A note on CSP rings

Let $R$ be an associative ring. $R$ is called right CSP if the sum of any two closed right ideals of $R$ is also a closed right ideal of $R$. Left CSP rings can be defined similarly. It is shown that a matrix ring over a right CSP ring may not be right CSP. And $\mathbb{M}_{2}(R)$ is right CSP if and only if $R$ is right self-injective and von Neumann regular. This informs that a left CSP ring may not be right CSP. At last, an equivalent characterization is given for the trivial extension $R\propto R$ of $R$ to be right CSP.