From patchwork Wed Oct 5 13:00:38 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johannes Berg X-Patchwork-Id: 612823 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 A7929C4332F for ; Wed, 5 Oct 2022 13:01:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230096AbiJENBY (ORCPT ); Wed, 5 Oct 2022 09:01:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41842 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230078AbiJENA6 (ORCPT ); Wed, 5 Oct 2022 09:00:58 -0400 Received: from sipsolutions.net (s3.sipsolutions.net [IPv6:2a01:4f8:191:4433::2]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E609E2CDDE for ; Wed, 5 Oct 2022 06:00:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sipsolutions.net; s=mail; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Content-Type:Sender :Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-To: Resent-Cc:Resent-Message-ID; bh=9VSh7S6ZvvOM6di/mKAqKw0yp+jDdDCZUlSwTNXpD30=; t=1664974857; x=1666184457; b=NdltjU8zOYRXcAHcdiIYqEOeqf3/OtyzZwPVlrVflItOvXS NVvGJMAlyPf0K4IrwPNDpYOtzArFbULy1e8jKJoODBIpabBU6ymkocw00aWwNQHi+AkgPQ7jEWAY6 9feWCLFUcNmf9rHSdBLqqn+4QY1pffz0xSbFmtYqH/euZ2jP/mOK8ZZ0xbu7bRnbDBflbDQGSVJQz 7vvlVGHQHXJdEnoTEkHWLhLtmzFTfZeQDxL+70sa8G4w+DQjFYJipP4E7zZXXSmCjb4gTnl68CAtM Sd6kdcmVJgwdXkVFbqk0/2+S61MgngiSiWqLXz05fs9Q3bZU/k9PRHHjl4kdUEgg==; Received: by sipsolutions.net with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.96) (envelope-from ) id 1og419-00G2RL-0H; Wed, 05 Oct 2022 15:00:55 +0200 From: Johannes Berg To: linux-wireless@vger.kernel.org Cc: Johannes Berg Subject: [PATCH 18/28] wifi: mac80211: add RCU _check() link access variants Date: Wed, 5 Oct 2022 15:00:38 +0200 Message-Id: <20221005145226.be2d0a5f0c99.I6d4abf13505122fca79578bb9da9473214602f13@changeid> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20221005130048.217341-1-johannes@sipsolutions.net> References: <20221005130048.217341-1-johannes@sipsolutions.net> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Johannes Berg We might sometimes need to use RCU and locking in the same code path, so add the two variants link_conf_dereference_check() and link_sta_dereference_check(). Signed-off-by: Johannes Berg --- include/net/mac80211.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/include/net/mac80211.h b/include/net/mac80211.h index c413050ec8dd..cda4584dfd51 100644 --- a/include/net/mac80211.h +++ b/include/net/mac80211.h @@ -1915,6 +1915,10 @@ static inline bool lockdep_vif_mutex_held(struct ieee80211_vif *vif) rcu_dereference_protected((vif)->link_conf[link_id], \ lockdep_vif_mutex_held(vif)) +#define link_conf_dereference_check(vif, link_id) \ + rcu_dereference_check((vif)->link_conf[link_id], \ + lockdep_vif_mutex_held(vif)) + /** * enum ieee80211_key_flags - key flags * @@ -2311,6 +2315,10 @@ static inline bool lockdep_sta_mutex_held(struct ieee80211_sta *pubsta) rcu_dereference_protected((sta)->link[link_id], \ lockdep_sta_mutex_held(sta)) +#define link_sta_dereference_check(sta, link_id) \ + rcu_dereference_check((sta)->link[link_id], \ + lockdep_sta_mutex_held(sta)) + #define for_each_sta_active_link(vif, sta, link_sta, link_id) \ for (link_id = 0; link_id < ARRAY_SIZE((sta)->link); link_id++) \ if ((!(vif)->active_links || \