SUNRPC: change svc_recv() to return void.

svc_recv() currently returns a 0 on success or one of two errors:
 - -EAGAIN means no message was successfully received
 - -EINTR means the thread has been told to stop

Previously nfsd would stop as the result of a signal as well as
following kthread_stop().  In that case the difference was useful: EINTR
means stop unconditionally.  EAGAIN means stop if kthread_should_stop(),
continue otherwise.

Now threads only exit when kthread_should_stop() so we don't need the
distinction.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

3 files changed, 5 insertions, 28 deletions

diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
index 91ef139a7757..cf4ff7d3564c 100644
--- a/fs/lockd/svc.c
+++ b/fs/lockd/svc.c
@@ -116,7 +116,6 @@ static void set_grace_period(struct net *net)
 static int
 lockd(void *vrqstp)
 {
-	int		err = 0;
 	struct svc_rqst *rqstp = vrqstp;
 	struct net *net = &init_net;
 	struct lockd_net *ln = net_generic(net, lockd_net_id);
@@ -138,13 +137,7 @@ lockd(void *vrqstp)
 
 		timeout = nlmsvc_retry_blocked();
 
-		/*
-		 * Find a socket with data available and call its
-		 * recvfrom routine.
-		 */
-		err = svc_recv(rqstp, timeout);
-		if (err == -EAGAIN || err == -EINTR)
-			continue;
+		svc_recv(rqstp, timeout);
 	}
 	if (nlmsvc_ops)
 		nlmsvc_invalidate_all();
diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c
index 2d94384bd6a9..54155b484f7b 100644
--- a/fs/nfs/callback.c
+++ b/fs/nfs/callback.c
@@ -74,19 +74,12 @@ out_err:
 static int
 nfs4_callback_svc(void *vrqstp)
 {
-	int err;
 	struct svc_rqst *rqstp = vrqstp;
 
 	set_freezable();
 
-	while (!kthread_freezable_should_stop(NULL)) {
-		/*
-		 * Listen for a request on the socket
-		 */
-		err = svc_recv(rqstp, MAX_SCHEDULE_TIMEOUT);
-		if (err == -EAGAIN || err == -EINTR)
-			continue;
-	}
+	while (!kthread_freezable_should_stop(NULL))
+		svc_recv(rqstp, MAX_SCHEDULE_TIMEOUT);
 
 	svc_exit_thread(rqstp);
 	return 0;
diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index 547feb8ad0af..4c0ab101d90b 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -939,7 +939,6 @@ nfsd(void *vrqstp)
 	struct svc_xprt *perm_sock = list_entry(rqstp->rq_server->sv_permsocks.next, typeof(struct svc_xprt), xpt_list);
 	struct net *net = perm_sock->xpt_net;
 	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
-	int err;
 
 	/* At this point, the thread shares current->fs
 	 * with the init process. We need to create files with the
@@ -958,19 +957,11 @@ nfsd(void *vrqstp)
 	/*
 	 * The main request loop
 	 */
-	for (;;) {
+	while (!kthread_should_stop()) {
 		/* Update sv_maxconn if it has changed */
 		rqstp->rq_server->sv_maxconn = nn->max_connections;
 
-		/*
-		 * Find a socket with data available and call its
-		 * recvfrom routine.
-		 */
-		while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN)
-			;
-		if (err == -EINTR)
-			break;
-
+		svc_recv(rqstp, 60*60*HZ);
 		validate_process_creds();
 	}