[PATCH 1/2] taskstats: add_del_listener() shouldn't use the wrongnode

[Oleg Nesterov]

1. 26c4caea "don't allow duplicate entries in listener mode"
   changed add_del_listener(REGISTER) so that "next_cpu:" can
   reuse the listener allocated for the previous cpu, this
   doesn't look exactly right even if minor.

   Change the code to kfree() in the already-registered case,
   this case is unlikely anyway so the extra kmalloc_node()
   shouldn't hurt but looke more correct and clean.

2. use the plain list_for_each_entry() instead of _safe() to
   scan listeners->list.

3. Remove the unneeded INIT_LIST_HEAD(&s->list), we are going
   to list_add(&s->list).

Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
---

 kernel/taskstats.c |   16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

--- ts/kernel/taskstats.c~1_cleanup	2011-07-03 16:27:57.000000000 +0200
+++ ts/kernel/taskstats.c	2011-07-20 19:35:38.000000000 +0200
@@ -291,30 +291,28 @@ static int add_del_listener(pid_t pid, c
 	if (!cpumask_subset(mask, cpu_possible_mask))
 		return -EINVAL;
 
-	s = NULL;
 	if (isadd == REGISTER) {
 		for_each_cpu(cpu, mask) {
-			if (!s)
-				s = kmalloc_node(sizeof(struct listener),
-						 GFP_KERNEL, cpu_to_node(cpu));
+			s = kmalloc_node(sizeof(struct listener),
+					GFP_KERNEL, cpu_to_node(cpu));
 			if (!s)
 				goto cleanup;
+
 			s->pid = pid;
-			INIT_LIST_HEAD(&s->list);
 			s->valid = 1;
 
 			listeners = &per_cpu(listener_array, cpu);
 			down_write(&listeners->sem);
-			list_for_each_entry_safe(s2, tmp, &listeners->list, list) {
+			list_for_each_entry(s2, &listeners->list, list) {
 				if (s2->pid == pid)
-					goto next_cpu;
+					goto exists;
 			}
 			list_add(&s->list, &listeners->list);
 			s = NULL;
-next_cpu:
+exists:
 			up_write(&listeners->sem);
+			kfree(s); /* nop if NULL */
 		}
-		kfree(s);
 		return 0;
 	}
 

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