Modifying the param() routine

The param( ) routine is typically used to set features such as the baud rate of the card. In the example, the card is told that a command is ready to go; turning off the flag has to be protected:

   s = tc_tlock(tp);                    /* replacing oldspl = spl7();  */
   /*
   *
   * If other parts of the driver set/clear this flag,
   * then it also needs protection
   *
   */
   xx->command |= 1;                 /*  control bit to I/O card   */
   tc_tunlock(tp,s);                 /* replacing splx(oldspl); */