[src/trunk]: src/sys/dev/pci PR kern/52039: use same safeguard as for the 82578

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

details:   https://anonhg.NetBSD.org/src/rev/437f56c07e63
branches:  trunk
changeset: 822219:437f56c07e63
user:      kardel <kardel%NetBSD.org@localhost>
date:      Wed Mar 08 08:00:09 2017 +0000

description:
PR kern/52039: use same safeguard as for the 82578

diffstat:

 sys/dev/pci/if_wm.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (27 lines):

diff -r f2a3fdad4cd5 -r 437f56c07e63 sys/dev/pci/if_wm.c
--- a/sys/dev/pci/if_wm.c       Wed Mar 08 07:45:11 2017 +0000
+++ b/sys/dev/pci/if_wm.c       Wed Mar 08 08:00:09 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_wm.c,v 1.496 2017/03/03 16:48:55 knakahara Exp $    */
+/*     $NetBSD: if_wm.c,v 1.497 2017/03/08 08:00:09 kardel Exp $       */
 
 /*
  * Copyright (c) 2001, 2002, 2003, 2004 Wasabi Systems, Inc.
@@ -84,7 +84,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_wm.c,v 1.496 2017/03/03 16:48:55 knakahara Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_wm.c,v 1.497 2017/03/08 08:00:09 kardel Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_net_mpsafe.h"
@@ -13178,7 +13178,7 @@
 
                        /* Assume that the PHY is copper */
                        child = LIST_FIRST(&sc->sc_mii.mii_phys);
-                       if (child->mii_mpd_rev <= 2)
+                       if ((child != NULL) && (child->mii_mpd_rev <= 2))
                                sc->sc_mii.mii_writereg(sc->sc_dev, 1,
                                    (768 << 5) | 25, 0x0444); /* magic num */
                }