netdev - [PATCH net 5/5] net: dst_cache: add two DEBUG

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Message-ID: <20240531132636.2637995-6-edumazet@google.com>
Date: Fri, 31 May 2024 13:26:36 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net 5/5] net: dst_cache: add two DEBUG_NET warnings

After fixing four different bugs involving dst_cache
users, it might be worth adding a check about BH being
blocked by dst_cache callers.

DEBUG_NET_WARN_ON_ONCE(!in_softirq());

It is not fatal, if we missed valid case where no
BH deadlock is to be feared, we might change this.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/core/dst_cache.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/core/dst_cache.c b/net/core/dst_cache.c
index 6a0482e676d379f1f9bffdda51c7535243b3ec38..70c634b9e7b02300188582a1634d5977838db132 100644
--- a/net/core/dst_cache.c
+++ b/net/core/dst_cache.c
@@ -27,6 +27,7 @@ struct dst_cache_pcpu {
 static void dst_cache_per_cpu_dst_set(struct dst_cache_pcpu *dst_cache,
 				      struct dst_entry *dst, u32 cookie)
 {
+	DEBUG_NET_WARN_ON_ONCE(!in_softirq());
 	dst_release(dst_cache->dst);
 	if (dst)
 		dst_hold(dst);
@@ -40,6 +41,7 @@ static struct dst_entry *dst_cache_per_cpu_get(struct dst_cache *dst_cache,
 {
 	struct dst_entry *dst;
 
+	DEBUG_NET_WARN_ON_ONCE(!in_softirq());
 	dst = idst->dst;
 	if (!dst)
 		goto fail;
-- 
2.45.1.288.g0e0cd299f1-goog