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From:   <quic_haric@quicinc.com>
To:     <johannes@sipsolutions.net>
CC:     <linux-wireless@vger.kernel.org>,
        Hari Chandrakanthan <quic_haric@quicinc.com>
Subject: [PATCH] mac80211 : allow bw change during channel switch in mesh
Date:   Wed, 27 Jul 2022 12:02:29 +0530
Message-ID: <1658903549-21218-1-git-send-email-quic_haric@quicinc.com>
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From: Hari Chandrakanthan <quic_haric@quicinc.com>

From 'IEEE Std 802.11-2020 section 11.8.8.4.1' :
The mesh channel switch may be triggered by the need to avoid
interference to a detected radar signal, or to reassign mesh STA
channels to ensure the MBSS connectivity.
A 20/40 MHz MBSS may be changed to a 20 MHz MBSS and a 20 MHz MBSS may be
changed to a 20/40 MHz MBSS.

Since the standard allows the change of bandwidth during
the channel switch in mesh, remove the bandwidth check present in
ieee80211_set_csa_beacon.

Fixes: c6da674aff94 ("{nl,cfg,mac}80211: enable the triggering of CSA frame in mesh")
Signed-off-by: Hari Chandrakanthan <quic_haric@quicinc.com>
---
 net/mac80211/cfg.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index fe6500b..5db2cba 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -3598,9 +3598,6 @@ static int ieee80211_set_csa_beacon(struct ieee80211_sub_if_data *sdata,
 	case NL80211_IFTYPE_MESH_POINT: {
 		struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 
-		if (params->chandef.width != sdata->vif.bss_conf.chandef.width)
-			return -EINVAL;
-
 		/* changes into another band are not supported */
 		if (sdata->vif.bss_conf.chandef.chan->band !=
 		    params->chandef.chan->band)
-- 
2.7.4