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napi_build_skb() reuses NAPI skbuff_head cache in order to save some cycles on freeing/allocating skbuff_heads on every new Rx or completed Tx. Use napi_consume_skb() to feed the cache with skbuff_heads of completed Tx so it's never empty. Signed-off-by: Sieng Piaw Liew <[email protected]> Reviewed-by: Florian Fainelli <[email protected]> Signed-off-by: David S. Miller <[email protected]>