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networking: introduce and use skb_put_data()

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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>
This commit is contained in:
Johannes Berg
2017-06-16 14:29:20 +02:00
committed by David S. Miller
parent b080db5853
commit 59ae1d127a
252 changed files with 622 additions and 741 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/s390/net/ctcm_main.c
View File

@@ -522,7 +522,7 @@ static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb)
ctcm_clear_busy(ch->netdev);
return -ENOMEM;
} else {
memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
skb_put_data(nskb, skb->data, skb->len);
atomic_inc(&nskb->users);
atomic_dec(&skb->users);
dev_kfree_skb_irq(skb);
@@ -638,7 +638,7 @@ static void ctcmpc_send_sweep_req(struct channel *rch)
header->th.th_seq_num = 0x00;
header->sw.th_last_seq = ch->th_seq_num;
memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH);
skb_put_data(sweep_skb, header, TH_SWEEP_LENGTH);
kfree(header);
@@ -728,7 +728,7 @@ static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
if (!nskb) {
goto nomem_exit;
} else {
memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
skb_put_data(nskb, skb->data, skb->len);
atomic_inc(&nskb->users);
atomic_dec(&skb->users);
dev_kfree_skb_irq(skb);
@@ -809,7 +809,7 @@ static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
skb_reset_tail_pointer(ch->trans_skb);
ch->trans_skb->len = 0;
ch->ccw[1].count = skb->len;
memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len);
skb_put_data(ch->trans_skb, skb->data, skb->len);
atomic_dec(&skb->users);
dev_kfree_skb_irq(skb);
ccw_idx = 0;
@@ -960,7 +960,7 @@ static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
}
newskb->protocol = skb->protocol;
skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
memcpy(skb_put(newskb, skb->len), skb->data, skb->len);
skb_put_data(newskb, skb->data, skb->len);
dev_kfree_skb_any(skb);
skb = newskb;
}