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perfcounters: fix refcounting bug, take 2

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Only free child_counter if it has a parent; if it doesn't, then it
has a file pointing to it and we'll free it in perf_release.

Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Paul Mackerras 2009-02-11 13:53:19 +01:00 committed by Ingo Molnar
parent 5af759176c
commit 4bcf349a0f
1 changed files with 4 additions and 5 deletions
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5
kernel/perf_counter.c
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@ -1958,15 +1958,14 @@ __perf_counter_exit_task(struct task_struct *child,
sync_child_counter(child_counter, parent_counter);
list_for_each_entry_safe(sub, tmp, &child_counter->sibling_list,
list_entry) {
if (sub->parent)
if (sub->parent) {
sync_child_counter(sub, sub->parent);
kfree(sub);
}
}
if (!child_counter->filp || !atomic_long_read(&child_counter->filp->f_count))
kfree(child_counter);
}
}
/*
* When a child task exits, feed back counter values to parent counters.