siointr1: Schedule soft interrupt when needed. This fixes the "no

interrupt" problem people had seen with SMPng.

Approved by:       jasone
Tested by:         bp

sys/dev/sio/sio.c

@@ -1980,6 +1980,8 @@ siointr1(com)
 /* XXX - needs to go away when alpha gets ithreads */
 #ifdef __alpha__
 				schedsofttty();
+#else
+				setsofttty();
 #endif
 #if 0 /* for testing input latency vs efficiency */
 if (com->iptr - com->ibuf == 8)

sys/isa/sio.c

@@ -1980,6 +1980,8 @@ siointr1(com)
 /* XXX - needs to go away when alpha gets ithreads */
 #ifdef __alpha__
 				schedsofttty();
+#else
+				setsofttty();
 #endif
 #if 0 /* for testing input latency vs efficiency */
 if (com->iptr - com->ibuf == 8)