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[PATCH] mac80211: allow driver to be stateless wrt. SMSP requests

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From: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>

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@xxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
 net/mac80211/ht.c | 3 +++
 1 file changed, 3 insertions(+)

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,
-- 
1.8.0

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