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=-13.8 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,URIBL_BLOCKED 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 49930C433E9 for ; Wed, 10 Feb 2021 08:28:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 269DE64E42 for ; Wed, 10 Feb 2021 08:28:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230317AbhBJI1g (ORCPT ); Wed, 10 Feb 2021 03:27:36 -0500 Received: from so15.mailgun.net ([198.61.254.15]:52837 "EHLO so15.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231394AbhBJI0d (ORCPT ); Wed, 10 Feb 2021 03:26:33 -0500 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1612945567; h=Content-Type: MIME-Version: Message-ID: In-Reply-To: Date: References: Subject: Cc: To: From: Sender; bh=9EoJ98RLCOjfNGA9m9IWMD0BBEcL08tR1uiW4fkuRXk=; b=LIeuY0QF0X+fPFbeEfsY1+Y4O+OvkOnd+NDiEbZzREibbHD96ucgyrUjNkgeqPcUzR6Mx1L2 a++hy/2VQ1BkLs/Qs0opAlQQ78hnCUZSRKpiYOMv1UC2MPneu5GHvb+rkOlAcXaFhJdO1TP6 8YmbLmk1lUZ/FBk8hpyB5P9ceGI= X-Mailgun-Sending-Ip: 198.61.254.15 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-n04.prod.us-west-2.postgun.com with SMTP id 6023988434db06ef79edb786 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Wed, 10 Feb 2021 08:25:40 GMT Sender: kvalo=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 035F8C433ED; Wed, 10 Feb 2021 08:25:39 +0000 (UTC) Received: from potku.adurom.net (88-114-240-156.elisa-laajakaista.fi [88.114.240.156]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: kvalo) by smtp.codeaurora.org (Postfix) with ESMTPSA id 4F74CC433ED; Wed, 10 Feb 2021 08:25:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 4F74CC433ED 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=kvalo@codeaurora.org From: Kalle Valo To: Shuah Khan Cc: davem@davemloft.net, kuba@kernel.org, netdev@vger.kernel.org, linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, ath10k@lists.infradead.org Subject: Re: [PATCH 4/5] ath10k: detect conf_mutex held ath10k_drain_tx() calls References: Date: Wed, 10 Feb 2021 10:25:35 +0200 In-Reply-To: (Shuah Khan's message of "Tue, 9 Feb 2021 17:42:25 -0700") Message-ID: <87lfbwtjls.fsf@codeaurora.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Shuah Khan writes: > ath10k_drain_tx() must not be called with conf_mutex held as workers can > use that also. Add check to detect conf_mutex held calls. > > Signed-off-by: Shuah Khan The commit log does not answer to "Why?". How did you find this? What actual problem are you trying to solve? > --- > drivers/net/wireless/ath/ath10k/mac.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c > index 53f92945006f..3545ce7dce0a 100644 > --- a/drivers/net/wireless/ath/ath10k/mac.c > +++ b/drivers/net/wireless/ath/ath10k/mac.c > @@ -4566,6 +4566,7 @@ static void ath10k_mac_op_wake_tx_queue(struct ieee80211_hw *hw, > /* Must not be called with conf_mutex held as workers can use that also. */ > void ath10k_drain_tx(struct ath10k *ar) > { > + WARN_ON(lockdep_is_held(&ar->conf_mutex)); Empty line after WARN_ON(). Shouldn't this check debug_locks similarly lockdep_assert_held() does? #define lockdep_assert_held(l) do { \ WARN_ON(debug_locks && !lockdep_is_held(l)); \ } while (0) And I suspect you need #ifdef CONFIG_LOCKDEP which should fix the kbuild bot error. But honestly I would prefer to have lockdep_assert_not_held() in include/linux/lockdep.h, much cleaner that way. Also i915_gem_object_lookup_rcu() could then use the same macro. -- https://patchwork.kernel.org/project/linux-wireless/list/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches