Rhubarb Pie

I love rhubarb, and really love rhubarb pie.  Decided to Google "Rhubarb Pie" the other day and came up with a zillion recipes.  By the time I finished reading all the instructions and looked at at the pictures I went back to my favorite old recipe.  This recipe is 35 years old that I know of, because that's how long I've used it.

6-8 servings
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3 cups diced rhubarb
1 cup sugar
3 tablespoons flour

1 cup rolled oats (not instant)
1/2 cup flour
1/2 cup sugar
1/2 teaspoon cinnamon