active;
-};
-
 static s32 igb_get_invariants_82575(struct e1000_hw *hw)
 {
 	struct e1000_phy_info *phy = &hw->phy;
 	struct e1000_nvm_info *nvm = &hw->nvm;
 	struct e1000_mac_info *mac = &hw->mac;
-	struct e1000_dev_spec_82575 *dev_spec;
+	struct e1000_dev_spec_82575 * dev_spec = &hw->dev_spec._82575;
 	u32 eecd;
 	s32 ret_val;
 	u16 size;
@@ -94,17 +89,6 @@ static s32 igb_get_invariants_82575(struct e1000_hw *hw)
 		break;
 	}
 
-	/* MAC initialization */
-	hw->dev_spec_size = sizeof(struct e1000_dev_spec_82575);
-
-	/* Device-specific structure allocation */
-	hw->dev_spec = kzalloc(hw->dev_spec_size, GFP_KERNEL);
-
-	if (!hw->dev_spec)
-		return -ENOMEM;
-
-	dev_spec = (struct e1000_dev_spec_82575 *)hw->dev_spec;
-
 	/* Set media type */
 	/*
 	 * The 82575 uses bits 22:23 for link mode. The mode can be changed
@@ -1234,20 +1218,12 @@ out:
  **/
 static bool igb_sgmii_active_82575(struct e1000_hw *hw)
 {
-	struct e1000_dev_spec_82575 *dev_spec;
-	bool ret_val;
+	struct e1000_dev_spec_82575 *dev_spec = &hw->dev_spec._82575;
 
-	if (hw->mac.type != e1000_82575) {
-		ret_val = false;
-		goto out;
-	}
-
-	dev_spec = (struct e1000_dev_spec_82575 *)hw->dev_spec;
+	if (hw->mac.type != e1000_82575 && hw->mac.type != e1000_82576)
+		return false;
 
-	ret_val = dev_spec->sgmii_active;
-
-out:
-	return ret_val;
+	return dev_spec->sgmii_active;
 }
 
 /**

drivers/net/igb/e1000_hw.h

@@ -565,9 +565,12 @@ struct e1000_fc_info {
 	enum e1000_fc_type original_type;
 };
 
+struct e1000_dev_spec_82575 {
+	bool sgmii_active;
+};
+
 struct e1000_hw {
 	void *back;
-	void *dev_spec;
 
 	u8 __iomem *hw_addr;
 	u8 __iomem *flash_address;
@@ -580,7 +583,9 @@ struct e1000_hw {
 	struct e1000_bus_info  bus;
 	struct e1000_host_mng_dhcp_cookie mng_cookie;
 
-	u32 dev_spec_size;
+	union {
+		struct e1000_dev_spec_82575	_82575;
+	} dev_spec;
 
 	u16 device_id;
 	u16 subsystem_vendor_id;

drivers/net/igb/e1000_mac.c

@@ -37,19 +37,6 @@
 static s32 igb_set_default_fc(struct e1000_hw *hw);
 static s32 igb_set_fc_watermarks(struct e1000_hw *hw);
 
-/**
- *  igb_remove_device - Free device specific structure
- *  @hw: pointer to the HW structure
- *
- *  If a device specific structure was allocated, this function will
- *  free it.
- **/
-void igb_remove_device(struct e1000_hw *hw)
-{
-	/* Freeing the dev_spec member of e1000_hw structure */
-	kfree(hw->dev_spec);
-}
-
 static s32 igb_read_pcie_cap_reg(struct e1000_hw *hw, u32 reg, u16 *value)
 {
 	struct igb_adapter *adapter = hw->back;

drivers/net/igb/e1000_mac.h

@@ -63,7 +63,6 @@ void igb_mta_set(struct e1000_hw *hw, u32 hash_value);
 void igb_put_hw_semaphore(struct e1000_hw *hw);
 void igb_rar_set(struct e1000_hw *hw, u8 *addr, u32 index);
 s32  igb_check_alt_mac_addr(struct e1000_hw *hw);
-void igb_remove_device(struct e1000_hw *hw);
 void igb_reset_adaptive(struct e1000_hw *hw);
 void igb_update_adaptive(struct e1000_hw *hw);
 void igb_write_vfta(struct e1000_hw *hw, u32 offset, u32 value);

drivers/net/igb/igb_main.c

@@ -1329,7 +1329,6 @@ err_eeprom:
 	if (hw->flash_address)
 		iounmap(hw->flash_address);
 
-	igb_remove_device(hw);
 	igb_free_queues(adapter);
 err_sw_init:
 err_hw_init:
@@ -1389,7 +1388,6 @@ static void __devexit igb_remove(struct pci_dev *pdev)
 	if (!igb_check_reset_block(&adapter->hw))
 		igb_reset_phy(&adapter->hw);
 
-	igb_remove_device(&adapter->hw);
 	igb_reset_interrupt_capability(adapter);
 
 	igb_free_queues(adapter);