From: Eric Dumazet <eduma...@google.com>
Date: Tue, 26 Mar 2019 08:34:55 -0700
> My recent patch had at least three problems :
>
> 1) TX zerocopy wants notification when skb is acknowledged,
> thus we need to call skb_zcopy_clear() if the skb is
> cached into sk->sk_tx_skb_cache
>
> 2) Some applications might expect precise EPOLLOUT
> notifications, so we need to update sk->sk_wmem_queued
> and call sk_mem_uncharge() from sk_wmem_free_skb()
> in all cases. The SOCK_QUEUE_SHRUNK flag must also be set.
>
> 3) Reuse of saved skb should have used skb_cloned() instead
> of simply checking if the fast clone has been freed.
>
> Fixes: 472c2e07eef0 ("tcp: add one skb cache for tx")
> Signed-off-by: Eric Dumazet <eduma...@google.com>
Applied, thanks Eric.
