wifi: mt76: mt7996: Clear wcid pointer in mt7996_mac_sta_deinit_link()

[ Upstream commit 8897324 ]

Clear WCID pointer removing the sta link in mt7996_mac_sta_deinit_link
routine.

Fixes: dd82a9e ("wifi: mt76: mt7996: Rely on mt7996_sta_link in sta_add/sta_remove callbacks")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://patch.msgid.link/20251205-mt76-txq-wicd-fix-v2-4-f19ba48af7c1@kernel.org
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: LorenzoBianconi

drivers/net/wireless/mediatek/mt76/mt7996/main.c

@@ -1043,6 +1043,7 @@ void mt7996_mac_sta_deinit_link(struct mt7996_dev *dev,
 		list_del_init(&msta_link->rc_list);
 	spin_unlock_bh(&dev->mt76.sta_poll_lock);
 
+	rcu_assign_pointer(dev->mt76.wcid[msta_link->wcid.idx], NULL);
 	mt76_wcid_cleanup(&dev->mt76, &msta_link->wcid);
 	mt76_wcid_mask_clear(dev->mt76.wcid_mask, msta_link->wcid.idx);
 }