[src/trunk]: src/sys/rump/net/lib/libshmif sauce previous with a comment

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

details:   https://anonhg.NetBSD.org/src/rev/62156698a6a2
branches:  trunk
changeset: 787378:62156698a6a2
user:      pooka <pooka%NetBSD.org@localhost>
date:      Fri Jun 14 05:59:50 2013 +0000

description:
sauce previous with a comment

diffstat:

 sys/rump/net/lib/libshmif/if_shmem.c |  8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diffs (29 lines):

diff -r 3362cbad7af6 -r 62156698a6a2 sys/rump/net/lib/libshmif/if_shmem.c
--- a/sys/rump/net/lib/libshmif/if_shmem.c      Fri Jun 14 05:56:29 2013 +0000
+++ b/sys/rump/net/lib/libshmif/if_shmem.c      Fri Jun 14 05:59:50 2013 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_shmem.c,v 1.55 2013/06/14 05:56:29 pooka Exp $      */
+/*     $NetBSD: if_shmem.c,v 1.56 2013/06/14 05:59:50 pooka Exp $      */
 
 /*
  * Copyright (c) 2009, 2010 Antti Kantee.  All Rights Reserved.
@@ -28,7 +28,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_shmem.c,v 1.55 2013/06/14 05:56:29 pooka Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_shmem.c,v 1.56 2013/06/14 05:59:50 pooka Exp $");
 
 #include <sys/param.h>
 #include <sys/atomic.h>
@@ -724,6 +724,10 @@
                            sc, sc->sc_devgen));
                }
 
+               /*
+                * Ignore packets too short to possibly be valid.
+                * This is hit at least for the first frame on a new bus.
+                */
                if (__predict_false(sp.sp_len < ETHER_HDR_LEN)) {
                        DPRINTF(("shmif read packet len %d < ETHER_HDR_LEN\n",
                            sp.sp_len));