[PATCH] wifi: rtw89: regd: fix ww domain blocking on 6GHz

[Matthew Leach]

The current code keeps a separate instance for the ww reg domain outside
the static map, and treats rtw89_regd_get_index() returning
RTW89_REGD_MAX_COUNTRY_NUM as the index for the ww domain. This
conflates the "not found" sentinel with a real index and causes the
block_* bitmap lookups to skip ww entirely, explicitly blocking 6GHz on
the ww domain rather than deferring to the kernel regulatory policy.

Fold the standalone rtw89_ww_regd into rtw89_regd_map[0] and drop the
special case in rtw89_regd_get_index() that returned
RTW89_REGD_MAX_COUNTRY_NUM for ww. rtw89_regd_find_reg_by_name() now
returns NULL on miss, and its callers either translate that into the
RTW89_REGD_MAX_COUNTRY_NUM sentinel (rtw89_regd_get_index_by_name()) or
fall back to the ww entry explicitly (rtw89_regd_notifier_apply()). With
ww living at a real index, the block-list checks apply and 6GHz is no
longer unconditionally blocked for ww.

Signed-off-by: Matthew Leach <matthew.leach@xxxxxxxxxxxxx>
---
 drivers/net/wireless/realtek/rtw89/regd.c | 28 ++++++++++++++++++----------
 1 file changed, 18 insertions(+), 10 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtw89/regd.c b/drivers/net/wireless/realtek/rtw89/regd.c
index 28466cb35ea2..698b8b7f6129 100644
--- a/drivers/net/wireless/realtek/rtw89/regd.c
+++ b/drivers/net/wireless/realtek/rtw89/regd.c
@@ -21,10 +21,8 @@ void rtw89_regd_notifier(struct wiphy *wiphy, struct regulatory_request *request
 
 static_assert(BITS_PER_TYPE(unsigned long) >= NUM_OF_RTW89_REGD_FUNC);
 
-static const struct rtw89_regd rtw89_ww_regd =
-	COUNTRY_REGD("00", RTW89_WW, RTW89_WW, RTW89_WW, 0x0);
-
 static const struct rtw89_regd rtw89_regd_map[] = {
+	COUNTRY_REGD("00", RTW89_WW, RTW89_WW, RTW89_WW, 0x0),
 	COUNTRY_REGD("AR", RTW89_MEXICO, RTW89_MEXICO, RTW89_FCC, 0x0),
 	COUNTRY_REGD("BO", RTW89_FCC, RTW89_FCC, RTW89_NA, 0x0),
 	COUNTRY_REGD("BR", RTW89_FCC, RTW89_FCC, RTW89_FCC, 0x0),
@@ -316,12 +314,13 @@ static const struct rtw89_regd *rtw89_regd_find_reg_by_name(struct rtw89_dev *rt
 			return &regd_ctrl->map[i];
 	}
 
-	return &rtw89_ww_regd;
+	return NULL;
 }
 
 static bool rtw89_regd_is_ww(const struct rtw89_regd *regd)
 {
-	return regd == &rtw89_ww_regd;
+	/* Index 0 in the static map contains the WW domain entry. */
+	return regd == &rtw89_regd_map[0];
 }
 
 static u8 rtw89_regd_get_index(struct rtw89_dev *rtwdev, const struct rtw89_regd *regd)
@@ -331,9 +330,6 @@ static u8 rtw89_regd_get_index(struct rtw89_dev *rtwdev, const struct rtw89_regd
 
 	BUILD_BUG_ON(ARRAY_SIZE(rtw89_regd_map) > RTW89_REGD_MAX_COUNTRY_NUM);
 
-	if (rtw89_regd_is_ww(regd))
-		return RTW89_REGD_MAX_COUNTRY_NUM;
-
 	return regd - regd_ctrl->map;
 }
 
@@ -342,6 +338,10 @@ static u8 rtw89_regd_get_index_by_name(struct rtw89_dev *rtwdev, const char *alp
 	const struct rtw89_regd *regd;
 
 	regd = rtw89_regd_find_reg_by_name(rtwdev, alpha2);
+
+	if (!regd)
+		return RTW89_REGD_MAX_COUNTRY_NUM;
+
 	return rtw89_regd_get_index(rtwdev, regd);
 }
 
@@ -721,7 +721,7 @@ int rtw89_regd_init_hint(struct rtw89_dev *rtwdev)
 		return -EINVAL;
 
 	chip_regd = rtw89_regd_find_reg_by_name(rtwdev, rtwdev->efuse.country_code);
-	if (!rtw89_regd_is_ww(chip_regd)) {
+	if (chip_regd && !rtw89_regd_is_ww(chip_regd)) {
 		rtwdev->regulatory.regd = chip_regd;
 		rtwdev->regulatory.programmed = true;
 
@@ -859,7 +859,15 @@ static void rtw89_regd_notifier_apply(struct rtw89_dev *rtwdev,
 				      struct wiphy *wiphy,
 				      struct regulatory_request *request)
 {
-	rtwdev->regulatory.regd = rtw89_regd_find_reg_by_name(rtwdev, request->alpha2);
+	const struct rtw89_regd *regd = rtw89_regd_find_reg_by_name(rtwdev, request->alpha2);
+
+	if (!regd) {
+		/* Fallback to WW domain if name not found. */
+		regd = &rtw89_regd_map[0];
+	}
+
+	rtwdev->regulatory.regd = regd;
+
 	/* This notification might be set from the system of distros,
 	 * and it does not expect the regulatory will be modified by
 	 * connecting to an AP (i.e. country ie).

---
base-commit: 8cd9520d35a6c38db6567e97dd93b1f11f185dc6
change-id: 20260616-rtw89-6ghz-regd-fixes-d8f816880bd0

Best regards,
--  
Matt