linux-kernel - [PATCH] net: af_packet: Don't initialize vnet

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Message-Id: <18a010357eb63dfd50751c5eb529f6261cf90ecd.1305232529.git.joe@perches.com>
Date:	Thu, 12 May 2011 13:36:10 -0700
From:	Joe Perches <joe@...ches.com>
To:	linux-kernel@...r.kernel.org
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: [PATCH] net: af_packet: Don't initialize vnet_hdr

Save a memset, initialize only the portion necessary.

packet_snd either gets this structure completely from
memcpy_fromiovec or uses only the hdr_len set to 0,
so don't always initialize the structure to 0.

Signed-off-by: Joe Perches <joe@...ches.com>
---
 net/packet/af_packet.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 549527b..ac88df9 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1123,7 +1123,7 @@ static int packet_snd(struct socket *sock,
 	__be16 proto;
 	unsigned char *addr;
 	int ifindex, err, reserve = 0;
-	struct virtio_net_hdr vnet_hdr = { 0 };
+	struct virtio_net_hdr vnet_hdr;
 	int offset = 0;
 	int vnet_hdr_len;
 	struct packet_sock *po = pkt_sk(sk);
@@ -1206,7 +1206,9 @@ static int packet_snd(struct socket *sock,
 				goto out_unlock;

 		}
-	}
+	} else
+		vnet_hdr.hdr_len = 0;
+

 	err = -EMSGSIZE;
 	if (!gso_type && (len > dev->mtu + reserve + VLAN_HLEN))
-- 
1.7.5.rc3.dirty

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