This is a note to let you know that I've just added the patch titled
cfg80211: fix interface combinations check for ADHOC(IBSS)
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
cfg80211-fix-interface-combinations-check-for-adhoc-ibss.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From paul.gortmaker@xxxxxxxxxxxxx Mon Aug 13 11:39:55 2012
From: Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx>
Date: Thu, 2 Aug 2012 18:55:41 -0400
Subject: cfg80211: fix interface combinations check for ADHOC(IBSS)
To: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
Cc: <linux-wireless@xxxxxxxxxxxxxxx>, <linville@xxxxxxxxxxxxx>, Liang Li <liang.li@xxxxxxxxxxxxx>, <stable@xxxxxxxxxxxxxxx>, Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx>
Message-ID: <1343948141-25005-1-git-send-email-paul.gortmaker@xxxxxxxxxxxxx>
From: Liang Li <liang.li@xxxxxxxxxxxxx>
partial of commit 8e8b41f9d8c8e63fc92f899ace8da91a490ac573 upstream.
As part of commit 463454b5dbd8 ("cfg80211: fix interface
combinations check"), this extra check was introduced:
if ((all_iftypes & used_iftypes) != used_iftypes)
goto cont;
However, most wireless NIC drivers did not advertise ADHOC in
wiphy.iface_combinations[i].limits[] and hence we'll get -EBUSY
when we bring up a ADHOC wlan with commands similar to:
# iwconfig wlan0 mode ad-hoc && ifconfig wlan0 up
In commit 8e8b41f9d8c8e ("cfg80211: enforce lack of interface
combinations"), the change below fixes the issue:
if (total == 1)
return 0;
But it also introduces other dependencies for stable. For example,
a full cherry pick of 8e8b41f9d8c8e would introduce additional
regressions unless we also start cherry picking driver specific
fixes like the following:
9b4760e ath5k: add possible wiphy interface combinations
1ae2fc2 mac80211_hwsim: advertise interface combinations
20c8e8d ath9k: add possible wiphy interface combinations
And the purpose of the 'if (total == 1)' is to cover the specific
use case (IBSS, adhoc) that was mentioned above. So we just pick
the specific part out from 8e8b41f9d8c8e here.
Doing so gives stable kernels a way to fix the change introduced
by 463454b5dbd8, without having to make cherry picks specific to
various NIC drivers.
Signed-off-by: Liang Li <liang.li@xxxxxxxxxxxxx>
Signed-off-by: Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/wireless/util.c | 3 +++
1 file changed, 3 insertions(+)
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -975,6 +975,9 @@ int cfg80211_can_change_interface(struct
}
mutex_unlock(&rdev->devlist_mtx);
+ if (total == 1)
+ return 0;
+
for (i = 0; i < rdev->wiphy.n_iface_combinations; i++) {
const struct ieee80211_iface_combination *c;
struct ieee80211_iface_limit *limits;
Patches currently in stable-queue which might be from paul.gortmaker@xxxxxxxxxxxxx are
queue-3.0/mm-mmu_notifier-fix-freed-page-still-mapped-in-secondary-mmu.patch
queue-3.0/cfg80211-fix-interface-combinations-check-for-adhoc-ibss.patch
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