linux-kernel - [PATCH 3.10 40/78] Revert "mac80211: allow disable power save in mesh"

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Date:	Wed, 18 Dec 2013 13:11:08 -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, Bob Copeland <me@...copeland.com>,
	Johannes Berg <johannes.berg@...el.com>
Subject: [PATCH 3.10 40/78] Revert "mac80211: allow disable power save in mesh"

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

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

From: Bob Copeland <me@...copeland.com>

commit 2d3db210860f1df099a35b1dd54cca35454e0361 upstream.

This reverts commit ee1f668136b2fb6640ee2d54c2a525ea41f98211.

The aformentioned commit added a check to allow
'iw wlan0 set power_save off' to work for mesh interfaces.

However, this is problematic because it also allows
'iw wlan0 set power_save on', which will crash in short order
because all of the subsequent code manipulates sdata->u.mgd.

The power-saving states for mesh interfaces can be manipulated
through the mesh config, e.g:
'iw wlan0 set mesh_param mesh_power_save=active' (which,
despite the name, actualy disables power saving since the
setting refers to the type of sleep the interface undergoes).

Fixes: ee1f668136b2 ("mac80211: allow disable power save in mesh")
Signed-off-by: Bob Copeland <me@...copeland.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/mac80211/cfg.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -2356,8 +2356,7 @@ static int ieee80211_set_power_mgmt(stru
 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);

-	if (sdata->vif.type != NL80211_IFTYPE_STATION &&
-	    sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
+	if (sdata->vif.type != NL80211_IFTYPE_STATION)
 		return -EOPNOTSUPP;

 	if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))

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