# $Id: openbsd-adb_lockup.diff,v 1.1 2004/02/06 01:53:42 jcs Exp $
#
# for some reason, the adb controller on my powerbook starts acknowledging
# events (mouse movements and keystrokes) too slowly and fills up its internal
# queue of 32 events.  when this condition happens, adb_pass_up() just ignores
# new events while not clearing its queue, making the keyboard and mouse stop
# responding until a reboot.
#
# this hack clears the queue when it becomes full and moves the error reporting
# out of an '#ifdef'.
#
# note: this did not completely fix the problem on my 15" powerbook
#
# by joshua stein <jcs@jcs.org>
#

Index: adb_direct.c
===================================================================
RCS file: /cvs/src/sys/arch/macppc/dev/adb_direct.c,v
retrieving revision 1.10
diff -u -r1.10 adb_direct.c
--- adb_direct.c	3 Nov 2003 06:43:02 -0000	1.10
+++ adb_direct.c	5 Feb 2004 21:32:49 -0000
@@ -664,10 +664,24 @@
 	/*u_char *comprout = 0;*/
 
 	if (adbInCount >= ADB_QUEUE) {
-#ifdef ADB_DEBUG
-		if (adb_debug)
-			printf_intr("adb: ring buffer overflow\n");
-#endif
+		int s;
+
+		printf_intr("adb: ring buffer overflow");
+
+		/* reset the queue */
+		s = splhigh();
+		adbInCount = 0;
+		adbInHead = 0;
+		adbInTail = 0;
+		adbWaitingCmd = 0;
+		adbWaiting = 0;
+		adbBuffer = (long)0;
+		adbCompRout = (long)0;
+		adbCompData = (long)0;
+		splx(s);
+
+		printf_intr(", emptied queue\n");
+
 		return;
 	}