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RxRPC: Don't call skb_add_data() if there's no data to copy

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Don't call skb_add_data() in rxrpc_send_data() if there's no data to copy and
also skip the calculations associated with it in such a case.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2015-04-01 15:48:00 +01:00
parent 3af6878eca
commit aab94830a7
1 changed files with 17 additions and 17 deletions
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34
net/rxrpc/ar-output.c
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@ -549,8 +549,6 @@ static int rxrpc_send_data(struct kiocb *iocb,
if (len > iov_iter_count(&msg->msg_iter))
len = iov_iter_count(&msg->msg_iter);
do {
int copy;
if (!skb) {
size_t size, chunk, max, space;
@ -616,23 +614,25 @@ static int rxrpc_send_data(struct kiocb *iocb,
sp = rxrpc_skb(skb);
/* append next segment of data to the current buffer */
copy = skb_tailroom(skb);
ASSERTCMP(copy, >, 0);
if (copy > len)
copy = len;
if (copy > sp->remain)
copy = sp->remain;
if (len > 0) {
int copy = skb_tailroom(skb);
ASSERTCMP(copy, >, 0);
if (copy > len)
copy = len;
if (copy > sp->remain)
copy = sp->remain;
_debug("add");
ret = skb_add_data(skb, &msg->msg_iter, copy);
_debug("added");
if (ret < 0)
goto efault;
sp->remain -= copy;
skb->mark += copy;
copied += copy;
_debug("add");
ret = skb_add_data(skb, &msg->msg_iter, copy);
_debug("added");
if (ret < 0)
goto efault;
sp->remain -= copy;
skb->mark += copy;
copied += copy;
len -= copy;
len -= copy;
}
/* check for the far side aborting the call or a network error
* occurring */