From patchwork Mon Aug 28 11:59:28 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johannes Berg X-Patchwork-Id: 718200 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 357F2C83F1B for ; Mon, 28 Aug 2023 12:06:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232607AbjH1MFr (ORCPT ); Mon, 28 Aug 2023 08:05:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45304 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231602AbjH1MFW (ORCPT ); Mon, 28 Aug 2023 08:05:22 -0400 Received: from sipsolutions.net (s3.sipsolutions.net [IPv6:2a01:4f8:242:246e::2]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AE31911A for ; Mon, 28 Aug 2023 05:05:19 -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: Message-ID:Date:Subject:To:From:Content-Type:Sender:Reply-To:Cc:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-To:Resent-Cc: Resent-Message-ID:In-Reply-To:References; bh=3IM/xQxCNmMb+roBoyf++Go/ZcPS4Yk17bmSlUeSEJw=; t=1693224319; x=1694433919; b=tN8QFIh9CSARwlbuuh7gvMfHsJHi3TFsPREzwmtQdcomkuDMrxPFsiu6gqjnQdA62xIW1enZOSx P6mAp5eObeI5X2tjM/W+SMraaxhMkL6bbGBfI96lECGeKkyqW1i1fYXMrAJ6YNyUqn1w2sRWpz9js DdyV9mmuiVF7f5Ph930R9LWOwBBUvrsjyTNnSgYZYUTJyDUdbJ0oxHIfLKx/187/pgS3zqcmqzzd+ ScSSBi6AEL7/NoJdId7AQtArA1rO1y1QvT0OUMZXjzyKGC8dKla7cBDEXhHlD7h/Lw9zoG6ZV6FAD IQ0p1yvHFi+RYf+SnL3WrerE2s6QLX1uuQlw==; Received: by sipsolutions.net with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.96) (envelope-from ) id 1qaazd-00Gjgt-23 for linux-wireless@vger.kernel.org; Mon, 28 Aug 2023 14:05:17 +0200 From: Johannes Berg To: linux-wireless@vger.kernel.org Subject: [PATCH 00/40] wifi: cfg80211/mac80211: locking cleanups Date: Mon, 28 Aug 2023 13:59:28 +0200 Message-ID: <20230828115927.116700-41-johannes@sipsolutions.net> X-Mailer: git-send-email 2.41.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Hi, So ... I mentioned a few months ago this was the direction I was going in, and now here I have it. We've been running with it for a while, and it looks good. There's a kind of pointless commit in there that adds some wiphy locking assertions to the wdev as an intermediate step, I can remove that if you think that's better. We ran with it at that intermediate stage for a while to test things. As you can see in the list of patches, mutexes are removed: * in mac80211: sta_mtx, key_mtx, chanctx_mtx, ampdu_mlme.mtx, local->mtx, and iflist_mtx is reduced to just a driver helper mutex basically * in cfg80211, and was used by mac80211, the wdev mutex This also fixes a number of potential deadlocks lockdep would report in multi-link scenarios, but generally of course radically simplifies locking, no more worries about dependencies between the different mutexes in mac80211, etc. johannes