From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,T_DKIMWL_WL_HIGH,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 88F2DC072B1 for ; Thu, 30 May 2019 04:11:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5E87425182 for ; Thu, 30 May 2019 04:11:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559189514; bh=lfa6ubSAXCwwv7XGl9evmSVdGbNoD54IxTwiATEwgto=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=cPzqrIvux1t6CXABtiUPunoiEs13cB0sOCfhWzFZ63LKoHv4Z9nRRirAxKGFjEalM ae2l5egN3i34n8AD/1D099mWxsk2/fSXtvQYnUVd19GAoftTCGF9rBqqgjlBvlbHgK gV/z+PJqPXqsvU4AwVUA9NHadQhCq+VdqQAQMUWI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726350AbfE3ELw (ORCPT ); Thu, 30 May 2019 00:11:52 -0400 Received: from mail.kernel.org ([198.145.29.99]:43788 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729391AbfE3DQq (ORCPT ); Wed, 29 May 2019 23:16:46 -0400 Received: from localhost (ip67-88-213-2.z213-88-67.customer.algx.net [67.88.213.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 83A3F245C1; Thu, 30 May 2019 03:16:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559186205; bh=lfa6ubSAXCwwv7XGl9evmSVdGbNoD54IxTwiATEwgto=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rq21TnSsP3c43jgXnJHt6V/UcsULfeV3SWW8JOKKeoCQ8ZWaUlQSEG9H2W3Cl4bQ/ E3JiJKCpIwGL8FK7Gw1mBXpNKOm293czlhj6qZLhIqtJd778s13upThgP0rtc2og3r zzmwL/MTFQdyBiv80xWknCflxJbOKs9v1FWQ7G+E= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Sergey Matyukevich , Johannes Berg , Sasha Levin Subject: [PATCH 4.19 092/276] mac80211/cfg80211: update bss channel on channel switch Date: Wed, 29 May 2019 20:04:10 -0700 Message-Id: <20190530030531.952544540@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190530030523.133519668@linuxfoundation.org> References: <20190530030523.133519668@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org [ Upstream commit 5dc8cdce1d722c733f8c7af14c5fb595cfedbfa8 ] FullMAC STAs have no way to update bss channel after CSA channel switch completion. As a result, user-space tools may provide inconsistent channel info. For instance, consider the following two commands: $ sudo iw dev wlan0 link $ sudo iw dev wlan0 info The latter command gets channel info from the hardware, so most probably its output will be correct. However the former command gets channel info from scan cache, so its output will contain outdated channel info. In fact, current bss channel info will not be updated until the next [re-]connect. Note that mac80211 STAs have a workaround for this, but it requires access to internal cfg80211 data, see ieee80211_chswitch_work: /* XXX: shouldn't really modify cfg80211-owned data! */ ifmgd->associated->channel = sdata->csa_chandef.chan; This patch suggests to convert mac80211 workaround into cfg80211 behavior and to update current bss channel in cfg80211_ch_switch_notify. Signed-off-by: Sergey Matyukevich Signed-off-by: Johannes Berg Signed-off-by: Sasha Levin --- net/mac80211/mlme.c | 3 --- net/wireless/nl80211.c | 5 +++++ 2 files changed, 5 insertions(+), 3 deletions(-) diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index 3dbecae4be73c..2ac749c4a6b26 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -1156,9 +1156,6 @@ static void ieee80211_chswitch_work(struct work_struct *work) goto out; } - /* XXX: shouldn't really modify cfg80211-owned data! */ - ifmgd->associated->channel = sdata->csa_chandef.chan; - ifmgd->csa_waiting_bcn = true; ieee80211_sta_reset_beacon_monitor(sdata); diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index 048e004ed0ee8..c6711ead5e591 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -15441,6 +15441,11 @@ void cfg80211_ch_switch_notify(struct net_device *dev, wdev->chandef = *chandef; wdev->preset_chandef = *chandef; + + if (wdev->iftype == NL80211_IFTYPE_STATION && + !WARN_ON(!wdev->current_bss)) + wdev->current_bss->pub.channel = chandef->chan; + nl80211_ch_switch_notify(rdev, dev, chandef, GFP_KERNEL, NL80211_CMD_CH_SWITCH_NOTIFY, 0); } -- 2.20.1