linux-kernel - [PATCH 5.4 020/232] cfg80211: Do not warn on same channel at the end of CSA

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Message-Id: <20200416131318.869848120@linuxfoundation.org>
Date:   Thu, 16 Apr 2020 15:21:54 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ilan Peer <ilan.peer@...el.com>,
        Luca Coelho <luciano.coelho@...el.com>,
        Johannes Berg <johannes.berg@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 020/232] cfg80211: Do not warn on same channel at the end of CSA

From: Ilan Peer <ilan.peer@...el.com>

[ Upstream commit 05dcb8bb258575a8dd3499d0d78bd2db633c2b23 ]

When cfg80211_update_assoc_bss_entry() is called, there is a
verification that the BSS channel actually changed. As some APs use
CSA also for bandwidth changes, this would result with a kernel
warning.

Fix this by removing the WARN_ON().

Signed-off-by: Ilan Peer <ilan.peer@...el.com>
Signed-off-by: Luca Coelho <luciano.coelho@...el.com>
Link: https://lore.kernel.org/r/iwlwifi.20200326150855.96316ada0e8d.I6710376b1b4257e5f4712fc7ab16e2b638d512aa@changeid
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/wireless/scan.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index aef240fdf8df6..328402ab64a3f 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -2022,7 +2022,11 @@ void cfg80211_update_assoc_bss_entry(struct wireless_dev *wdev,
 
 	spin_lock_bh(&rdev->bss_lock);
 
-	if (WARN_ON(cbss->pub.channel == chan))
+	/*
+	 * Some APs use CSA also for bandwidth changes, i.e., without actually
+	 * changing the control channel, so no need to update in such a case.
+	 */
+	if (cbss->pub.channel == chan)
 		goto done;
 
 	/* use transmitting bss */
-- 
2.20.1