linux-kernel - [Patch 2/3] taskstats: free skb, avoid returns in send_cpu

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Message-Id: <1153173255.4551.16.camel@dyn9002218086.watson.ibm.com>
Date:	Mon, 17 Jul 2006 17:54:15 -0400
From:	Shailabh Nagar <nagar@...son.ibm.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Balbir Singh <balbir@...ibm.com>,
	Chris Sturtivant <csturtiv@....com>
Subject: [Patch 2/3] taskstats: free skb, avoid returns in
	send_cpu_listeners

Add a missing freeing of skb in the case there are no listeners at all.
Also remove the returning of error values by the function as it is unused by
the sole caller.

Signed-Off-By: Shailabh Nagar <nagar@...son.ibm.com>
Signed-Off-By: Chandra Seetharaman <sekharan@...ibm.com>

 kernel/taskstats.c |   24 +++++++++++-------------
 1 files changed, 11 insertions(+), 13 deletions(-)

Index: linux-2.6.18-rc2/kernel/taskstats.c
===================================================================
--- linux-2.6.18-rc2.orig/kernel/taskstats.c	2006-07-17 17:03:41.000000000 -0400
+++ linux-2.6.18-rc2/kernel/taskstats.c	2006-07-17 17:06:52.000000000 -0400
@@ -121,46 +121,45 @@ static int send_reply(struct sk_buff *sk
 /*
  * Send taskstats data in @skb to listeners registered for @cpu's exit data
  */
-static int send_cpu_listeners(struct sk_buff *skb, unsigned int cpu)
+static void send_cpu_listeners(struct sk_buff *skb, unsigned int cpu)
 {
 	struct genlmsghdr *genlhdr = nlmsg_data((struct nlmsghdr *)skb->data);
 	struct listener_list *listeners;
 	struct listener *s, *tmp;
 	struct sk_buff *skb_next, *skb_cur = skb;
 	void *reply = genlmsg_data(genlhdr);
-	int rc, ret, delcount = 0;
+	int rc, delcount = 0;
 
 	rc = genlmsg_end(skb, reply);
 	if (rc < 0) {
 		nlmsg_free(skb);
-		return rc;
+		return;
 	}
 
 	rc = 0;
 	listeners = &per_cpu(listener_array, cpu);
 	down_read(&listeners->sem);
-	list_for_each_entry_safe(s, tmp, &listeners->list, list) {
+	list_for_each_entry(s, &listeners->list, list) {
 		skb_next = NULL;
 		if (!list_is_last(&s->list, &listeners->list)) {
 			skb_next = skb_clone(skb_cur, GFP_KERNEL);
-			if (!skb_next) {
-				nlmsg_free(skb_cur);
-				rc = -ENOMEM;
+			if (!skb_next)
 				break;
-			}
 		}
-		ret = genlmsg_unicast(skb_cur, s->pid);
-		if (ret == -ECONNREFUSED) {
+		rc = genlmsg_unicast(skb_cur, s->pid);
+		if (rc == -ECONNREFUSED) {
 			s->valid = 0;
 			delcount++;
-			rc = ret;
 		}
 		skb_cur = skb_next;
 	}
 	up_read(&listeners->sem);
 
+	if (skb_cur)
+		nlmsg_free(skb_cur);
+
 	if (!delcount)
-		return rc;
+		return;
 
 	/* Delete invalidated entries */
 	down_write(&listeners->sem);
@@ -171,7 +170,6 @@ static int send_cpu_listeners(struct sk_
 		}
 	}
 	up_write(&listeners->sem);
-	return rc;
 }
 
 static int fill_pid(pid_t pid, struct task_struct *pidtsk,


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