[PATCH] ixgb: Invalidate software cache, when EEPROM write occurs

Added code to invalidate software cache, when a write is made to the EEPROM.
Signed-off-by: Mallikarjuna R Chilakala <mallikarjuna.chilakala@intel.com>
Signed-off-by: Ganesh Venkatesan <ganesh.venkatesan@intel.com>
Signed-off-by: John Ronciak <john.ronciak@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

drivers/net/ixgb/ixgb_ee.c

@@ -372,10 +372,10 @@ ixgb_update_eeprom_checksum(struct ixgb_hw *hw)
  *
  *****************************************************************************/
 void
-ixgb_write_eeprom(struct ixgb_hw *hw,
-		   uint16_t offset,
-		   uint16_t data)
+ixgb_write_eeprom(struct ixgb_hw *hw, uint16_t offset, uint16_t data)
 {
+	struct ixgb_ee_map_type *ee_map = (struct ixgb_ee_map_type *)hw->eeprom;
+
 	/* Prepare the EEPROM for writing */
 	ixgb_setup_eeprom(hw);
 
@@ -410,6 +410,9 @@ ixgb_write_eeprom(struct ixgb_hw *hw,
 	/*  Done with writing  */
 	ixgb_cleanup_eeprom(hw);
 
+	/* clear the init_ctrl_reg_1 to signify that the cache is invalidated */
+	ee_map->init_ctrl_reg_1 = EEPROM_ICW1_SIGNATURE_CLEAR;
+
 	return;
 }
 
@@ -478,6 +481,9 @@ ixgb_get_eeprom_data(struct ixgb_hw *hw)
 
 	if (checksum != (uint16_t) EEPROM_SUM) {
 		DEBUGOUT("ixgb_ee: Checksum invalid.\n");
+		/* clear the init_ctrl_reg_1 to signify that the cache is
+		 * invalidated */
+		ee_map->init_ctrl_reg_1 = EEPROM_ICW1_SIGNATURE_CLEAR;
 		return (FALSE);
 	}
 

drivers/net/ixgb/ixgb_ee.h

@@ -63,6 +63,7 @@
 
 #define EEPROM_ICW1_SIGNATURE_MASK  0xC000
 #define EEPROM_ICW1_SIGNATURE_VALID 0x4000
+#define EEPROM_ICW1_SIGNATURE_CLEAR 0x0000
 
 /* For checksumming, the sum of all words in the EEPROM should equal 0xBABA. */
 #define EEPROM_SUM 0xBABA