linux-kernel - [PATCH 43/97] mac80211: Fix IBSS merge

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Date:	Mon,  4 Jan 2010 16:32:56 -0800
From:	Greg Kroah-Hartman <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org,
	stable-review@...nel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Sujith <Sujith.Manoharan@...eros.com>,
	"John W. Linville" <linville@...driver.com>,
	Luis Rodriguez <lrodriguez@...eros.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH 43/97] mac80211: Fix IBSS merge

From: Sujith <Sujith.Manoharan@...eros.com>

commit 450aae3d7b60a970f266349a837dfb30a539198b upstream.

Currently, in IBSS mode, a single creator would go into
a loop trying to merge/scan. This happens because the IBSS timer is
rearmed on finishing a scan and the subsequent
timer invocation requests another scan immediately.

This patch fixes this issue by checking if we have just completed
a scan run trying to merge with other IBSS networks.

Signed-off-by: Sujith <Sujith.Manoharan@...eros.com>
Signed-off-by: John W. Linville <linville@...driver.com>
Cc: Luis Rodriguez <lrodriguez@...eros.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 net/mac80211/ibss.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index f1362f3..fbffce9 100644
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -455,6 +455,10 @@ static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
 
 	ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
 
+	if (time_before(jiffies, ifibss->last_scan_completed +
+		       IEEE80211_IBSS_MERGE_INTERVAL))
+		return;
+
 	if (ieee80211_sta_active_ibss(sdata))
 		return;
 
-- 
1.6.6

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