this patch simplifies audit_free()'s locking: no need to lock a task
that we are tearing down. [the extra locking also caused false positives
in the lock validator]
Signed-off-by: Ingo Molnar <[email protected]>
Index: linux/kernel/auditsc.c
===================================================================
--- linux.orig/kernel/auditsc.c
+++ linux/kernel/auditsc.c
@@ -692,10 +692,14 @@ void audit_free(struct task_struct *tsk)
{
struct audit_context *context;
- task_lock(tsk);
+ /*
+ * No need to lock the task - when we execute audit_free()
+ * then the task has no external references anymore, and
+ * we are tearing it down. (The locking also confuses
+ * DEBUG_LOCKDEP - this freeing may occur in softirq
+ * contexts as well, via RCU.)
+ */
context = audit_get_context(tsk, 0, 0);
- task_unlock(tsk);
-
if (likely(!context))
return;
-
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