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Sun, 09 Nov 2025 03:44:40 -0800 (PST) From: Sayooj K Karun To: johannes@sipsolutions.net Cc: linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, sayooj@aerlync.com Subject: [PATCH] mac80211: mesh: tolerate missing mesh RMC cache Date: Sun, 9 Nov 2025 17:13:21 +0530 Message-ID: <20251109114321.10120-1-sayooj@aerlync.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Allow kmem_cache_create() to fail gracefully when the mesh RMC slab cannot be created so multicast forwarding continues even without duplicate filtering. Signed-off-by: Sayooj K Karun --- net/mac80211/mesh.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c index f37068a533f4..20f25226d2f2 100644 --- a/net/mac80211/mesh.c +++ b/net/mac80211/mesh.c @@ -2,10 +2,13 @@ /* * Copyright (c) 2008, 2009 open80211s Ltd. * Copyright (C) 2018 - 2024 Intel Corporation + * Copyright (C) 2025 Aerlync Labs Inc. * Authors: Luis Carlos Cobo * Javier Cardona + * Sayooj K Karun */ =20 +#include #include #include #include @@ -25,9 +28,14 @@ bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt) =20 void ieee80211s_init(void) { - mesh_allocated =3D 1; rm_cache =3D kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry), 0, 0, NULL); + if (!rm_cache) { + pr_warn("mac80211: failed to allocate mesh RMC cache; duplicate filterin= g disabled\n"); + return; + } + + mesh_allocated =3D 1; } =20 void ieee80211s_stop(void) @@ -35,6 +43,8 @@ void ieee80211s_stop(void) if (!mesh_allocated) return; kmem_cache_destroy(rm_cache); + rm_cache =3D NULL; + mesh_allocated =3D 0; } =20 static void ieee80211_mesh_housekeeping_timer(struct timer_list *t) @@ -231,8 +241,8 @@ int mesh_rmc_check(struct ieee80211_sub_if_data *sdata, struct rmc_entry *p; struct hlist_node *n; =20 - if (!rmc) - return -1; + if (!rmc || !rm_cache) + return 0; =20 /* Don't care about endianness since only match matters */ memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum)); --=20 2.43.0