[RFC][PATCH 07/11] perf_counter: fix up counter free paths

[Peter Zijlstra]

I found another counter free path, create a free_counter() call to accomodate
generic tear-down.

Fixes an RCU bug.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
---
 kernel/perf_counter.c |   11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

Index: linux-2.6/kernel/perf_counter.c
===================================================================
--- linux-2.6.orig/kernel/perf_counter.c
+++ linux-2.6/kernel/perf_counter.c
@@ -1150,6 +1150,11 @@ static void free_counter_rcu(struct rcu_
 	kfree(counter);
 }
 
+static void free_counter(struct perf_counter *counter)
+{
+	call_rcu(&counter->rcu_head, free_counter_rcu);
+}
+
 /*
  * Called when the last reference to the file is gone.
  */
@@ -1168,7 +1173,7 @@ static int perf_release(struct inode *in
 	mutex_unlock(&counter->mutex);
 	mutex_unlock(&ctx->mutex);
 
-	call_rcu(&counter->rcu_head, free_counter_rcu);
+	free_counter(counter);
 	put_context(ctx);
 
 	return 0;
@@ -2128,10 +2133,10 @@ __perf_counter_exit_task(struct task_str
 					 list_entry) {
 			if (sub->parent) {
 				sync_child_counter(sub, sub->parent);
-				kfree(sub);
+				free_counter(sub);
 			}
 		}
-		kfree(child_counter);
+		free_counter(child_counter);
 	}
 }
 

-- 

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