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From:   Janusz Dziedzic <janusz.dziedzic@gmail.com>
To:     linux-wireless@vger.kernel.org
Cc:     johannes@sipsolutions.net,
        Janusz Dziedzic <janusz.dziedzic@gmail.com>
Subject: [PATCH] cfg80211: move bridge/4addr mode check
Date:   Sun, 24 Oct 2021 22:15:46 +0200
Message-Id: <20211024201546.614379-1-janusz.dziedzic@gmail.com>
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Without the patch we failed:

janusz@t2:~$ sudo brctl addbr br0
janusz@t2:~$ sudo brctl addif br0 wlp1s0
janusz@t2:~$ sudo iw wlp1s0 set 4addr on
command failed: Device or resource busy (-16)

Last command failed but iface was already in 4addr mode.

Signed-off-by: Janusz Dziedzic <janusz.dziedzic@gmail.com>
---
 net/wireless/util.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/net/wireless/util.c b/net/wireless/util.c
index 18dba3d7c638..c0c87541326f 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -1028,14 +1028,14 @@ int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 	    !(rdev->wiphy.interface_modes & (1 << ntype)))
 		return -EOPNOTSUPP;
 
-	/* if it's part of a bridge, reject changing type to station/ibss */
-	if (netif_is_bridge_port(dev) &&
-	    (ntype == NL80211_IFTYPE_ADHOC ||
-	     ntype == NL80211_IFTYPE_STATION ||
-	     ntype == NL80211_IFTYPE_P2P_CLIENT))
-		return -EBUSY;
-
 	if (ntype != otype) {
+		/* if it's part of a bridge, reject changing type to station/ibss */
+		if (netif_is_bridge_port(dev) &&
+		    (ntype == NL80211_IFTYPE_ADHOC ||
+		     ntype == NL80211_IFTYPE_STATION ||
+		     ntype == NL80211_IFTYPE_P2P_CLIENT))
+				return -EBUSY;
+
 		dev->ieee80211_ptr->use_4addr = false;
 		dev->ieee80211_ptr->mesh_id_up_len = 0;
 		wdev_lock(dev->ieee80211_ptr);
-- 
2.25.1