wifi: mt76: mt7921: avoid undesired changes of the preset regulatory domain

JIRA: https://issues.redhat.com/browse/RHEL-79791

commit 2425dc7
Author: Leon Yen <leon.yen@mediatek.com>
Date:   Fri Apr 12 16:53:57 2024 +0800

    wifi: mt76: mt7921: avoid undesired changes of the preset regulatory domain
    
    Some countries have strict RF restrictions where changing the regulatory
    domain dynamically based on the connected AP is not acceptable.
    This patch disables Beacon country IE hinting when a valid country code
    is set from usersland (e.g., by system using iw or CRDA).
    
    Signed-off-by: Leon Yen <leon.yen@mediatek.com>
    Signed-off-by: Ming Yen Hsieh <mingyen.hsieh@mediatek.com>
    Tested-by: David Ruth <druth@chromium.org>
    Link: https://patch.msgid.link/20240412085357.13756-1-mingyen.hsieh@mediatek.com
    Signed-off-by: Felix Fietkau <nbd@nbd.name>

Signed-off-by: Jose Ignacio Tornos Martinez <jtornosm@redhat.com>

Author: jtornosm

drivers/net/wireless/mediatek/mt76/mt7921/init.c

@@ -137,6 +137,13 @@ mt7921_regd_notifier(struct wiphy *wiphy,
 	dev->mt76.region = request->dfs_region;
 	dev->country_ie_env = request->country_ie_env;
 
+	if (request->initiator == NL80211_REGDOM_SET_BY_USER) {
+		if (dev->mt76.alpha2[0] == '0' && dev->mt76.alpha2[1] == '0')
+			wiphy->regulatory_flags &= ~REGULATORY_COUNTRY_IE_IGNORE;
+		else
+			wiphy->regulatory_flags |= REGULATORY_COUNTRY_IE_IGNORE;
+	}
+
 	if (pm->suspended)
 		return;