Revert "wifi: iwlwifi: remove retry loops in start"

Revert commit dfdfe4be183b ("wifi: iwlwifi: remove retry loops in
start"), it turns out that there's an issue with the PNVM load
notification from firmware not getting processed, that this patch
has been somewhat successfully papering over. Since this is being
reported, revert the loop removal for now.

We will later at least clean this up to only attempt to retry if
there was a timeout, but currently we don't even bubble up the
failure reason to the correct layer, only returning NULL.

Fixes: dfdfe4be183b ("wifi: iwlwifi: remove retry loops in start")
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Link: https://patch.msgid.link/20241022092212.4aa82a558a00.Ibdeff9c8f0d608bc97fc42024392ae763b6937b7@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

3 files changed, 31 insertions, 10 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-drv.c b/drivers/net/wireless/intel/iwlwifi/iwl-drv.c
index 2abfc986701f..c620911a1193 100644
--- a/drivers/net/wireless/intel/iwlwifi/iwl-drv.c
+++ b/drivers/net/wireless/intel/iwlwifi/iwl-drv.c
@@ -1413,25 +1413,35 @@ _iwl_op_mode_start(struct iwl_drv *drv, struct iwlwifi_opmode_table *op)
 	const struct iwl_op_mode_ops *ops = op->ops;
 	struct dentry *dbgfs_dir = NULL;
 	struct iwl_op_mode *op_mode = NULL;
+	int retry, max_retry = !!iwlwifi_mod_params.fw_restart * IWL_MAX_INIT_RETRY;
 
 	/* also protects start/stop from racing against each other */
 	lockdep_assert_held(&iwlwifi_opmode_table_mtx);
 
+	for (retry = 0; retry <= max_retry; retry++) {
+
 #ifdef CONFIG_IWLWIFI_DEBUGFS
-	drv->dbgfs_op_mode = debugfs_create_dir(op->name,
-						drv->dbgfs_drv);
-	dbgfs_dir = drv->dbgfs_op_mode;
+		drv->dbgfs_op_mode = debugfs_create_dir(op->name,
+							drv->dbgfs_drv);
+		dbgfs_dir = drv->dbgfs_op_mode;
 #endif
 
-	op_mode = ops->start(drv->trans, drv->trans->cfg,
-			     &drv->fw, dbgfs_dir);
-	if (op_mode)
-		return op_mode;
+		op_mode = ops->start(drv->trans, drv->trans->cfg,
+				     &drv->fw, dbgfs_dir);
+
+		if (op_mode)
+			return op_mode;
+
+		if (test_bit(STATUS_TRANS_DEAD, &drv->trans->status))
+			break;
+
+		IWL_ERR(drv, "retry init count %d\n", retry);
 
 #ifdef CONFIG_IWLWIFI_DEBUGFS
-	debugfs_remove_recursive(drv->dbgfs_op_mode);
-	drv->dbgfs_op_mode = NULL;
+		debugfs_remove_recursive(drv->dbgfs_op_mode);
+		drv->dbgfs_op_mode = NULL;
 #endif
+	}
 
 	return NULL;
 }
diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-drv.h b/drivers/net/wireless/intel/iwlwifi/iwl-drv.h
index 1549ff429549..6a1d31892417 100644
--- a/drivers/net/wireless/intel/iwlwifi/iwl-drv.h
+++ b/drivers/net/wireless/intel/iwlwifi/iwl-drv.h
@@ -98,6 +98,9 @@ void iwl_drv_stop(struct iwl_drv *drv);
 #define VISIBLE_IF_IWLWIFI_KUNIT static
 #endif
 
+/* max retry for init flow */
+#define IWL_MAX_INIT_RETRY 2
+
 #define FW_NAME_PRE_BUFSIZE	64
 struct iwl_trans;
 const char *iwl_drv_get_fwname_pre(struct iwl_trans *trans, char *buf);
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index 39b815904501..80b9a115245f 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -1293,12 +1293,14 @@ int iwl_mvm_mac_start(struct ieee80211_hw *hw)
 {
 	struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
 	int ret;
+	int retry, max_retry = 0;
 
 	mutex_lock(&mvm->mutex);
 
 	/* we are starting the mac not in error flow, and restart is enabled */
 	if (!test_bit(IWL_MVM_STATUS_HW_RESTART_REQUESTED, &mvm->status) &&
 	    iwlwifi_mod_params.fw_restart) {
+		max_retry = IWL_MAX_INIT_RETRY;
 		/*
 		 * This will prevent mac80211 recovery flows to trigger during
 		 * init failures
@@ -1306,7 +1308,13 @@ int iwl_mvm_mac_start(struct ieee80211_hw *hw)
 		set_bit(IWL_MVM_STATUS_STARTING, &mvm->status);
 	}
 
-	ret = __iwl_mvm_mac_start(mvm);
+	for (retry = 0; retry <= max_retry; retry++) {
+		ret = __iwl_mvm_mac_start(mvm);
+		if (!ret)
+			break;
+
+		IWL_ERR(mvm, "mac start retry %d\n", retry);
+	}
 	clear_bit(IWL_MVM_STATUS_STARTING, &mvm->status);
 
 	mutex_unlock(&mvm->mutex);