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tracing: Eliminate double free on failure of allocation on boot up 

If allocation of the max_buffer fails on boot up, the error path will
free both per_cpu data structures from the buffers. With the new redesign
of the code, those structures are freed if allocations failed. That is,
the helper function that allocates the buffers will free the per cpu data
on failure. No need to do it again. In fact, the second free will cause
a bug as the code can not handle a double free.

Link: http://lkml.kernel.org/p/20140603042803.27308.30956.stgit@yunodevel

Signed-off-by: Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Yoshihiro YUNOMAE 2014-06-03 13:28:03 +09:00 committed by Steven Rostedt
parent 964f7b6b78
commit 198376cd88
1 changed files with 0 additions and 4 deletions
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4
kernel/trace/trace.c
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@ -6671,10 +6671,6 @@ __init static int tracer_alloc_buffers(void)
out_free_temp_buffer:
ring_buffer_free(temp_buffer);
out_free_cpumask:
free_percpu(global_trace.trace_buffer.data);
#ifdef CONFIG_TRACER_MAX_TRACE
free_percpu(global_trace.max_buffer.data);
#endif
free_cpumask_var(global_trace.tracing_cpumask);
out_free_buffer_mask:
free_cpumask_var(tracing_buffer_mask);