From: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Date: Sun, 10 Feb 2013 13:55:20 +0000 (+0200)
Subject: mac80211: allow driver to be stateless wrt. SMSP requests
X-Git-Tag: submit/tizen_common/20140905.094502~3339^2~28^2^2~26^2~53
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=66d575705154525c33ab99b5f9ac2d246c348db6;p=sdk%2Femulator%2Femulator-kernel.git

mac80211: allow driver to be stateless wrt. SMSP requests

Bail out if no update is made to the SMPS state. This
allows the driver to avoid duplicating the state.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---

diff --git a/net/mac80211/ht.c b/net/mac80211/ht.c
index 61ac7c4..9e7560b 100644
--- a/net/mac80211/ht.c
+++ b/net/mac80211/ht.c
@@ -406,6 +406,9 @@ void ieee80211_request_smps(struct ieee80211_vif *vif,
 	if (WARN_ON(smps_mode == IEEE80211_SMPS_OFF))
 		smps_mode = IEEE80211_SMPS_AUTOMATIC;
 
+	if (sdata->u.mgd.driver_smps_mode == smps_mode)
+		return;
+
 	sdata->u.mgd.driver_smps_mode = smps_mode;
 
 	ieee80211_queue_work(&sdata->local->hw,