From 16c5dcb13a371feae0e680e6518775b5335b37d8 Mon Sep 17 00:00:00 2001 From: Florian Fainelli Date: Sat, 8 Apr 2017 08:55:22 -0700 Subject: [PATCH] net: dsa: Move skb_unshare() to dsa_switch_rcv() All DSA tag receive functions need to unshare the skb before mangling it, move this to the generic dsa_switch_rcv() function which will allow us to make the tag receive function return their mangled skb without caring about freeing a NULL skb. Signed-off-by: Florian Fainelli Signed-off-by: David S. Miller --- net/dsa/dsa.c | 4 ++++ net/dsa/tag_brcm.c | 5 ----- net/dsa/tag_dsa.c | 5 ----- net/dsa/tag_edsa.c | 5 ----- net/dsa/tag_mtk.c | 5 ----- net/dsa/tag_qca.c | 5 ----- net/dsa/tag_trailer.c | 5 ----- 7 files changed, 4 insertions(+), 30 deletions(-) diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c index 6cad15da5892..d370c8bfa372 100644 --- a/net/dsa/dsa.c +++ b/net/dsa/dsa.c @@ -906,6 +906,10 @@ static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev, return 0; } + skb = skb_unshare(skb, GFP_ATOMIC); + if (!skb) + return 0; + return dst->rcv(skb, dev, pt, orig_dev); } diff --git a/net/dsa/tag_brcm.c b/net/dsa/tag_brcm.c index 68d4feef96d4..263941769c88 100644 --- a/net/dsa/tag_brcm.c +++ b/net/dsa/tag_brcm.c @@ -102,10 +102,6 @@ static int brcm_tag_rcv(struct sk_buff *skb, struct net_device *dev, ds = dst->cpu_switch; - skb = skb_unshare(skb, GFP_ATOMIC); - if (skb == NULL) - goto out; - if (unlikely(!pskb_may_pull(skb, BRCM_TAG_LEN))) goto out_drop; @@ -151,7 +147,6 @@ static int brcm_tag_rcv(struct sk_buff *skb, struct net_device *dev, out_drop: kfree_skb(skb); -out: return 0; } diff --git a/net/dsa/tag_dsa.c b/net/dsa/tag_dsa.c index 377569c0e4f7..b7032699eaad 100644 --- a/net/dsa/tag_dsa.c +++ b/net/dsa/tag_dsa.c @@ -77,10 +77,6 @@ static int dsa_rcv(struct sk_buff *skb, struct net_device *dev, int source_device; int source_port; - skb = skb_unshare(skb, GFP_ATOMIC); - if (skb == NULL) - goto out; - if (unlikely(!pskb_may_pull(skb, DSA_HLEN))) goto out_drop; @@ -175,7 +171,6 @@ static int dsa_rcv(struct sk_buff *skb, struct net_device *dev, out_drop: kfree_skb(skb); -out: return 0; } diff --git a/net/dsa/tag_edsa.c b/net/dsa/tag_edsa.c index 30520ff9c9a2..b87009672b40 100644 --- a/net/dsa/tag_edsa.c +++ b/net/dsa/tag_edsa.c @@ -90,10 +90,6 @@ static int edsa_rcv(struct sk_buff *skb, struct net_device *dev, int source_device; int source_port; - skb = skb_unshare(skb, GFP_ATOMIC); - if (skb == NULL) - goto out; - if (unlikely(!pskb_may_pull(skb, EDSA_HLEN))) goto out_drop; @@ -194,7 +190,6 @@ static int edsa_rcv(struct sk_buff *skb, struct net_device *dev, out_drop: kfree_skb(skb); -out: return 0; } diff --git a/net/dsa/tag_mtk.c b/net/dsa/tag_mtk.c index 836c311a3c38..d0a477084870 100644 --- a/net/dsa/tag_mtk.c +++ b/net/dsa/tag_mtk.c @@ -55,10 +55,6 @@ static int mtk_tag_rcv(struct sk_buff *skb, struct net_device *dev, int port; __be16 *phdr, hdr; - skb = skb_unshare(skb, GFP_ATOMIC); - if (!skb) - goto out; - if (unlikely(!pskb_may_pull(skb, MTK_HDR_LEN))) goto out_drop; @@ -105,7 +101,6 @@ static int mtk_tag_rcv(struct sk_buff *skb, struct net_device *dev, out_drop: kfree_skb(skb); -out: return 0; } diff --git a/net/dsa/tag_qca.c b/net/dsa/tag_qca.c index 6579d6db1bc6..d1324649808c 100644 --- a/net/dsa/tag_qca.c +++ b/net/dsa/tag_qca.c @@ -75,10 +75,6 @@ static int qca_tag_rcv(struct sk_buff *skb, struct net_device *dev, int port; __be16 *phdr, hdr; - skb = skb_unshare(skb, GFP_ATOMIC); - if (!skb) - goto out; - if (unlikely(!pskb_may_pull(skb, QCA_HDR_LEN))) goto out_drop; @@ -126,7 +122,6 @@ static int qca_tag_rcv(struct sk_buff *skb, struct net_device *dev, out_drop: kfree_skb(skb); -out: return 0; } diff --git a/net/dsa/tag_trailer.c b/net/dsa/tag_trailer.c index f5c764ee2968..1fc0b221a70f 100644 --- a/net/dsa/tag_trailer.c +++ b/net/dsa/tag_trailer.c @@ -68,10 +68,6 @@ static int trailer_rcv(struct sk_buff *skb, struct net_device *dev, ds = dst->cpu_switch; - skb = skb_unshare(skb, GFP_ATOMIC); - if (skb == NULL) - goto out; - if (skb_linearize(skb)) goto out_drop; @@ -100,7 +96,6 @@ static int trailer_rcv(struct sk_buff *skb, struct net_device *dev, out_drop: kfree_skb(skb); -out: return 0; }