netdev - [PATCH v2 net-next 10/15] ipv6: mcast: Remove unnecessary ASSERT

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Message-ID: <20250624202616.526600-11-kuni1840@gmail.com>
Date: Tue, 24 Jun 2025 13:24:16 -0700
From: Kuniyuki Iwashima <kuni1840@...il.com>
To: "David S. Miller" <davem@...emloft.net>,
	David Ahern <dsahern@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Cc: Simon Horman <horms@...nel.org>,
	Kuniyuki Iwashima <kuniyu@...gle.com>,
	Kuniyuki Iwashima <kuni1840@...il.com>,
	netdev@...r.kernel.org
Subject: [PATCH v2 net-next 10/15] ipv6: mcast: Remove unnecessary ASSERT_RTNL and comment.

From: Kuniyuki Iwashima <kuniyu@...gle.com>

Now, RTNL is not needed for mcast code, and what's commented in
ip6_mc_msfget() is apparent by for_each_pmc_socklock(), which has
lockdep annotation for lock_sock().

Let's remove the comment and ASSERT_RTNL() in ipv6_mc_rejoin_groups().

Signed-off-by: Kuniyuki Iwashima <kuniyu@...gle.com>
---
 net/ipv6/mcast.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index af322a455346..dc363a6c0b7a 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -605,10 +605,6 @@ int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 	if (!ipv6_addr_is_multicast(group))
 		return -EINVAL;
 
-	/* changes to the ipv6_mc_list require the socket lock and
-	 * rtnl lock. We have the socket lock, so reading the list is safe.
-	 */
-
 	for_each_pmc_socklock(inet6, sk, pmc) {
 		if (pmc->ifindex != gsf->gf_interface)
 			continue;
@@ -2880,8 +2876,6 @@ static void ipv6_mc_rejoin_groups(struct inet6_dev *idev)
 {
 	struct ifmcaddr6 *pmc;
 
-	ASSERT_RTNL();
-
 	mutex_lock(&idev->mc_lock);
 	if (mld_in_v1_mode(idev)) {
 		for_each_mc_mclock(idev, pmc)
-- 
2.49.0