networking: introduce and use skb_put_data()

A common pattern with skb_put() is to just want to memcpy()
some data into the new space, introduce skb_put_data() for
this.

An spatch similar to the one for skb_put_zero() converts many
of the places using it:

    @@
    identifier p, p2;
    expression len, skb, data;
    type t, t2;
    @@
    (
    -p = skb_put(skb, len);
    +p = skb_put_data(skb, data, len);
    |
    -p = (t)skb_put(skb, len);
    +p = skb_put_data(skb, data, len);
    )
    (
    p2 = (t2)p;
    -memcpy(p2, data, len);
    |
    -memcpy(p, data, len);
    )

    @@
    type t, t2;
    identifier p, p2;
    expression skb, data;
    @@
    t *p;
    ...
    (
    -p = skb_put(skb, sizeof(t));
    +p = skb_put_data(skb, data, sizeof(t));
    |
    -p = (t *)skb_put(skb, sizeof(t));
    +p = skb_put_data(skb, data, sizeof(t));
    )
    (
    p2 = (t2)p;
    -memcpy(p2, data, sizeof(*p));
    |
    -memcpy(p, data, sizeof(*p));
    )

    @@
    expression skb, len, data;
    @@
    -memcpy(skb_put(skb, len), data, len);
    +skb_put_data(skb, data, len);

(again, manually post-processed to retain some comments)

Reviewed-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index 61fff422424f..17b9f1ce23db 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -462,7 +462,7 @@ int nci_nfcc_loopback(struct nci_dev *ndev, void *data, size_t data_len,
 		return -ENOMEM;
 
 	skb_reserve(skb, NCI_DATA_HDR_SIZE);
-	memcpy(skb_put(skb, data_len), data, data_len);
+	skb_put_data(skb, data, data_len);
 
 	loopback_data.conn_id = conn_id;
 	loopback_data.data = skb;
@@ -1350,7 +1350,7 @@ int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload)
 	nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST);
 
 	if (plen)
-		memcpy(skb_put(skb, plen), payload, plen);
+		skb_put_data(skb, payload, plen);
 
 	skb_queue_tail(&ndev->cmd_q, skb);
 	queue_work(ndev->cmd_wq, &ndev->cmd_work);