netfilter: nft_byteorder: avoid unneeded le/be conversion steps

David points out that we to three le/be conversions instead
of just one.  Doesn't matter on x86_64 w. gcc, but other
architectures might be less lucky.

Since it also simplifies code just follow his advice.

Fixes: c0f3275f5cb ("nftables: byteorder: provide le/be 64 bit conversion helper")
Suggested-by: David Laight <David.Laight@aculab.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 2 insertions, 4 deletions

diff --git a/net/netfilter/nft_byteorder.c b/net/netfilter/nft_byteorder.c
index 383c17138399..b78c28ba465f 100644
--- a/net/netfilter/nft_byteorder.c
+++ b/net/netfilter/nft_byteorder.c
@@ -46,16 +46,14 @@ static void nft_byteorder_eval(const struct nft_expr *expr,
                 switch (priv->op) {
                 case NFT_BYTEORDER_NTOH:
                         for (i = 0; i < priv->len / 8; i++) {
-                                src64 = get_unaligned_be64(&src[i]);
-                                src64 = be64_to_cpu((__force __be64)src64);
+                                src64 = get_unaligned((u64 *)&src[i]);
                                 put_unaligned_be64(src64, &dst[i]);
                         }
                         break;
                 case NFT_BYTEORDER_HTON:
                         for (i = 0; i < priv->len / 8; i++) {
                                 src64 = get_unaligned_be64(&src[i]);
-                                src64 = (__force u64)cpu_to_be64(src64);
-                                put_unaligned_be64(src64, &dst[i]);
+                                put_unaligned(src64, (u64 *)&dst[i]);
                         }
                         break;
                 }