On Tuesday, 1 April 2025 10:39:00 CEST Wentao Liang wrote:

In batadv_tvlv_unicast_send(), the return value of batadv_send_skb_to_orig() is ignored. This could silently drop send failures, making it difficult to detect connectivity issues.

Add error checking for batadv_send_skb_to_orig() and log failures via batadv_dbg() to improve error visibility.

This looks more like patch you've added for printk-debugging and nothing for stable. And you ignore that it can also return things like -EINPROGRESS. Which is not an error.

You can also see that this was just for printk-debugging because the error class and message has nothing to do with the actual code.

Fixes: 1ad5bcb2a032 ("batman-adv: Consume skb in batadv_send_skb_to_orig") Cc: stable@vger.kernel.org # 4.10+ Signed-off-by: Wentao Liang vulab@iscas.ac.cn

---

net/batman-adv/tvlv.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/net/batman-adv/tvlv.c b/net/batman-adv/tvlv.c index 2a583215d439..f081136cc5b7 100644 --- a/net/batman-adv/tvlv.c +++ b/net/batman-adv/tvlv.c @@ -625,6 +625,7 @@ void batadv_tvlv_unicast_send(struct batadv_priv

*bat_priv, const u8 *src,

unsigned char *tvlv_buff; unsigned int tvlv_len; ssize_t hdr_len = sizeof(*unicast_tvlv_packet);

• int r;

orig_node = batadv_orig_hash_find(bat_priv, dst); if (!orig_node) @@ -657,7 +658,10 @@ void batadv_tvlv_unicast_send(struct batadv_priv

*bat_priv, const u8 *src,

tvlv_buff += sizeof(*tvlv_hdr); memcpy(tvlv_buff, tvlv_value, tvlv_value_len);

• batadv_send_skb_to_orig(skb, orig_node, NULL);

• r = batadv_send_skb_to_orig(skb, orig_node, NULL);
• if (r != NET_XMIT_SUCCESS)

• batadv_dbg(BATADV_DBG_TP_METER, bat_priv,
  

• 	   "Fail to send the ack.");
  

No, this is definitely the wrong error class. And why do you think that it is an ack?

out: batadv_orig_node_put(orig_node); }

Kind regards, Sven