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ring-buffer: Do not poll non allocated cpu buffers
[GitHub/mt8127/android_kernel_alcatel_ttab.git]
/
kernel
/
trace
/
ring_buffer.c
diff --git
a/kernel/trace/ring_buffer.c
b/kernel/trace/ring_buffer.c
index b59aea2c48c287f5de894efcba7d53c02fd6f279..e444ff88f0a425a00a4921291b46678b6a7efe21 100644
(file)
--- a/
kernel/trace/ring_buffer.c
+++ b/
kernel/trace/ring_buffer.c
@@
-620,6
+620,9
@@
int ring_buffer_poll_wait(struct ring_buffer *buffer, int cpu,
if (cpu == RING_BUFFER_ALL_CPUS)
work = &buffer->irq_work;
else {
+ if (!cpumask_test_cpu(cpu, buffer->cpumask))
+ return -EINVAL;
+
cpu_buffer = buffer->buffers[cpu];
work = &cpu_buffer->irq_work;
}