6lowpan: iphc: fix invalid case handling

This patch fixes the return value in a case which should never occur.
Instead returning "-EINVAL" we return LOWPAN_IPHC_DAM_00 which is
invalid on context based addresses. Also change the WARN_ON_ONCE to
WARN_ONCE which was suggested by Dan Carpenter.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Alexander Aring <aar@pengutronix.de>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/6lowpan/iphc.c b/net/6lowpan/iphc.c
index 06287ac03211..72172514fea0 100644
--- a/net/6lowpan/iphc.c
+++ b/net/6lowpan/iphc.c
@@ -811,8 +811,8 @@ static u8 lowpan_compress_ctx_addr(u8 **hc_ptr, const struct in6_addr *ipaddr,
                 goto out;
         }
 
-        WARN_ON_ONCE("context found but no address mode matched\n");
-        return -EINVAL;
+        WARN_ONCE(1, "context found but no address mode matched\n");
+        return LOWPAN_IPHC_DAM_00;
 out:
 
         if (sam)