+static int i2c_transfer_rollball(struct i2c_adapter *i2c,
+				 struct i2c_msg *msgs, int num)
+{
+	u8 saved_page;
+	int ret;
+
+	i2c_lock_bus(i2c, I2C_LOCK_SEGMENT);
+
+	/* save original page */
+	ret = __i2c_rollball_get_page(i2c, msgs->addr, &saved_page);
+	if (ret)
+		goto unlock;
+
+	/* change to RollBall MDIO page */
+	ret = __i2c_rollball_set_page(i2c, msgs->addr, SFP_PAGE_ROLLBALL_MDIO);
+	if (ret)
+		goto unlock;
+
+	/* do the transfer */
+	ret = __i2c_transfer_err(i2c, msgs, num);
+	if (ret)
+		goto unlock;

If get page and set page worked, and you get an error in during the
actual data transfer, i wonder if you should try restoring the page
before returning with the error?

+
+	/* restore original page */
+	ret = __i2c_rollball_set_page(i2c, msgs->addr, saved_page);
+
+unlock:
+	i2c_unlock_bus(i2c, I2C_LOCK_SEGMENT);
+
+	return ret;
+}