In a large skillet, warm the oil over medium heat. Add the mushrooms and garlic and sauté until the mushrooms begin to soften. Add the soy sauce and ginger. Mix well. Raise heat to medium-high and cook for 3 more minutes.
Mix in the salmon, adding more soy sauce to taste. Add the cooked pasta and stir well. Cook for 2 more minutes, stirring constantly. Serve hot.