[PATCH 005 of 8] knfsd: Simplify a 'while' condition in svcsock.c

NeilBrown
2007-05-07T00:36:32Z

This while loop has an overly complex condition, which performs a
couple of assignments. This hurts readability.

We don't really need a loop at all. We can just return -EAGAIN and
(providing we set SK_DATA), the function will be called again.

So discard the loop, make the complex conditional become a few clear
function calls, and hopefully improve readability.

Signed-off-by: Neil Brown <neilb@suse.de>

### Diffstat output
./net/sunrpc/svcsock.c | 21 +++++++++++++--------
1 file changed, 13 insertions(+), 8 deletions(-)

diff .prev/net/sunrpc/svcsock.c ./net/sunrpc/svcsock.c
--- .prev/net/sunrpc/svcsock.c 2007-05-07 10:30:16.000000000 +1000
+++ ./net/sunrpc/svcsock.c 2007-05-07 10:31:04.000000000 +1000
@@ -788,15 +788,20 @@ svc_udp_recvfrom(struct svc_rqst *rqstp)
}

clear_bit(SK_DATA, &svsk->sk_flags);
- while ((err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
- 0, 0, MSG_PEEK | MSG_DONTWAIT)) < 0 ||
- (skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err)) == NULL) {
- if (err == -EAGAIN) {
- svc_sock_received(svsk);
- return err;
+ skb = NULL;
+ err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
+ 0, 0, MSG_PEEK | MSG_DONTWAIT);
+ if (err >= 0)
+ skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err);
+
+ if (skb == NULL) {
+ if (err != -EAGAIN) {
+ /* possibly an icmp error */
+ dprintk("svc: recvfrom returned error %d\n", -err);
+ set_bit(SK_DATA, &svsk->sk_flags);
}
- /* possibly an icmp error */
- dprintk("svc: recvfrom returned error %d\n", -err);
+ svc_sock_received(svsk);
+ return -EAGAIN;
}
rqstp->rq_addrlen = sizeof(rqstp->rq_addr);
if (skb->tstamp.tv64 == 0) {