tracepoints: fix reentrancy
The tracepoints had the same problem markers did have wrt reentrancy. Apply a similar fix using a rcu_barrier after each tracepoint mutex lock. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -356,6 +356,8 @@ int tracepoint_probe_register(const char *name, void *probe)
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mutex_lock(&tracepoints_mutex);
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entry = get_tracepoint(name);
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WARN_ON(!entry);
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if (entry->rcu_pending)
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rcu_barrier_sched();
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tracepoint_entry_free_old(entry, old);
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end:
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mutex_unlock(&tracepoints_mutex);
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@ -392,6 +394,8 @@ int tracepoint_probe_unregister(const char *name, void *probe)
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entry = get_tracepoint(name);
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if (!entry)
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goto end;
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if (entry->rcu_pending)
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rcu_barrier_sched();
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tracepoint_entry_free_old(entry, old);
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remove_tracepoint(name); /* Ignore busy error message */
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ret = 0;
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