From de77b966ce8adcb4c58d50e2f087320d5479812a Mon Sep 17 00:00:00 2001 From: yuan linyu Date: Sun, 18 Jun 2017 22:48:17 +0800 Subject: net: introduce __skb_put_[zero, data, u8] follow Johannes Berg, semantic patch file as below, @@ identifier p, p2; expression len; expression skb; type t, t2; @@ ( -p = __skb_put(skb, len); +p = __skb_put_zero(skb, len); | -p = (t)__skb_put(skb, len); +p = __skb_put_zero(skb, len); ) ... when != p ( p2 = (t2)p; -memset(p2, 0, len); | -memset(p, 0, len); ) @@ identifier p; expression len; expression skb; type t; @@ ( -t p = __skb_put(skb, len); +t p = __skb_put_zero(skb, len); ) ... when != p ( -memset(p, 0, len); ) @@ type t, t2; identifier p, p2; expression skb; @@ t *p; ... ( -p = __skb_put(skb, sizeof(t)); +p = __skb_put_zero(skb, sizeof(t)); | -p = (t *)__skb_put(skb, sizeof(t)); +p = __skb_put_zero(skb, sizeof(t)); ) ... when != p ( p2 = (t2)p; -memset(p2, 0, sizeof(*p)); | -memset(p, 0, sizeof(*p)); ) @@ expression skb, len; @@ -memset(__skb_put(skb, len), 0, len); +__skb_put_zero(skb, len); @@ expression skb, len, data; @@ -memcpy(__skb_put(skb, len), data, len); +__skb_put_data(skb, data, len); @@ expression SKB, C, S; typedef u8; identifier fn = {__skb_put}; fresh identifier fn2 = fn ## "_u8"; @@ - *(u8 *)fn(SKB, S) = C; + fn2(SKB, C); Signed-off-by: yuan linyu Signed-off-by: David S. Miller --- net/bluetooth/bnep/core.c | 15 ++++++--------- net/bluetooth/bnep/netdev.c | 12 ++++++------ 2 files changed, 12 insertions(+), 15 deletions(-) (limited to 'net/bluetooth') diff --git a/net/bluetooth/bnep/core.c b/net/bluetooth/bnep/core.c index fbf251fef70f..9a40013da915 100644 --- a/net/bluetooth/bnep/core.c +++ b/net/bluetooth/bnep/core.c @@ -374,25 +374,22 @@ static int bnep_rx_frame(struct bnep_session *s, struct sk_buff *skb) /* Decompress header and construct ether frame */ switch (type & BNEP_TYPE_MASK) { case BNEP_COMPRESSED: - memcpy(__skb_put(nskb, ETH_HLEN), &s->eh, ETH_HLEN); + __skb_put_data(nskb, &s->eh, ETH_HLEN); break; case BNEP_COMPRESSED_SRC_ONLY: - memcpy(__skb_put(nskb, ETH_ALEN), s->eh.h_dest, ETH_ALEN); - memcpy(__skb_put(nskb, ETH_ALEN), skb_mac_header(skb), ETH_ALEN); + __skb_put_data(nskb, s->eh.h_dest, ETH_ALEN); + __skb_put_data(nskb, skb_mac_header(skb), ETH_ALEN); put_unaligned(s->eh.h_proto, (__be16 *) __skb_put(nskb, 2)); break; case BNEP_COMPRESSED_DST_ONLY: - memcpy(__skb_put(nskb, ETH_ALEN), skb_mac_header(skb), - ETH_ALEN); - memcpy(__skb_put(nskb, ETH_ALEN + 2), s->eh.h_source, - ETH_ALEN + 2); + __skb_put_data(nskb, skb_mac_header(skb), ETH_ALEN); + __skb_put_data(nskb, s->eh.h_source, ETH_ALEN + 2); break; case BNEP_GENERAL: - memcpy(__skb_put(nskb, ETH_ALEN * 2), skb_mac_header(skb), - ETH_ALEN * 2); + __skb_put_data(nskb, skb_mac_header(skb), ETH_ALEN * 2); put_unaligned(s->eh.h_proto, (__be16 *) __skb_put(nskb, 2)); break; } diff --git a/net/bluetooth/bnep/netdev.c b/net/bluetooth/bnep/netdev.c index 2b875edf77e1..1d4d7d415730 100644 --- a/net/bluetooth/bnep/netdev.c +++ b/net/bluetooth/bnep/netdev.c @@ -75,16 +75,16 @@ static void bnep_net_set_mc_list(struct net_device *dev) u8 start[ETH_ALEN] = { 0x01 }; /* Request all addresses */ - memcpy(__skb_put(skb, ETH_ALEN), start, ETH_ALEN); - memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN); + __skb_put_data(skb, start, ETH_ALEN); + __skb_put_data(skb, dev->broadcast, ETH_ALEN); r->len = htons(ETH_ALEN * 2); } else { struct netdev_hw_addr *ha; int i, len = skb->len; if (dev->flags & IFF_BROADCAST) { - memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN); - memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN); + __skb_put_data(skb, dev->broadcast, ETH_ALEN); + __skb_put_data(skb, dev->broadcast, ETH_ALEN); } /* FIXME: We should group addresses here. */ @@ -93,8 +93,8 @@ static void bnep_net_set_mc_list(struct net_device *dev) netdev_for_each_mc_addr(ha, dev) { if (i == BNEP_MAX_MULTICAST_FILTERS) break; - memcpy(__skb_put(skb, ETH_ALEN), ha->addr, ETH_ALEN); - memcpy(__skb_put(skb, ETH_ALEN), ha->addr, ETH_ALEN); + __skb_put_data(skb, ha->addr, ETH_ALEN); + __skb_put_data(skb, ha->addr, ETH_ALEN); i++; } -- cgit v1.2.1