perf: Clean up 'ctx' reference counting
Small cleanup to how we refcount in find_get_context(), this also
allows us to use put_ctx() to free things instead of using kfree().
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20110409192141.719340481@chello.nl
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 4d9a1f01..d665ac4 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -2835,16 +2835,12 @@
unclone_ctx(ctx);
++ctx->pin_count;
raw_spin_unlock_irqrestore(&ctx->lock, flags);
- }
-
- if (!ctx) {
+ } else {
ctx = alloc_perf_context(pmu, task);
err = -ENOMEM;
if (!ctx)
goto errout;
- get_ctx(ctx);
-
err = 0;
mutex_lock(&task->perf_event_mutex);
/*
@@ -2856,14 +2852,14 @@
else if (task->perf_event_ctxp[ctxn])
err = -EAGAIN;
else {
+ get_ctx(ctx);
++ctx->pin_count;
rcu_assign_pointer(task->perf_event_ctxp[ctxn], ctx);
}
mutex_unlock(&task->perf_event_mutex);
if (unlikely(err)) {
- put_task_struct(task);
- kfree(ctx);
+ put_ctx(ctx);
if (err == -EAGAIN)
goto retry;