mac80211: fix AP powersave issues introduced in the last wireless-testing update (FS#241)

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

package/kernel/mac80211/patches/321-mac80211-fix-broken-AP-mode-handling-of-powersave-cl.patch

@@ -0,0 +1,27 @@
+From: Felix Fietkau <nbd@nbd.name>
+Date: Thu, 3 Nov 2016 10:47:21 +0100
+Subject: [PATCH] mac80211: fix broken AP mode handling of powersave clients
+
+Commit c68df2e7be0c ("mac80211: allow using AP_LINK_PS with
+mac80211-generated TIM IE") introduced a logic error, where
+__sta_info_recalc_tim turns into a no-op if local->ops->set_tim is not
+set. This prevents the beacon TIM bit from being set for all drivers
+that do not implement this op (almost all of them), thus thoroughly
+essential AP mode powersave functionality.
+
+Cc: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
+Fixes: c68df2e7be0c ("mac80211: allow using AP_LINK_PS with mac80211-generated TIM IE")
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- a/net/mac80211/sta_info.c
++++ b/net/mac80211/sta_info.c
+@@ -688,7 +688,7 @@ static void __sta_info_recalc_tim(struct
+ 	}
+ 
+ 	/* No need to do anything if the driver does all */
+-	if (!local->ops->set_tim)
++	if (local->ops->set_tim)
+ 		return;
+ 
+ 	if (sta->dead)