wifi: iwlwifi: mvm: fix regdb initialization

In order to get regulatory domain, driver sends MCC_UPDATE_CMD to the
FW. One of the parameters in the response is the status which can tell
if the regdomain has changed or not.

When iwl_mvm_init_mcc() is called during iwl_op_mode_mvm_start(), then
sband is still NULL and channel parameters (i.e. chan->flags)  cannot be
initialized. When, further in the flow, iwl_mvm_update_mcc() is called
during iwl_mvm_up(), it first checks if the regdomain has changed and
then skips the update if it remains the same. But, since channel
parameters weren't initialized yet, the update should be forced in this
codepath. Fix that by adding a corresponding parameter to
iwl_mvm_init_fw_regd().

Signed-off-by: Gregory Greenman <[email protected]>
Link: https://lore.kernel.org/r/20231017115047.78b2c5b891b0.Iac49d52e0bfc0317372015607c63ea9276bbb188@changeid
Signed-off-by: Johannes Berg <[email protected]>

Author: ggreenma

drivers/net/wireless/intel/iwlwifi/mvm/d3.c

@@ -818,7 +818,7 @@ static int iwl_mvm_d3_reprogram(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 	if (ret)
 		IWL_ERR(mvm, "Failed to send quota: %d\n", ret);
 
-	if (iwl_mvm_is_lar_supported(mvm) && iwl_mvm_init_fw_regd(mvm))
+	if (iwl_mvm_is_lar_supported(mvm) && iwl_mvm_init_fw_regd(mvm, false))
 		IWL_ERR(mvm, "Failed to initialize D3 LAR information\n");
 
 	return 0;

drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c

@@ -186,7 +186,7 @@ struct ieee80211_regdomain *iwl_mvm_get_current_regdomain(struct iwl_mvm *mvm,
 				     MCC_SOURCE_OLD_FW, changed);
 }
 
-int iwl_mvm_init_fw_regd(struct iwl_mvm *mvm)
+int iwl_mvm_init_fw_regd(struct iwl_mvm *mvm, bool force_regd_sync)
 {
 	enum iwl_mcc_source used_src;
 	struct ieee80211_regdomain *regd;
@@ -213,8 +213,10 @@ int iwl_mvm_init_fw_regd(struct iwl_mvm *mvm)
 	if (IS_ERR_OR_NULL(regd))
 		return -EIO;
 
-	/* update cfg80211 if the regdomain was changed */
-	if (changed)
+	/* update cfg80211 if the regdomain was changed or the caller explicitly
+	 * asked to update regdomain
+	 */
+	if (changed || force_regd_sync)
 		ret = regulatory_set_wiphy_regd_sync(mvm->hw->wiphy, regd);
 	else
 		ret = 0;

drivers/net/wireless/intel/iwlwifi/mvm/mvm.h

@@ -2241,7 +2241,7 @@ struct ieee80211_regdomain *iwl_mvm_get_regdomain(struct wiphy *wiphy,
 						  bool *changed);
 struct ieee80211_regdomain *iwl_mvm_get_current_regdomain(struct iwl_mvm *mvm,
 							  bool *changed);
-int iwl_mvm_init_fw_regd(struct iwl_mvm *mvm);
+int iwl_mvm_init_fw_regd(struct iwl_mvm *mvm, bool force_regd_sync);
 void iwl_mvm_update_changed_regdom(struct iwl_mvm *mvm);
 
 /* smart fifo */

drivers/net/wireless/intel/iwlwifi/mvm/nvm.c

@@ -573,7 +573,7 @@ int iwl_mvm_init_mcc(struct iwl_mvm *mvm)
 	 * try to replay the last set MCC to FW. If it doesn't exist,
 	 * queue an update to cfg80211 to retrieve the default alpha2 from FW.
 	 */
-	retval = iwl_mvm_init_fw_regd(mvm);
+	retval = iwl_mvm_init_fw_regd(mvm, true);
 	if (retval != -ENOENT)
 		return retval;