wifi: iwlwifi: mvm: rework debugfs handling

mac80211 added a new callback to add a vif debugfs.
Implement it instead of adding the debugfs directly,
which will make it properly preserved over switching
the vif from non-MLD/MLD and back.

This requires some rework so that we still have the
symlink but trust mac80211 to add/remove the debugfs.

Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20231004123422.818810e242e6.I805a28f9fbef5c52a3a575d04e7a6a909ecf9078@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 15 insertions, 17 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs-vif.c b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs-vif.c
index cb4ecad6103f..3a42fb38b32f 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs-vif.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs-vif.c
@@ -699,19 +699,11 @@ MVM_DEBUGFS_READ_WRITE_FILE_OPS(rx_phyinfo, 10);
 MVM_DEBUGFS_READ_WRITE_FILE_OPS(quota_min, 32);
 MVM_DEBUGFS_READ_FILE_OPS(os_device_timediff);
 
-
-void iwl_mvm_vif_dbgfs_register(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
+void iwl_mvm_vif_add_debugfs(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 {
+	struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
 	struct dentry *dbgfs_dir = vif->debugfs_dir;
 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
-	char buf[100];
-
-	/*
-	 * Check if debugfs directory already exist before creating it.
-	 * This may happen when, for example, resetting hw or suspend-resume
-	 */
-	if (!dbgfs_dir || mvmvif->dbgfs_dir)
-		return;
 
 	mvmvif->dbgfs_dir = debugfs_create_dir("iwlmvm", dbgfs_dir);
 	if (IS_ERR_OR_NULL(mvmvif->dbgfs_dir)) {
@@ -737,6 +729,17 @@ void iwl_mvm_vif_dbgfs_register(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
 	if (vif->type == NL80211_IFTYPE_STATION && !vif->p2p &&
 	    mvmvif == mvm->bf_allowed_vif)
 		MVM_DEBUGFS_ADD_FILE_VIF(bf_params, mvmvif->dbgfs_dir, 0600);
+}
+
+void iwl_mvm_vif_dbgfs_add_link(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
+{
+	struct dentry *dbgfs_dir = vif->debugfs_dir;
+	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
+	char buf[100];
+
+	/* this will happen in monitor mode */
+	if (!dbgfs_dir)
+		return;
 
 	/*
 	 * Create symlink for convenience pointing to interface specific
@@ -745,21 +748,16 @@ void iwl_mvm_vif_dbgfs_register(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
 	 * find
 	 * netdev:wlan0 -> ../../../ieee80211/phy0/netdev:wlan0/iwlmvm/
 	 */
-	snprintf(buf, 100, "../../../%pd3/%pd",
-		 dbgfs_dir,
-		 mvmvif->dbgfs_dir);
+	snprintf(buf, 100, "../../../%pd3/iwlmvm", dbgfs_dir);
 
 	mvmvif->dbgfs_slink = debugfs_create_symlink(dbgfs_dir->d_name.name,
 						     mvm->debugfs_dir, buf);
 }
 
-void iwl_mvm_vif_dbgfs_clean(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
+void iwl_mvm_vif_dbgfs_rm_link(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
 {
 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 
 	debugfs_remove(mvmvif->dbgfs_slink);
 	mvmvif->dbgfs_slink = NULL;
-
-	debugfs_remove_recursive(mvmvif->dbgfs_dir);
-	mvmvif->dbgfs_dir = NULL;
 }