--- zaptel.c.ori 2005-01-10 17:28:49.635373128 -0500
+++ zaptel.c 2005-01-10 17:30:19.848658624 -0500
@@ -4096,7 +4096,9 @@
                /* if no span, just do nothing */
                if (!chan->span) return(0);
                /* if dialing, stop it */
+ spin_lock_irqsave(&chan->lock, flags);
                chan->curtone = NULL;
+ spin_unlock_irqrestore(&chan->lock, flags);
                chan->dialing = 0;
                chan->txdialbuf[0] = '\0';
                chan->tonep = 0;