From: Paolo Abeni <pabeni@redhat.com>
To: Yuyang Huang <yuyanghuang@google.com>
Cc: "David S. Miller" <davem@davemloft.net>,
David Ahern <dsahern@kernel.org>,
Eric Dumazet <edumazet@google.com>,
Ido Schimmel <idosch@nvidia.com>,
Jakub Kicinski <kuba@kernel.org>, Simon Horman <horms@kernel.org>,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [PATCH 1/2] ipv4: igmp: annotate data-races around in_dev->mc_count
Date: Thu, 4 Jun 2026 11:11:30 +0200 [thread overview]
Message-ID: <95adff35-ee56-49d3-8567-382ac17810b3@redhat.com> (raw)
In-Reply-To: <20260531030705.3754389-2-yuyanghuang@google.com>
On 5/31/26 5:07 AM, Yuyang Huang wrote:
> @@ -1922,7 +1923,7 @@ void ip_mc_destroy_dev(struct in_device *in_dev)
>
> while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
> in_dev->mc_list = i->next_rcu;
> - in_dev->mc_count--;
> + WRITE_ONCE(in_dev->mc_count, in_dev->mc_count - 1);
> ip_mc_clear_src(i);
> ip_ma_put(i);
The patch LGTM, but note that sashiko has identified a pre-existing
issue which could deserve a follow-up:
https://sashiko.dev/#/patchset/20260531030705.3754389-1-yuyanghuang%40google.com
/P
> }
> @@ -2974,7 +2975,9 @@ static int igmp_mc_seq_show(struct seq_file *seq, void *v)
>
> if (rcu_access_pointer(state->in_dev->mc_list) == im) {
> seq_printf(seq, "%d\t%-10s: %5d %7s\n",
> - state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
> + state->dev->ifindex, state->dev->name,
> + READ_ONCE(state->in_dev->mc_count),
> + querier);
> }
>
> delta = im->timer.expires - jiffies;
next prev parent reply other threads:[~2026-06-04 9:11 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-31 3:07 [PATCH net-next 0/2] ipv4: igmp: annotate diagnostic procfs data races Yuyang Huang
2026-05-31 3:07 ` [PATCH 1/2] ipv4: igmp: annotate data-races around in_dev->mc_count Yuyang Huang
2026-06-04 9:11 ` Paolo Abeni [this message]
2026-06-04 9:15 ` Paolo Abeni
2026-06-04 10:17 ` Ido Schimmel
2026-06-04 10:19 ` Ido Schimmel
2026-06-04 11:41 ` Yuyang Huang
2026-05-31 3:07 ` [PATCH 2/2] ipv4: igmp: annotate data-races around timer-related fields Yuyang Huang
2026-06-04 10:20 ` Ido Schimmel
2026-06-04 11:35 ` Yuyang Huang
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