[PATCH mt76 1/9] wifi: mt76: fix vif link allocation

[Lorenzo Bianconi <lorenzo@kernel.org>]

From: Felix Fietkau <nbd@nbd.name>

Reuse the vif deflink for link_id = 0 in order to avoid confusion with
vif->bss_conf, which also gets a link id of 0.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 drivers/net/wireless/mediatek/mt76/channel.c | 4 ++--
 drivers/net/wireless/mediatek/mt76/mt76.h    | 5 ++++-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/channel.c b/drivers/net/wireless/mediatek/mt76/channel.c
index cc2d888e3f17a58512e6282686b446109ec7ab3c..77b75792eb488e9c5da9ca8026c04157182c13a4 100644
--- a/drivers/net/wireless/mediatek/mt76/channel.c
+++ b/drivers/net/wireless/mediatek/mt76/channel.c
@@ -173,13 +173,13 @@ void mt76_unassign_vif_chanctx(struct ieee80211_hw *hw,
 	if (!mlink)
 		goto out;
 
-	if (link_conf != &vif->bss_conf)
+	if (mlink != (struct mt76_vif_link *)vif->drv_priv)
 		rcu_assign_pointer(mvif->link[link_id], NULL);
 
 	dev->drv->vif_link_remove(phy, vif, link_conf, mlink);
 	mlink->ctx = NULL;
 
-	if (link_conf != &vif->bss_conf)
+	if (mlink != (struct mt76_vif_link *)vif->drv_priv)
 		kfree_rcu(mlink, rcu_head);
 
 out:
diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h
index 14927a92f9d1b313253158c0e53dce8fab9fba18..022d83bb03da1803440c942c9343b709d76aecd4 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h
@@ -1865,6 +1865,9 @@ mt76_vif_link(struct mt76_dev *dev, struct ieee80211_vif *vif, int link_id)
 	struct mt76_vif_link *mlink = (struct mt76_vif_link *)vif->drv_priv;
 	struct mt76_vif_data *mvif = mlink->mvif;
 
+	if (!link_id)
+		return mlink;
+
 	return mt76_dereference(mvif->link[link_id], dev);
 }
 
@@ -1875,7 +1878,7 @@ mt76_vif_conf_link(struct mt76_dev *dev, struct ieee80211_vif *vif,
 	struct mt76_vif_link *mlink = (struct mt76_vif_link *)vif->drv_priv;
 	struct mt76_vif_data *mvif = mlink->mvif;
 
-	if (link_conf == &vif->bss_conf)
+	if (link_conf == &vif->bss_conf || !link_conf->link_id)
 		return mlink;
 
 	return mt76_dereference(mvif->link[link_conf->link_id], dev);

-- 
2.50.0