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ftrace: avoid double-free of dyn_ftrace

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If dyn_ftrace is freed before ftrace_release(), ftrace_release()
will free it again and make ftrace_free_records wrong.

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Cc: "Steven Rostedt ;" <rostedt@goodmis.org>
LKML-Reference: <49BA23D9.1050900@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Zhaolei 2009-03-13 17:14:01 +08:00 committed by Ingo Molnar
parent 62a394eb77
commit b00f0b6dc1
1 changed files with 2 additions and 1 deletions
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3
kernel/trace/ftrace.c
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@ -356,7 +356,8 @@ void ftrace_release(void *start, unsigned long size)
mutex_lock(&ftrace_lock);
do_for_each_ftrace_rec(pg, rec) {
if ((rec->ip >= s) && (rec->ip < e))
if ((rec->ip >= s) && (rec->ip < e) &&
!(rec->flags & FTRACE_FL_FREE))
ftrace_free_rec(rec);
} while_for_each_ftrace_rec();
mutex_unlock(&ftrace_lock);