ath: relax regulatory rules for default regd code

Most AP devices out there do not have a properly programmed regulatory
domain code, which means they are limited to US frequencies by default.

This has been a major annoyance for a long time now. Since no fix for
the manfuacturing process seems to be forthcoming, the only sane option
seems to be to allow users to change the country code in such cases.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 45252

package/kernel/mac80211/patches/406-ath_relax_default_regd.patch

@@ -0,0 +1,47 @@
+--- a/drivers/net/wireless/ath/regd.c
++++ b/drivers/net/wireless/ath/regd.c
+@@ -114,10 +114,22 @@ static const struct ieee80211_regdomain 
+ 	)
+ };
+ 
++static u16 ath_regd_get_eepromRD(struct ath_regulatory *reg)
++{
++	return reg->current_rd & ~WORLDWIDE_ROAMING_FLAG;
++}
++
++static bool is_default_regd(struct ath_regulatory *reg)
++{
++	return ath_regd_get_eepromRD(reg) == CTRY_DEFAULT;
++}
++
+ static bool dynamic_country_user_possible(struct ath_regulatory *reg)
+ {
+ 	if (config_enabled(CPTCFG_ATH_REG_DYNAMIC_USER_CERT_TESTING))
+ 		return true;
++	if (is_default_regd(reg))
++		return true;
+ 
+ 	switch (reg->country_code) {
+ 	case CTRY_UNITED_STATES:
+@@ -202,11 +214,6 @@ static inline bool is_wwr_sku(u16 regd)
+ 		(regd == WORLD));
+ }
+ 
+-static u16 ath_regd_get_eepromRD(struct ath_regulatory *reg)
+-{
+-	return reg->current_rd & ~WORLDWIDE_ROAMING_FLAG;
+-}
+-
+ bool ath_is_world_regd(struct ath_regulatory *reg)
+ {
+ 	return is_wwr_sku(ath_regd_get_eepromRD(reg));
+@@ -650,6 +657,9 @@ ath_regd_init_wiphy(struct ath_regulator
+ 	return 0;
+ #endif
+ 
++	if (is_default_regd(reg))
++		return 0;
++
+ 	wiphy->regulatory_flags |= REGULATORY_STRICT_REG |
+ 				   REGULATORY_CUSTOM_REG;
+