[src/trunk]: src/sys/dev/pci Add NULL check for TAILQ_FIRST

[ozaki-r <ozaki-r%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/cdec7b60fe55
branches:  trunk
changeset: 337957:cdec7b60fe55
user:      ozaki-r <ozaki-r%NetBSD.org@localhost>
date:      Mon May 04 14:02:13 2015 +0000

description:
Add NULL check for TAILQ_FIRST

diffstat:

 sys/dev/pci/viomb.c |  6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diffs (27 lines):

diff -r c8251925069f -r cdec7b60fe55 sys/dev/pci/viomb.c
--- a/sys/dev/pci/viomb.c       Mon May 04 12:23:15 2015 +0000
+++ b/sys/dev/pci/viomb.c       Mon May 04 14:02:13 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: viomb.c,v 1.3 2014/07/22 01:55:54 ozaki-r Exp $        */
+/*     $NetBSD: viomb.c,v 1.4 2015/05/04 14:02:13 ozaki-r Exp $        */
 
 /*
  * Copyright (c) 2010 Minoura Makoto.
@@ -26,7 +26,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: viomb.c,v 1.3 2014/07/22 01:55:54 ozaki-r Exp $");
+__KERNEL_RCSID(0, "$NetBSD: viomb.c,v 1.4 2015/05/04 14:02:13 ozaki-r Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -383,6 +383,8 @@
        TAILQ_INIT(&b->bl_pglist);
        for (i = 0; i < nhpages; i++) {
                p = TAILQ_FIRST(&sc->sc_balloon_pages);
+               if (p == NULL)
+                       break;
                TAILQ_REMOVE(&sc->sc_balloon_pages, p, pageq.queue);
                TAILQ_INSERT_TAIL(&b->bl_pglist, p, pageq.queue);
                b->bl_pages[i] = p->phys_addr / VIRTIO_PAGE_SIZE;