[04/17] wifi: iwlwifi: mvm: fix active link counting during recovery

Commit Message

Korenblit, Miriam Rachel March 20, 2024, 9:26 p.m. UTC

From: Benjamin Berg <[e-mail]>

During recovery, the chanctx_conf in mac80211 is still non-NULL even
though the channel context has not yet been assigned again. In that
case, the real count is actually lower.

Switch to instead count the phy_ctx assignment and ensure that the
assignment is cleared at the start of recovery.

Fixes: 12bacfc2c065 ("wifi: iwlwifi: handle eSR transitions")
Signed-off-by: Benjamin Berg <[e-mail]>
Reviewed-by: Johannes Berg <[e-mail]>
Signed-off-by: Miri Korenblit <[e-mail]>
---
 .../wireless/intel/iwlwifi/mvm/mld-mac80211.c | 20 ++++++++-----------
 1 file changed, 8 insertions(+), 12 deletions(-)

Patch

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mld-mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mld-mac80211.c
index 084314bf6f36..d18304ac126c 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mld-mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mld-mac80211.c
@@ -189,17 +189,13 @@  static void iwl_mvm_mld_mac_remove_interface(struct ieee80211_hw *hw,
 	mutex_unlock(&mvm->mutex);
 }
 
-static unsigned int iwl_mvm_mld_count_active_links(struct ieee80211_vif *vif)
+static unsigned int iwl_mvm_mld_count_active_links(struct iwl_mvm_vif *mvmvif)
 {
 	unsigned int n_active = 0;
 	int i;
 
 	for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++) {
-		struct ieee80211_bss_conf *link_conf;
-
-		link_conf = link_conf_dereference_protected(vif, i);
-		if (link_conf &&
-		    rcu_access_pointer(link_conf->chanctx_conf))
+		if (mvmvif->link[i] && mvmvif->link[i]->phy_ctxt)
 			n_active++;
 	}
 
@@ -245,18 +241,18 @@  __iwl_mvm_mld_assign_vif_chanctx(struct iwl_mvm *mvm,
 {
 	u16 *phy_ctxt_id = (u16 *)ctx->drv_priv;
 	struct iwl_mvm_phy_ctxt *phy_ctxt = &mvm->phy_ctxts[*phy_ctxt_id];
-	unsigned int n_active = iwl_mvm_mld_count_active_links(vif);
 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
+	unsigned int n_active = iwl_mvm_mld_count_active_links(mvmvif);
 	unsigned int link_id = link_conf->link_id;
 	int ret;
 
-	/* if the assigned one was not counted yet, count it now */
-	if (!rcu_access_pointer(link_conf->chanctx_conf))
-		n_active++;
-
 	if (WARN_ON_ONCE(!mvmvif->link[link_id]))
 		return -EINVAL;
 
+	/* if the assigned one was not counted yet, count it now */
+	if (!mvmvif->link[link_id]->phy_ctxt)
+		n_active++;
+
 	/* mac parameters such as HE support can change at this stage
 	 * For sta, need first to configure correct state from drv_sta_state
 	 * and only after that update mac config.
@@ -416,7 +412,7 @@  __iwl_mvm_mld_unassign_vif_chanctx(struct iwl_mvm *mvm,
 
 {
 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
-	unsigned int n_active = iwl_mvm_mld_count_active_links(vif);
+	unsigned int n_active = iwl_mvm_mld_count_active_links(mvmvif);
 	unsigned int link_id = link_conf->link_id;
 
 	/* shouldn't happen, but verify link_id is valid before accessing */