ring-buffer: disable writers when resetting buffers
As a precaution, it is best to disable writing to the ring buffers when reseting them. [ Impact: prevent weird things if write happens during reset ] Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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@ -2650,6 +2650,8 @@ void ring_buffer_reset_cpu(struct ring_buffer *buffer, int cpu)
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if (!cpumask_test_cpu(cpu, buffer->cpumask))
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if (!cpumask_test_cpu(cpu, buffer->cpumask))
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return;
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return;
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atomic_inc(&cpu_buffer->record_disabled);
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spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
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spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
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__raw_spin_lock(&cpu_buffer->lock);
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__raw_spin_lock(&cpu_buffer->lock);
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@ -2659,6 +2661,8 @@ void ring_buffer_reset_cpu(struct ring_buffer *buffer, int cpu)
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__raw_spin_unlock(&cpu_buffer->lock);
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__raw_spin_unlock(&cpu_buffer->lock);
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spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
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spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
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atomic_dec(&cpu_buffer->record_disabled);
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}
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}
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EXPORT_SYMBOL_GPL(ring_buffer_reset_cpu);
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EXPORT_SYMBOL_GPL(ring_buffer_reset_cpu);
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