[IPV4]: Fix ip command line processing.

Recently the documentation in Documentation/nfsroot.txt was
update to note that in fact ip=off and ip=::::::off as the
latter is ignored and the default (on) is used.

This was certainly a step in the direction of reducing confusion.
But it seems to me that the code ought to be fixed up so that
ip=::::::off actually turns off ip autoconfiguration.

This patch also notes more specifically that ip=on (aka ip=::::::on)
is the default.

Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 6 deletions

diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
index 96400b0bd08..420f56ad59f 100644
--- a/net/ipv4/ipconfig.c
+++ b/net/ipv4/ipconfig.c
@@ -1403,6 +1403,10 @@ static int __init ic_proto_name(char *name)
         if (!strcmp(name, "on") || !strcmp(name, "any")) {
                 return 1;
         }
+        if (!strcmp(name, "off") || !strcmp(name, "none")) {
+                ic_enable = 0;
+                return 1;
+        }
 #ifdef CONFIG_IP_PNP_DHCP
         else if (!strcmp(name, "dhcp")) {
                 ic_proto_enabled &= ~IC_RARP;
@@ -1437,12 +1441,6 @@ static int __init ip_auto_config_setup(char *addrs)
 
         ic_set_manually = 1;
 
-        ic_enable = (*addrs &&
-                (strcmp(addrs, "off") != 0) &&
-                (strcmp(addrs, "none") != 0));
-        if (!ic_enable)
-                return 1;
-
         if (ic_proto_name(addrs))
                 return 1;