From: Sean Wang <sean.wang@kernel.org>
To: Felix Fietkau <nbd@nbd.name>, Lorenzo Bianconi <lorenzo@kernel.org>
Cc: linux-wireless@vger.kernel.org,
linux-mediatek@lists.infradead.org,
Sean Wang <sean.wang@mediatek.com>
Subject: [PATCH] wifi: mt76: mt7925: fix crash in reset link replay
Date: Tue, 16 Jun 2026 11:10:16 -0500 [thread overview]
Message-ID: <20260616161016.19346-1-sean.wang@kernel.org> (raw)
From: Sean Wang <sean.wang@mediatek.com>
During reset recovery, mt7925_vif_connect_iter() replays firmware state
for links tracked in mvif->valid_links. After MLO link changes or MCU
timeout recovery, the driver bitmap can temporarily contain a link whose
mac80211 bss_conf has already gone away.
This can pass a NULL bss_conf to mt76_connac_mcu_uni_add_dev(), matching
the crash where x1, the second argument, is NULL:
pc : mt76_connac_mcu_uni_add_dev+0x8c/0x1f8 [mt76_connac_lib]
lr : mt7925_vif_connect_iter+0x9c/0x168 [mt7925_common]
x2 : ffffff80a77f6018 x1 : 0000000000000000 x0 : ffffff8099402080
Call trace:
mt76_connac_mcu_uni_add_dev+0x8c/0x1f8 [mt76_connac_lib]
mt7925_vif_connect_iter+0x9c/0x168 [mt7925_common]
mt7925_mac_reset_work+0x264/0x2f8 [mt7925_common]
Skip missing bss_conf entries before replaying the link. Non-MLO AP/STA
reset replay is unchanged because the helper still returns &vif->bss_conf
for the legacy link.
Fixes: 14061994184d ("wifi: mt76: mt7925: add link handling in mt7925_vif_connect_iter")
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
---
drivers/net/wireless/mediatek/mt76/mt7925/mac.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/mac.c b/drivers/net/wireless/mediatek/mt76/mt7925/mac.c
index d7e4ebe92342..cee4e4b8ff41 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7925/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7925/mac.c
@@ -1284,6 +1284,9 @@ mt7925_vif_connect_iter(void *priv, u8 *mac,
for_each_set_bit(i, &valid, IEEE80211_MLD_MAX_NUM_LINKS) {
bss_conf = mt792x_vif_to_bss_conf(vif, i);
+ if (!bss_conf)
+ continue;
+
mconf = mt792x_vif_to_link(mvif, i);
mt76_connac_mcu_uni_add_dev(&dev->mphy, bss_conf, &mconf->mt76,
--
2.43.0
reply other threads:[~2026-06-16 16:10 UTC|newest]
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