From patchwork Mon Jun 19 13:26:49 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Greenman, Gregory" X-Patchwork-Id: 13284511 X-Patchwork-Delegate: johannes@sipsolutions.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DBF5CEB64DB for ; Mon, 19 Jun 2023 13:27:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231921AbjFSN1S (ORCPT ); Mon, 19 Jun 2023 09:27:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34462 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231917AbjFSN1R (ORCPT ); Mon, 19 Jun 2023 09:27:17 -0400 Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 69FE619C for ; Mon, 19 Jun 2023 06:27:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1687181236; x=1718717236; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=AE+zYL1FUgAosGMm+jzMUM+rPYWAbQLeX2CiQjF/VA8=; b=Oam6R+Y43ItkpQJm78bsHNJkEllj9za3Eq6tmLzrYz0j+7v35pVkc6wM Hg7epWZwiThQ4fU6K4NTkOGmTNvnqhI5DUoDhx/V4dw18S3xhszZ/UJOg KpBNob9H1HTIR26WUlFxSP/iHn2LjfA1YynIp+1DL9s5CNGoLW7tWH/EN 4cQkxED96Z4Dzt68OJjfP+h0t4Wu2xsE2t1eOpU05im9MEJfZjYSHAF60 tP8vDpo9aEQmsCZWDLRMwaBHIPALUTiRe5NhHEWY51iepF9oFgkuvCL0U aKB6Drwv1Wcqc+/mvFJlu56sqVLmFFKHeABP0a2c3bbi2JGB75p0jX0pe A==; X-IronPort-AV: E=McAfee;i="6600,9927,10746"; a="339240683" X-IronPort-AV: E=Sophos;i="6.00,254,1681196400"; d="scan'208";a="339240683" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Jun 2023 06:27:16 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10746"; a="716871735" X-IronPort-AV: E=Sophos;i="6.00,254,1681196400"; d="scan'208";a="716871735" Received: from aadawii-mobl2.ger.corp.intel.com (HELO ggreenma-mobl2.lan) ([10.214.201.44]) by fmsmga007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Jun 2023 06:27:14 -0700 From: gregory.greenman@intel.com To: johannes@sipsolutions.net Cc: linux-wireless@vger.kernel.org, Johannes Berg , Gregory Greenman Subject: [PATCH 5/9] wifi: mac80211: always hold sdata lock in chanctx assign/unassign Date: Mon, 19 Jun 2023 16:26:49 +0300 Message-Id: <20230619161906.a5cf7534beda.I5b51664231abee27e02f222083df7ccf88722929@changeid> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20230619132653.902084-1-gregory.greenman@intel.com> References: <20230619132653.902084-1-gregory.greenman@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Johannes Berg Due to all the multi-link handling, we now expose the fact that the sdata/vif is locked to drivers, e.g. when the driver uses ieee80211_set_monitor_channel(). This was true when a chanctx is added to or removed from a link, _except_ in monitor mode with the virtual sdata/vif. Change that, so that drivers can make that assumption. Signed-off-by: Johannes Berg Signed-off-by: Gregory Greenman --- net/mac80211/cfg.c | 16 +++++++++++----- net/mac80211/iface.c | 7 +++++++ 2 files changed, 18 insertions(+), 5 deletions(-) diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c index eea7028a46a7..e7ac24603892 100644 --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -913,24 +913,30 @@ static int ieee80211_set_monitor_channel(struct wiphy *wiphy, if (cfg80211_chandef_identical(&local->monitor_chandef, chandef)) return 0; - mutex_lock(&local->mtx); if (local->use_chanctx) { sdata = wiphy_dereference(local->hw.wiphy, local->monitor_sdata); if (sdata) { + sdata_lock(sdata); + mutex_lock(&local->mtx); ieee80211_link_release_channel(&sdata->deflink); ret = ieee80211_link_use_channel(&sdata->deflink, chandef, IEEE80211_CHANCTX_EXCLUSIVE); + mutex_unlock(&local->mtx); + sdata_unlock(sdata); + } + } else { + mutex_lock(&local->mtx); + if (local->open_count == local->monitors) { + local->_oper_chandef = *chandef; + ieee80211_hw_config(local, 0); } - } else if (local->open_count == local->monitors) { - local->_oper_chandef = *chandef; - ieee80211_hw_config(local, 0); + mutex_unlock(&local->mtx); } if (ret == 0) local->monitor_chandef = *chandef; - mutex_unlock(&local->mtx); return ret; } diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c index 9518acf9643b..be586bc0b5b7 100644 --- a/net/mac80211/iface.c +++ b/net/mac80211/iface.c @@ -1133,6 +1133,7 @@ int ieee80211_add_virtual_monitor(struct ieee80211_local *local) snprintf(sdata->name, IFNAMSIZ, "%s-monitor", wiphy_name(local->hw.wiphy)); sdata->wdev.iftype = NL80211_IFTYPE_MONITOR; + mutex_init(&sdata->wdev.mtx); ieee80211_sdata_init(local, sdata); @@ -1157,16 +1158,19 @@ int ieee80211_add_virtual_monitor(struct ieee80211_local *local) rcu_assign_pointer(local->monitor_sdata, sdata); mutex_unlock(&local->iflist_mtx); + sdata_lock(sdata); mutex_lock(&local->mtx); ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chandef, IEEE80211_CHANCTX_EXCLUSIVE); mutex_unlock(&local->mtx); + sdata_unlock(sdata); if (ret) { mutex_lock(&local->iflist_mtx); RCU_INIT_POINTER(local->monitor_sdata, NULL); mutex_unlock(&local->iflist_mtx); synchronize_net(); drv_remove_interface(local, sdata); + mutex_destroy(&sdata->wdev.mtx); kfree(sdata); return ret; } @@ -1202,12 +1206,15 @@ void ieee80211_del_virtual_monitor(struct ieee80211_local *local) synchronize_net(); + sdata_lock(sdata); mutex_lock(&local->mtx); ieee80211_link_release_channel(&sdata->deflink); mutex_unlock(&local->mtx); + sdata_unlock(sdata); drv_remove_interface(local, sdata); + mutex_destroy(&sdata->wdev.mtx); kfree(sdata); }