git submodule 如何push代碼

某git項目關聯了一個submodule 如何更新該項目下的submodule

https://stackoverflow.com/questions/5814319/git-submodule-push

$ cd your_submodule
$ git checkout master
$ git commit -a -m "commit in submodule"
$ git push
$ cd ..
$ git add your_submodule
$ git commit -m "Updated submodule"