Try adding the following two lines:

JG>func proc far
        PUSH DS;<--------------------------------------
JG>     mov  ax,_DATA   ;my driver's data section
JG>     mov  ds,ax
JG>     mov  ax,_var    ;_var is located in the driver's data section
JG>     stc
        POP  DS;<--------------------------------------
JG>     retf
JG>func endp

JG>   So, do you have any idea what's going on here, and how I can access the
JG>driver's data section within the function?

You can't change the DS register safely unless you restore it before
exiting.
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