inetpeer: remove create argument of inet_getpeer()

BugLink: https://bugs.launchpad.net/bugs/2111953

[ Upstream commit 7a596a5 ]

All callers of inet_getpeer() want to create an inetpeer.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20241215175629.1248773-3-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: a853c60 ("inetpeer: do not get a refcount in inet_getpeer()")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Mehmet Basaran <mehmet.basaran@canonical.com>

Author: edumazet

include/net/inetpeer.h

@@ -96,8 +96,7 @@ static inline struct in6_addr *inetpeer_get_addr_v6(struct inetpeer_addr *iaddr)
 
 /* can be called with or without local BH being disabled */
 struct inet_peer *inet_getpeer(struct inet_peer_base *base,
-			       const struct inetpeer_addr *daddr,
-			       int create);
+			       const struct inetpeer_addr *daddr);
 
 static inline struct inet_peer *inet_getpeer_v4(struct inet_peer_base *base,
 						__be32 v4daddr,
@@ -108,7 +107,7 @@ static inline struct inet_peer *inet_getpeer_v4(struct inet_peer_base *base,
 	daddr.a4.addr = v4daddr;
 	daddr.a4.vif = vif;
 	daddr.family = AF_INET;
-	return inet_getpeer(base, &daddr, 1);
+	return inet_getpeer(base, &daddr);
 }
 
 static inline struct inet_peer *inet_getpeer_v6(struct inet_peer_base *base,
@@ -118,7 +117,7 @@ static inline struct inet_peer *inet_getpeer_v6(struct inet_peer_base *base,
 
 	daddr.a6 = *v6daddr;
 	daddr.family = AF_INET6;
-	return inet_getpeer(base, &daddr, 1);
+	return inet_getpeer(base, &daddr);
 }
 
 static inline int inetpeer_addr_cmp(const struct inetpeer_addr *a,

net/ipv4/inetpeer.c

@@ -177,30 +177,23 @@ static void inet_peer_gc(struct inet_peer_base *base,
 }
 
 struct inet_peer *inet_getpeer(struct inet_peer_base *base,
-			       const struct inetpeer_addr *daddr,
-			       int create)
+			       const struct inetpeer_addr *daddr)
 {
 	struct inet_peer *p, *gc_stack[PEER_MAX_GC];
 	struct rb_node **pp, *parent;
 	unsigned int gc_cnt, seq;
-	int invalidated;
 
 	/* Attempt a lockless lookup first.
 	 * Because of a concurrent writer, we might not find an existing entry.
 	 */
 	rcu_read_lock();
 	seq = read_seqbegin(&base->lock);
 	p = lookup(daddr, base, seq, NULL, &gc_cnt, &parent, &pp);
-	invalidated = read_seqretry(&base->lock, seq);
 	rcu_read_unlock();
 
 	if (p)
 		return p;
 
-	/* If no writer did a change during our lookup, we can return early. */
-	if (!create && !invalidated)
-		return NULL;
-
 	/* retry an exact lookup, taking the lock before.
 	 * At least, nodes should be hot in our cache.
 	 */
@@ -209,7 +202,7 @@ struct inet_peer *inet_getpeer(struct inet_peer_base *base,
 
 	gc_cnt = 0;
 	p = lookup(daddr, base, seq, gc_stack, &gc_cnt, &parent, &pp);
-	if (!p && create) {
+	if (!p) {
 		p = kmem_cache_alloc(peer_cachep, GFP_ATOMIC);
 		if (p) {
 			p->daddr = *daddr;