[PATCH 6.12.y v3 1/3] wifi: mt76: mt7921: avoid undesired changes of the preset regulatory domain

[Ajrat Makhmutov <rauty@altlinux.org>]

From: Leon Yen <leon.yen@mediatek.com>

commit 2425dc7beaadc39c2636f97f8bdc22dc3cf88149 upstream.

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: Ajrat Makhmutov <rauty@altlinux.org>
---
v2: drop redundant "cherry picked from" trailer; add backporter
    Signed-off-by. No code change.
v3: add cover letter with upstream/stable references; mark target 6.12.y.

 drivers/net/wireless/mediatek/mt76/mt7921/init.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/init.c b/drivers/net/wireless/mediatek/mt76/mt7921/init.c
index 4bd533c4ba9a1..276dfb9c26e0d 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/init.c
+++ b/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;
 
-- 
2.50.1