org-src-ask-before-returning-to-edit-buffer

org-src-ask-before-returning-to-edit-buffer is a variable defined in `org-src.el'.
Its value is

t

Documentation:
If nil, when org-edit-src code is used on a block that already
has an active edit buffer, it will switch to that edit buffer
immediately; otherwise it will ask whether you want to return to
the existing edit buffer.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.4 of Emacs.