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drop_monitor: Add error code to detect duplicate state changes
Patch to add -EAGAIN error to dropwatch netlink message handling code. -EAGAIN will be returned anytime userspace attempts to transition the state of the drop monitor service to a state that its already in. That allows user space to detect this condition, so it doesn't wait for a success ACK that will never arrive. Tested successfully by me Signed-off-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -223,6 +223,11 @@ static int set_all_monitor_traces(int state)
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spin_lock(&trace_state_lock);
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if (state == trace_state) {
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rc = -EAGAIN;
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goto out_unlock;
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}
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switch (state) {
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case TRACE_ON:
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rc |= register_trace_kfree_skb(trace_kfree_skb_hit, NULL);
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@ -251,11 +256,12 @@ static int set_all_monitor_traces(int state)
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if (!rc)
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trace_state = state;
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else
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rc = -EINPROGRESS;
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out_unlock:
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spin_unlock(&trace_state_lock);
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if (rc)
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return -EINPROGRESS;
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return rc;
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}
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