[src/trunk]: src/sys/rump/librump/rumpkern Ignore errors when copyin/out len ...

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

details:   https://anonhg.NetBSD.org/src/rev/017e69b7ebdc
branches:  trunk
changeset: 756463:017e69b7ebdc
user:      pooka <pooka%NetBSD.org@localhost>
date:      Sun Jul 18 12:44:31 2010 +0000

description:
Ignore errors when copyin/out len == 0.

diffstat:

 sys/rump/librump/rumpkern/rumpcopy.c |  10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)

diffs (40 lines):

diff -r b4346d81139c -r 017e69b7ebdc sys/rump/librump/rumpkern/rumpcopy.c
--- a/sys/rump/librump/rumpkern/rumpcopy.c      Sun Jul 18 12:44:09 2010 +0000
+++ b/sys/rump/librump/rumpkern/rumpcopy.c      Sun Jul 18 12:44:31 2010 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: rumpcopy.c,v 1.4 2010/07/12 21:00:47 pooka Exp $       */
+/*     $NetBSD: rumpcopy.c,v 1.5 2010/07/18 12:44:31 pooka Exp $       */
 
 /*
  * Copyright (c) 2009 Antti Kantee.  All Rights Reserved.
@@ -26,7 +26,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: rumpcopy.c,v 1.4 2010/07/12 21:00:47 pooka Exp $");
+__KERNEL_RCSID(0, "$NetBSD: rumpcopy.c,v 1.5 2010/07/18 12:44:31 pooka Exp $");
 
 #include <sys/param.h>
 #include <sys/lwp.h>
@@ -41,8 +41,9 @@
 {
 
        if (curproc->p_vmspace == &vmspace0) {
-               if (uaddr == NULL)
+               if (__predict_false(uaddr == NULL && len)) {
                        return EFAULT;
+               }
                memcpy(kaddr, uaddr, len);
        } else {
                rump_sysproxy_copyin(uaddr, kaddr, len);
@@ -55,8 +56,9 @@
 {
 
        if (curproc->p_vmspace == &vmspace0) {
-               if (uaddr == NULL)
+               if (__predict_false(uaddr == NULL && len)) {
                        return EFAULT;
+               }
                memcpy(uaddr, kaddr, len);
        } else {
                rump_sysproxy_copyout(kaddr, uaddr, len);