netdev - [PATCH net v2 1/2] openvswitch: drop unneeded BUG_ON() in ovs_flow_cmd_build

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Message-Id: <ec6d2374cbeb4f59001399a3925b669ba9538ac9.1575221237.git.pabeni@redhat.com>
Date:   Sun,  1 Dec 2019 18:41:24 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Pravin B Shelar <pshelar@....org>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Subject: [PATCH net v2 1/2] openvswitch: drop unneeded BUG_ON() in ovs_flow_cmd_build_info()

All the callers of ovs_flow_cmd_build_info() already deal with
error return code correctly, so we can handle the error condition
in a more gracefull way. Still dump a warning to preserve
debuggability.

v1 -> v2:
 - clarify the commit message
 - clean the skb and report the error (DaveM)

Fixes: ccb1352e76cf ("net: Add Open vSwitch kernel components.")
Signed-off-by: Paolo Abeni <pabeni@...hat.com>
---
 net/openvswitch/datapath.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index 293d5289c4a1..8cab3435d8da 100644
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -905,7 +905,10 @@ static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
 	retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
 					info->snd_portid, info->snd_seq, 0,
 					cmd, ufid_flags);
-	BUG_ON(retval < 0);
+	if (WARN_ON_ONCE(retval < 0)) {
+		kfree_skb(skb);
+		skb = ERR_PTR(retval);
+	}
 	return skb;
 }
 
-- 
2.21.0