wifi: ath11k: rely on mac80211 debugfs handling for vif

mac80211 started to delete debugfs entries in certain cases, causing a
ath11k to crash when it tried to delete the entries later. Fix this by
relying on mac80211 to delete the entries when appropriate and adding
them from the vif_add_debugfs handler.

Fixes: 0a3d898 ("wifi: mac80211: add/remove driver debugfs entries as appropriate")
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218364
Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Acked-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/20240115101805.1277949-1-benjamin@sipsolutions.net

Author: benzea

drivers/net/wireless/ath/ath11k/core.h

@@ -368,10 +368,6 @@ struct ath11k_vif {
 	struct ieee80211_chanctx_conf chanctx;
 	struct ath11k_arp_ns_offload arp_ns_offload;
 	struct ath11k_rekey_data rekey_data;
-
-#ifdef CONFIG_ATH11K_DEBUGFS
-	struct dentry *debugfs_twt;
-#endif /* CONFIG_ATH11K_DEBUGFS */
 };
 
 struct ath11k_vif_iter {

drivers/net/wireless/ath/ath11k/debugfs.c

@@ -1893,35 +1893,30 @@ static const struct file_operations ath11k_fops_twt_resume_dialog = {
 	.open = simple_open
 };
 
-void ath11k_debugfs_add_interface(struct ath11k_vif *arvif)
+void ath11k_debugfs_op_vif_add(struct ieee80211_hw *hw,
+			       struct ieee80211_vif *vif)
 {
+	struct ath11k_vif *arvif = ath11k_vif_to_arvif(vif);
 	struct ath11k_base *ab = arvif->ar->ab;
+	struct dentry *debugfs_twt;
 
 	if (arvif->vif->type != NL80211_IFTYPE_AP &&
 	    !(arvif->vif->type == NL80211_IFTYPE_STATION &&
 	      test_bit(WMI_TLV_SERVICE_STA_TWT, ab->wmi_ab.svc_map)))
 		return;
 
-	arvif->debugfs_twt = debugfs_create_dir("twt",
-						arvif->vif->debugfs_dir);
-	debugfs_create_file("add_dialog", 0200, arvif->debugfs_twt,
+	debugfs_twt = debugfs_create_dir("twt",
+					 arvif->vif->debugfs_dir);
+	debugfs_create_file("add_dialog", 0200, debugfs_twt,
 			    arvif, &ath11k_fops_twt_add_dialog);
 
-	debugfs_create_file("del_dialog", 0200, arvif->debugfs_twt,
+	debugfs_create_file("del_dialog", 0200, debugfs_twt,
 			    arvif, &ath11k_fops_twt_del_dialog);
 
-	debugfs_create_file("pause_dialog", 0200, arvif->debugfs_twt,
+	debugfs_create_file("pause_dialog", 0200, debugfs_twt,
 			    arvif, &ath11k_fops_twt_pause_dialog);
 
-	debugfs_create_file("resume_dialog", 0200, arvif->debugfs_twt,
+	debugfs_create_file("resume_dialog", 0200, debugfs_twt,
 			    arvif, &ath11k_fops_twt_resume_dialog);
 }
 
-void ath11k_debugfs_remove_interface(struct ath11k_vif *arvif)
-{
-	if (!arvif->debugfs_twt)
-		return;
-
-	debugfs_remove_recursive(arvif->debugfs_twt);
-	arvif->debugfs_twt = NULL;
-}

drivers/net/wireless/ath/ath11k/debugfs.h

@@ -306,8 +306,8 @@ static inline int ath11k_debugfs_rx_filter(struct ath11k *ar)
 	return ar->debug.rx_filter;
 }
 
-void ath11k_debugfs_add_interface(struct ath11k_vif *arvif);
-void ath11k_debugfs_remove_interface(struct ath11k_vif *arvif);
+void ath11k_debugfs_op_vif_add(struct ieee80211_hw *hw,
+			       struct ieee80211_vif *vif);
 void ath11k_debugfs_add_dbring_entry(struct ath11k *ar,
 				     enum wmi_direct_buffer_module id,
 				     enum ath11k_dbg_dbr_event event,
@@ -386,14 +386,6 @@ static inline int ath11k_debugfs_get_fw_stats(struct ath11k *ar,
 	return 0;
 }
 
-static inline void ath11k_debugfs_add_interface(struct ath11k_vif *arvif)
-{
-}
-
-static inline void ath11k_debugfs_remove_interface(struct ath11k_vif *arvif)
-{
-}
-
 static inline void
 ath11k_debugfs_add_dbring_entry(struct ath11k *ar,
 				enum wmi_direct_buffer_module id,

drivers/net/wireless/ath/ath11k/mac.c

@@ -6750,13 +6750,6 @@ static int ath11k_mac_op_add_interface(struct ieee80211_hw *hw,
 		goto err;
 	}
 
-	/* In the case of hardware recovery, debugfs files are
-	 * not deleted since ieee80211_ops.remove_interface() is
-	 * not invoked. In such cases, try to delete the files.
-	 * These will be re-created later.
-	 */
-	ath11k_debugfs_remove_interface(arvif);
-
 	memset(arvif, 0, sizeof(*arvif));
 
 	arvif->ar = ar;
@@ -6933,8 +6926,6 @@ static int ath11k_mac_op_add_interface(struct ieee80211_hw *hw,
 
 	ath11k_dp_vdev_tx_attach(ar, arvif);
 
-	ath11k_debugfs_add_interface(arvif);
-
 	if (vif->type != NL80211_IFTYPE_MONITOR &&
 	    test_bit(ATH11K_FLAG_MONITOR_CONF_ENABLED, &ar->monitor_flags)) {
 		ret = ath11k_mac_monitor_vdev_create(ar);
@@ -7050,8 +7041,6 @@ static void ath11k_mac_op_remove_interface(struct ieee80211_hw *hw,
 	/* Recalc txpower for remaining vdev */
 	ath11k_mac_txpower_recalc(ar);
 
-	ath11k_debugfs_remove_interface(arvif);
-
 	/* TODO: recal traffic pause state based on the available vdevs */
 
 	mutex_unlock(&ar->conf_mutex);
@@ -9149,6 +9138,7 @@ static const struct ieee80211_ops ath11k_ops = {
 #endif
 
 #ifdef CONFIG_ATH11K_DEBUGFS
+	.vif_add_debugfs		= ath11k_debugfs_op_vif_add,
 	.sta_add_debugfs		= ath11k_debugfs_sta_op_add,
 #endif