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In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 03/02/2025 10:20, Sabrina Dubroca wrote: > 2025-01-13, 10:31:36 +0100, Antonio Quartulli wrote: >> +void ovpn_xmit_special(struct ovpn_peer *peer, const void *data, >> + const unsigned int len) >> +{ >> + struct ovpn_priv *ovpn; >> + struct sk_buff *skb; >> + >> + ovpn = peer->ovpn; >> + if (unlikely(!ovpn)) >> + return; >> + >> + skb = alloc_skb(256 + len, GFP_ATOMIC); >> + if (unlikely(!skb)) >> + return; >> + >> + skb_reserve(skb, 128); >> + skb->priority = TC_PRIO_BESTEFFORT; >> + __skb_put_data(skb, data, len); >> + >> + /* increase reference counter when passing peer to sending queue */ >> + if (!ovpn_peer_hold(peer)) { >> + netdev_dbg(ovpn->dev, >> + "cannot hold peer reference for sending special packet\n"); >> + kfree_skb(skb); >> + return; >> + } >> + >> + ovpn_send(ovpn, skb, peer); >> +} > > [...] >> +static void ovpn_peer_keepalive_send(struct work_struct *work) >> +{ >> + struct ovpn_peer *peer = container_of(work, struct ovpn_peer, >> + keepalive_work); >> + >> + local_bh_disable(); >> + ovpn_xmit_special(peer, ovpn_keepalive_message, >> + sizeof(ovpn_keepalive_message)); >> + local_bh_enable(); >> + ovpn_peer_put(peer); > > nit: could we simply drop this put and the hold in ovpn_xmit_special? > ovpn_peer_keepalive_send has a reference on the peer from the WQ, just > transfer it to ovpn_xmit_special and then ovpn_send. No need to > pretend to acquire one for ovpn_send's sake and drop the one we got > from the WQ? (ovpn_xmit_special would need to _put(peer) in case of > early return) Ok, will drop both and add a comment to remember the casual reader that we already hold a reference (+ put() in error path). Regards, > >> +} > -- Antonio Quartulli OpenVPN Inc.