[4.2.y-ckt stable] Patch "mac80211: fix ibss scan parameters" has been added to the 4.2.y-ckt tree

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    mac80211: fix ibss scan parameters

to the linux-4.2.y-queue branch of the 4.2.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-4.2.y-queue

This patch is scheduled to be released in version 4.2.8-ckt7.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 4.2.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

---8<------------------------------------------------------------

>From a538f8cc4847edc543874cd4e89762296fc0c6a5 Mon Sep 17 00:00:00 2001
From: Sara Sharon <sara.sharon at intel.com>
Date: Mon, 25 Jan 2016 15:46:35 +0200
Subject: mac80211: fix ibss scan parameters

commit d321cd014e51baab475efbdec468255b9e0ec822 upstream.

When joining IBSS a full scan should be initiated in order to search
for existing cell, unless the fixed_channel parameter was set.
A default channel to create the IBSS on if no cell was found is
provided as well.
However - a scan is initiated only on the default channel provided
regardless of whether ifibss->fixed_channel is set or not, with the
obvious result of the cell not joining existing IBSS cell that is
on another channel.

Fixes: 76bed0f43b27 ("mac80211: IBSS fix scan request")
Signed-off-by: Sara Sharon <sara.sharon at intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach at intel.com>
Signed-off-by: Johannes Berg <johannes.berg at intel.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 net/mac80211/ibss.c | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index 20fa58e..f45c4f8 100644
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -7,6 +7,7 @@
  * Copyright 2007, Michael Wu <flamingice at sourmilk.net>
  * Copyright 2009, Johannes Berg <johannes at sipsolutions.net>
  * Copyright 2013-2014  Intel Mobile Communications GmbH
+ * Copyright(c) 2016 Intel Deutschland GmbH
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -1482,14 +1483,21 @@ static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)

 		sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");

-		num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
-							 &ifibss->chandef,
-							 channels,
-							 ARRAY_SIZE(channels));
 		scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
-		ieee80211_request_ibss_scan(sdata, ifibss->ssid,
-					    ifibss->ssid_len, channels, num,
-					    scan_width);
+
+		if (ifibss->fixed_channel) {
+			num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy,
+								 &ifibss->chandef,
+								 channels,
+								 ARRAY_SIZE(channels));
+			ieee80211_request_ibss_scan(sdata, ifibss->ssid,
+						    ifibss->ssid_len, channels,
+						    num, scan_width);
+		} else {
+			ieee80211_request_ibss_scan(sdata, ifibss->ssid,
+						    ifibss->ssid_len, NULL,
+						    0, scan_width);
+		}
 	} else {
 		int interval = IEEE80211_SCAN_INTERVAL;

--
2.7.4