[PATCH] Fix ALPS sync loss

[Dmitry Torokhov <dtor_core@ameritech.net>]

Hi,

Here is the promised patch. It turns out protocol validation code was
a bit (or rather a byte ;) ) off.

Please let me know if it fixes your touchpad and I believe it would be
nice to have it in 2.6.11.

-- 
Dmitry


===================================================================


ChangeSet@1.2147, 2005-02-08 18:12:06-05:00, dtor_core@ameritech.net
  Input: alps - fix protocol validation rules causing touchpad
         to lose sync if an absolute packet is received after
         a relative packet with negative Y displacement.
  
  Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
  


 alps.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)


===================================================================



diff -Nru a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
--- a/drivers/input/mouse/alps.c	2005-02-08 18:16:27 -05:00
+++ b/drivers/input/mouse/alps.c	2005-02-08 18:16:27 -05:00
@@ -198,8 +198,8 @@
 		return PSMOUSE_BAD_DATA;
 
 	/* Bytes 2 - 6 should have 0 in the highest bit */
-	if (psmouse->pktcnt > 1 && psmouse->pktcnt <= 6 &&
-	    (psmouse->packet[psmouse->pktcnt] & 0x80))
+	if (psmouse->pktcnt >= 2 && psmouse->pktcnt <= 6 &&
+	    (psmouse->packet[psmouse->pktcnt - 1] & 0x80))
 		return PSMOUSE_BAD_DATA;
 
 	if (psmouse->pktcnt == 6) {