[PATCH 1/3] cfg80211: allow reprocessing of pending requests

["Luis R. Rodriguez" <mcgrof@do-not-panic.com>]

In certain situations we want to trigger reprocessing
of the last regulatory hint. One situation in which
this makes sense is the case where the cfg80211 was
built-in to the kernel, CFG80211_INTERNAL_REGDB was not
enabled and the CRDA binary is on a partition not availble
during early boot. In such a case we want to be able to
re-process the same request at some other point.

When we are asked to re-process the same request we need
to be careful to not kfree it, addresses that.

Reported-by: Sander Eikelenboom <linux@eikelenboom.it>
Signed-off-by: Luis R. Rodriguez <mcgrof@do-not-panic.com>
---
 net/wireless/reg.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index b95e9cf..f5b120f 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -240,19 +240,21 @@ static char user_alpha2[2];
 module_param(ieee80211_regdom, charp, 0444);
 MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
 
-static void reg_kfree_last_request(void)
+static void reg_kfree_last_request(struct regulatory_request *lr)
 {
-	struct regulatory_request *lr;
-
-	lr = get_last_request();
-
 	if (lr != &core_request_world && lr)
 		kfree_rcu(lr, rcu_head);
 }
 
 static void reg_update_last_request(struct regulatory_request *request)
 {
-	reg_kfree_last_request();
+	struct regulatory_request *lr;
+
+	lr = get_last_request();
+	if (lr == request)
+		return;
+
+	reg_kfree_last_request(lr);
 	rcu_assign_pointer(last_request, request);
 }
 
-- 
1.8.5.3