[src/trunk]: src/sys/arch/macppc/macppc avoid races in mp_save_{fpu, vec}_proc...

[chs <chs%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/e7e693275479
branches:  trunk
changeset: 534899:e7e693275479
user:      chs <chs%NetBSD.org@localhost>
date:      Tue Aug 06 06:16:04 2002 +0000

description:
avoid races in mp_save_{fpu,vec}_proc() where the other CPU
dumps the state out from under us.

diffstat:

 sys/arch/macppc/macppc/machdep.c |  8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diffs (29 lines):

diff -r 62c2ad51ba9a -r e7e693275479 sys/arch/macppc/macppc/machdep.c
--- a/sys/arch/macppc/macppc/machdep.c  Tue Aug 06 06:14:33 2002 +0000
+++ b/sys/arch/macppc/macppc/machdep.c  Tue Aug 06 06:16:04 2002 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: machdep.c,v 1.117 2002/07/28 07:07:46 chs Exp $        */
+/*     $NetBSD: machdep.c,v 1.118 2002/08/06 06:16:04 chs Exp $        */
 
 /*
  * Copyright (C) 1995, 1996 Wolfgang Solfrank.
@@ -697,6 +697,9 @@
         */
 
        fpcpu = pcb->pcb_fpcpu;
+       if (fpcpu == NULL) {
+               return;
+       }
        macppc_send_ipi(fpcpu, MACPPC_IPI_FLUSH_FPU);
 
        /* Wait for flush. */
@@ -737,6 +740,9 @@
         */
 
        veccpu = pcb->pcb_veccpu;
+       if (veccpu == NULL) {
+               return;
+       }
        macppc_send_ipi(veccpu, MACPPC_IPI_FLUSH_VEC);
 
        /* Wait for flush. */