From: Amol Grover <frextrite@gmail.com>
Date: Fri, 21 Feb 2020 15:15:38 +0000 (+0530)
Subject: tcp, ulp: Pass lockdep expression to RCU lists
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=958a93c15466c69e2ec531332e67011f549943bd;p=linux.git

tcp, ulp: Pass lockdep expression to RCU lists

tcp_ulp_list is traversed using list_for_each_entry_rcu
outside an RCU read-side critical section but under the protection
of tcp_ulp_list_lock.

Hence, add corresponding lockdep expression to silence false-positive
warnings, and harden RCU lists.t

Signed-off-by: Amol Grover <frextrite@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv4/tcp_ulp.c b/net/ipv4/tcp_ulp.c
index 6c43fa189195d..2703f24c5d1a8 100644
--- a/net/ipv4/tcp_ulp.c
+++ b/net/ipv4/tcp_ulp.c
@@ -22,7 +22,8 @@ static struct tcp_ulp_ops *tcp_ulp_find(const char *name)
 {
 	struct tcp_ulp_ops *e;
 
-	list_for_each_entry_rcu(e, &tcp_ulp_list, list) {
+	list_for_each_entry_rcu(e, &tcp_ulp_list, list,
+				lockdep_is_held(&tcp_ulp_list_lock)) {
 		if (strcmp(e->name, name) == 0)
 			return e;
 	}