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From: Maksim Yevmenkin <emax@FreeBSD.org>
Date: Fri, 17 Apr 2009 00:30:56 +0000 (UTC)
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Subject: svn commit: r191164 - head/sys/dev/atkbdc
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Author: emax
Date: Fri Apr 17 00:30:56 2009
New Revision: 191164
URL: http://svn.freebsd.org/changeset/base/191164

Log:
  Prevent atkbd(4) interrupt handler from calling keyboard callback function
  when polled mode is enabled. This should help with duplicated/missing
  characters problem at mountroot, geli, etc. prompts on multi CPU systems
  while kbdmux(4) is enabled.
  
  Tested by:	Tobias Grosser <grosser -at- fim -dot- uni-passau -dot- de>
  Tested by:	Fabian Keil <freebsd-listen -at- fabiankeil -dot- de>
  MFC after:	3 days

Modified:
  head/sys/dev/atkbdc/atkbd.c

Modified: head/sys/dev/atkbdc/atkbd.c
==============================================================================
--- head/sys/dev/atkbdc/atkbd.c	Thu Apr 16 23:42:00 2009	(r191163)
+++ head/sys/dev/atkbdc/atkbd.c	Fri Apr 17 00:30:56 2009	(r191164)
@@ -476,7 +476,7 @@ atkbd_term(keyboard_t *kbd)
 static int
 atkbd_intr(keyboard_t *kbd, void *arg)
 {
-	atkbd_state_t *state;
+	atkbd_state_t *state = (atkbd_state_t *)kbd->kb_data;
 	int delay[2];
 	int c;
 
@@ -485,7 +485,6 @@ atkbd_intr(keyboard_t *kbd, void *arg)
 		 * The keyboard was not detected before;
 		 * it must have been reconnected!
 		 */
-		state = (atkbd_state_t *)kbd->kb_data;
 		init_keyboard(state->kbdc, &kbd->kb_type,
 			      kbd->kb_config);
 		KBD_FOUND_DEVICE(kbd);
@@ -496,6 +495,9 @@ atkbd_intr(keyboard_t *kbd, void *arg)
 		atkbd_ioctl(kbd, KDSETREPEAT, (caddr_t)delay);
 	}
 
+	if (state->ks_polling)
+		return 0;
+
 	if (KBD_IS_ACTIVE(kbd) && KBD_IS_BUSY(kbd)) {
 		/* let the callback function to process the input */
 		(*kbd->kb_callback.kc_func)(kbd, KBDIO_KEYINPUT,