I found this problem on a MIPS machine. The problem is likely to happen on other register-rich RISC arches too. cmdcnt needs to be volatile since it is modified by irq routine and read by normal process context. Jun
diff -Nru linux/drivers/input/mouse/psmouse.h.orig linux/drivers/input/mouse/psmouse.h --- linux/drivers/input/mouse/psmouse.h.orig 2004-04-16 15:28:47.000000000 -0700 +++ linux/drivers/input/mouse/psmouse.h 2004-06-15 18:51:53.000000000 -0700 @@ -40,7 +40,7 @@ char *name; unsigned char cmdbuf[8]; unsigned char packet[8]; - unsigned char cmdcnt; + volatile unsigned char cmdcnt; unsigned char pktcnt; unsigned char type; unsigned char model;
