linux-kernel - [PATCH 3.17 060/141] mac80211: schedule the actual switch of the station before CSA count 0

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Message-Id: <20141119205152.641502085@linuxfoundation.org>
Date:	Wed, 19 Nov 2014 12:51:23 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Jouni Malinen <j@...fi>,
	Luciano Coelho <luciano.coelho@...el.com>,
	Johannes Berg <johannes.berg@...el.com>
Subject: [PATCH 3.17 060/141] mac80211: schedule the actual switch of the station before CSA count 0

3.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Luciano Coelho <luciano.coelho@...el.com>

commit ff1e417c7c239b7abfe70aa90460a77eaafc7f83 upstream.

Due to the time it takes to process the beacon that started the CSA
process, we may be late for the switch if we try to reach exactly
beacon 0.  To avoid that, use count - 1 when calculating the switch time.

Reported-by: Jouni Malinen <j@...fi>
Signed-off-by: Luciano Coelho <luciano.coelho@...el.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/mac80211/mlme.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -1154,7 +1154,8 @@ ieee80211_sta_process_chanswitch(struct
 		ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
 	else
 		mod_timer(&ifmgd->chswitch_timer,
-			  TU_TO_EXP_TIME(csa_ie.count * cbss->beacon_interval));
+			  TU_TO_EXP_TIME((csa_ie.count - 1) *
+					 cbss->beacon_interval));
 }
 
 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,


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