Hello Fengguang, Xiaolong

I've noticed that the serial output you sometimes provide has repeating
lines (double lines). Is this intentional? we are about to push a patch
set to the linux-next that fixes "double printing" issue and I'm wondering
will it break anything on your side. Can you please test it?

1/3  https://marc.info/?l=linux-kernel&m=148957402019729&w=2
2/3  https://marc.info/?l=linux-kernel&m=148957403319736&w=2
3/3  https://marc.info/?l=linux-kernel&m=149142366508431&w=2

I've also attached the patches.

	-ss