cfg80211: reg: remove support for built-in regdb

Parsing and building C structures from a regdb is no longer needed
since the "firmware" file (regulatory.db) can be linked into the
kernel image to achieve the same effect.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Documentation/networking/regulatory.txt

@@ -200,23 +200,5 @@ Then in some part of your code after your wiphy has been registered:
 Statically compiled regulatory database
 ---------------------------------------
 
-In most situations the userland solution using CRDA as described
-above is the preferred solution.  However in some cases a set of
-rules built into the kernel itself may be desirable.  To account
-for this situation, a configuration option has been provided
-(i.e. CONFIG_CFG80211_INTERNAL_REGDB).  With this option enabled,
-the wireless database information contained in net/wireless/db.txt is
-used to generate a data structure encoded in net/wireless/regdb.c.
-That option also enables code in net/wireless/reg.c which queries
-the data in regdb.c as an alternative to using CRDA.
-
-The file net/wireless/db.txt should be kept up-to-date with the db.txt
-file available in the git repository here:
-
-    git://git.kernel.org/pub/scm/linux/kernel/git/sforshee/wireless-regdb.git
-
-Again, most users in most situations should be using the CRDA package
-provided with their distribution, and in most other situations users
-should be building and using CRDA on their own rather than using
-this option.  If you are not absolutely sure that you should be using
-CONFIG_CFG80211_INTERNAL_REGDB then _DO_NOT_USE_IT_.
+When a database should be fixed into the kernel, it can be provided as a
+firmware file at build time that is then linked into the kernel.

net/wireless/Kconfig

@@ -140,30 +140,8 @@ config CFG80211_DEBUGFS
 
 	  If unsure, say N.
 
-config CFG80211_INTERNAL_REGDB
-	bool "use statically compiled regulatory rules database" if EXPERT
-	default n
-	depends on CFG80211
-	---help---
-	  This option generates an internal data structure representing
-	  the wireless regulatory rules described in net/wireless/db.txt
-	  and includes code to query that database. This is an alternative
-	  to using CRDA for defining regulatory rules for the kernel.
-
-	  Using this option requires some parsing of the db.txt at build time,
-	  the parser will be upkept with the latest wireless-regdb updates but
-	  older wireless-regdb formats will be ignored. The parser may later
-	  be replaced to avoid issues with conflicts on versions of
-	  wireless-regdb.
-
-	  For details see:
-
-	  http://wireless.kernel.org/en/developers/Regulatory
-
-	  Most distributions have a CRDA package. So if unsure, say N.
-
 config CFG80211_CRDA_SUPPORT
-	bool "support CRDA" if CFG80211_INTERNAL_REGDB
+	bool "support CRDA" if EXPERT
 	default y
 	depends on CFG80211
 	help

net/wireless/Makefile

@@ -14,11 +14,5 @@ cfg80211-y += mlme.o ibss.o sme.o chan.o ethtool.o mesh.o ap.o trace.o ocb.o
 cfg80211-$(CONFIG_OF) += of.o
 cfg80211-$(CONFIG_CFG80211_DEBUGFS) += debugfs.o
 cfg80211-$(CONFIG_CFG80211_WEXT) += wext-compat.o wext-sme.o
-cfg80211-$(CONFIG_CFG80211_INTERNAL_REGDB) += regdb.o
 
 CFLAGS_trace.o := -I$(src)
-
-$(obj)/regdb.c: $(src)/db.txt $(src)/genregdb.awk
-	@$(AWK) -f $(srctree)/$(src)/genregdb.awk < $< > $@
-
-clean-files := regdb.c

net/wireless/reg.c

@@ -59,7 +59,6 @@
 #include "core.h"
 #include "reg.h"
 #include "rdev-ops.h"
-#include "regdb.h"
 #include "nl80211.h"
 
 /*
@@ -495,38 +494,6 @@ static int reg_schedule_apply(const struct ieee80211_regdomain *regdom)
 	return 0;
 }
 
-#ifdef CONFIG_CFG80211_INTERNAL_REGDB
-static int reg_query_builtin(const char *alpha2)
-{
-	const struct ieee80211_regdomain *regdom = NULL;
-	unsigned int i;
-
-	for (i = 0; i < reg_regdb_size; i++) {
-		if (alpha2_equal(alpha2, reg_regdb[i]->alpha2)) {
-			regdom = reg_copy_regd(reg_regdb[i]);
-			break;
-		}
-	}
-	if (!regdom)
-		return -ENODATA;
-
-	return reg_schedule_apply(regdom);
-}
-
-/* Feel free to add any other sanity checks here */
-static void reg_regdb_size_check(void)
-{
-	/* We should ideally BUILD_BUG_ON() but then random builds would fail */
-	WARN_ONCE(!reg_regdb_size, "db.txt is empty, you should update it...");
-}
-#else
-static inline void reg_regdb_size_check(void) {}
-static inline int reg_query_builtin(const char *alpha2)
-{
-	return -ENODATA;
-}
-#endif /* CONFIG_CFG80211_INTERNAL_REGDB */
-
 #ifdef CONFIG_CFG80211_CRDA_SUPPORT
 /* Max number of consecutive attempts to communicate with CRDA  */
 #define REG_MAX_CRDA_TIMEOUTS 10
@@ -885,10 +852,6 @@ int reg_reload_regdb(void)
 
 static bool reg_query_database(struct regulatory_request *request)
 {
-	/* query internal regulatory database (if it exists) */
-	if (reg_query_builtin(request->alpha2) == 0)
-		return true;
-
 	if (query_regdb_file(request->alpha2) == 0)
 		return true;
 
@@ -3580,8 +3543,6 @@ int __init regulatory_init(void)
 	spin_lock_init(&reg_pending_beacons_lock);
 	spin_lock_init(&reg_indoor_lock);
 
-	reg_regdb_size_check();
-
 	rcu_assign_pointer(cfg80211_regdomain, cfg80211_world_regdom);
 
 	user_alpha2[0] = '9';