Problem with serial.c introduced in 2.4.15

[Christian Asam]

After having found out that a too old kernel caused my problem with 
writing to slow devices I had the problem that my serial digitizer 
(Genius using gpm/genitizer) didn't work with 2.4.18. I tracked it down 
to a change made in 1.4.15:
drivers/char/serial.c:
#if 0   /*
         * !!! ignore all characters if CREAD is not set
         */
        if ((cflag & CREAD) == 0)
                info->ignore_status_mask |= UART_LSR_DR;
#endif

In 2.4.15 the #if 0 and #endif was removed and somehow that manages to 
break gpm/genitizer. I then added the #if 0/#endif to "remove" that 
statement in 2.4.18 and the tablet works with 2.4.18 too.

cu