Please do submit it. Bonus points if you can make it work like BSD's random/urandom, i.e. block until the entropy estimator says "OK, it's secure to use now", but never block thereafter.
EDIT to add: Frankly, it's a disgrace that Linux doesn't already do this, instead choosing to push the burden of getting all the details right to userspace where you can be vulnerable to all sorts of interesting timing attacks, FD-based DoS, etc.
EDIT to add: Frankly, it's a disgrace that Linux doesn't already do this, instead choosing to push the burden of getting all the details right to userspace where you can be vulnerable to all sorts of interesting timing attacks, FD-based DoS, etc.