lisa/android_kernel_xiaomi_sm8350
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Merge "trace: Fix race in trace_open and buffer resize call"

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qctecmdr 2020-09-21 23:57:21 -07:00 committed by Gerrit - the friendly Code Review server
commit 0e13e74f0c
1 changed files with 4 additions and 0 deletions
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4
kernel/trace/ring_buffer.c
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@ -4405,6 +4405,8 @@ void ring_buffer_reset_cpu(struct ring_buffer *buffer, int cpu)
if (!cpumask_test_cpu(cpu, buffer->cpumask))
return;
/* prevent another thread from changing buffer sizes */
mutex_lock(&buffer->mutex);
atomic_inc(&buffer->resize_disabled);
atomic_inc(&cpu_buffer->record_disabled);
@ -4428,6 +4430,8 @@ void ring_buffer_reset_cpu(struct ring_buffer *buffer, int cpu)
atomic_dec(&cpu_buffer->record_disabled);
atomic_dec(&buffer->resize_disabled);
mutex_unlock(&buffer->mutex);
}
EXPORT_SYMBOL_GPL(ring_buffer_reset_cpu);