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Gleb Smirnoff authored
The previous commit to this node falsely stated that locked callouts are compatible with netgraph ng_callout KPI. They are not. An item can be queued instead of being applied to the node, which results in a mutex leak to the callout thread and later unlocked call into function that expects to be called locked. Potentially netgraph can be taught to handle locked callouts, but that would bring a lot of complexity in it. Instead lets question necessity of ng_callout() instead of callout_reset(). It protects against node going away while callout is scheduled. But a node that drains all callouts in the shutdown method (ng_l2tp does) is already protected. Fixes: 89042ff7
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