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

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Date:	Mon, 7 May 2007 10:35:45 +1000
From:	NeilBrown <neilb@...e.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Neil Brown <neilb@...e.de>
Subject: [PATCH 005 of 8] knfsd: Simplify a 'while' condition in svcsock.c


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@...e.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) {
-
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