From patchwork Mon Apr 26 19:05:34 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aloka Dixit X-Patchwork-Id: 427708 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, 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 AAC6EC43460 for ; Mon, 26 Apr 2021 19:05:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 718C261078 for ; Mon, 26 Apr 2021 19:05:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233483AbhDZTG3 (ORCPT ); Mon, 26 Apr 2021 15:06:29 -0400 Received: from m43-7.mailgun.net ([69.72.43.7]:35783 "EHLO m43-7.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233464AbhDZTG2 (ORCPT ); Mon, 26 Apr 2021 15:06:28 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1619463946; h=Content-Transfer-Encoding: MIME-Version: References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=iPDSFuKc5Tfrz/NQSjCNOIONCtgxmE1s+TK9MwRkbVQ=; b=Zke5sElamF1BWIr8d5LuyMlnzu2+ENngimpsEkDvUd2AaY3FlnwkIcZG60MLVbpS7qIrlkaV 2eoJ0XlT0PId7R51tDvZNmF2Cd57ANApyy5bDIWtdXOuUWjx90NyVgHvmPO8AoilDf10jxpa Plo8WGGtF+LrA0W57mxuDjlorMs= X-Mailgun-Sending-Ip: 69.72.43.7 X-Mailgun-Sid: WyI3YTAwOSIsICJsaW51eC13aXJlbGVzc0B2Z2VyLmtlcm5lbC5vcmciLCAiYmU5ZTRhIl0= Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n01.prod.us-west-2.postgun.com with SMTP id 60870f0af34440a9d4a2d6d4 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Mon, 26 Apr 2021 19:05:46 GMT Sender: alokad=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 4CAFEC43144; Mon, 26 Apr 2021 19:05:46 +0000 (UTC) Received: from alokad-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: alokad) by smtp.codeaurora.org (Postfix) with ESMTPSA id E8EF6C433D3; Mon, 26 Apr 2021 19:05:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org E8EF6C433D3 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=alokad@codeaurora.org From: Aloka Dixit To: johannes@sipsolutions.net Cc: linux-wireless@vger.kernel.org, John Crispin , Aloka Dixit Subject: [PATCH v10 4/4] mac80211: CSA on non-transmitting interfaces Date: Mon, 26 Apr 2021 12:05:34 -0700 Message-Id: <20210426190534.12667-5-alokad@codeaurora.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210426190534.12667-1-alokad@codeaurora.org> References: <20210426190534.12667-1-alokad@codeaurora.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: John Crispin Trigger ieee80211_csa_finish() on the non-transmitting interfaces when channel switch concludes on the transmitting interface. The mutex wiphy->mtx is released before locking sdata->local->iflist_mtx to avoid deadlock with any other code path which may be using the same mutexes in opposite order. Signed-off-by: John Crispin Co-developed-by: Aloka Dixit Signed-off-by: Aloka Dixit --- v10: Used iflist_mtx instead of rcu_read_lock() as most other accesses to sdata->local->interfaces do so. net/mac80211/cfg.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c index db21e1a621b1..5ca75a23d54c 100644 --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -3254,8 +3254,21 @@ void ieee80211_csa_finish(struct ieee80211_vif *vif) { struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); - ieee80211_queue_work(&sdata->local->hw, - &sdata->csa_finalize_work); + if (sdata->vif.mbssid.flags & IEEE80211_VIF_MBSSID_TX) { + struct ieee80211_sub_if_data *child; + + wiphy_unlock(sdata->local->hw.wiphy); + mutex_lock(&sdata->local->iflist_mtx); + list_for_each_entry(child, &sdata->local->interfaces, list) + if (child->vif.mbssid.parent == vif && + ieee80211_sdata_running(child)) + ieee80211_queue_work(&child->local->hw, + &child->csa_finalize_work); + mutex_unlock(&sdata->local->iflist_mtx); + wiphy_lock(sdata->local->hw.wiphy); + } + + ieee80211_queue_work(&sdata->local->hw, &sdata->csa_finalize_work); } EXPORT_SYMBOL(ieee80211_csa_finish);