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[24.9.64.241]) by smtp.gmail.com with ESMTPSA id w16sm5228805ilh.35.2021.02.26.16.07.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 26 Feb 2021 16:07:02 -0800 (PST) From: Shuah Khan To: peterz@infradead.org, mingo@redhat.com, will@kernel.org, kvalo@codeaurora.org, davem@davemloft.net, kuba@kernel.org Subject: [PATCH v3 0/3] Add lockdep_assert_not_held() Date: Fri, 26 Feb 2021 17:06:57 -0700 Message-Id: X-Mailer: git-send-email 2.27.0 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210226_190706_134264_0540F683 X-CRM114-Status: GOOD ( 15.24 ) X-BeenThere: ath10k@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: netdev@vger.kernel.org, linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, ath10k@lists.infradead.org, Shuah Khan Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "ath10k" Errors-To: ath10k-bounces+ath10k=archiver.kernel.org@lists.infradead.org Some kernel functions must not be called holding a specific lock. Doing so could lead to locking problems. Currently these routines call lock_is_held() to check for lock hold followed by WARN_ON. Adding a common lockdep interface will help reduce the duplication of this logic in the rest of the kernel. Add lockdep_assert_not_held() to be used in these functions to detect incorrect calls while holding a lock. lockdep_assert_not_held() provides the opposite functionality of lockdep_assert_held() which is used to assert calls that require holding a specific lock. The need for lockdep_assert_not_held() came up in a discussion on ath10k patch. ath10k_drain_tx() and i915_vma_pin_ww() are examples of functions that can use lockdep_assert_not_held(). Link: https://lore.kernel.org/lkml/37a29c383bff2fb1605241ee6c7c9be3784fb3c6.1613171185.git.skhan@linuxfoundation.org/ Link: https://lore.kernel.org/linux-wireless/871rdmu9z9.fsf@codeaurora.org/ This patch series adds lockdep_assert_not_held() and uses it in the second patch in ath10k_drain_tx() function. Changes since v2: -- Fixed coding style issues -- Patch 2 uses new lock states in __lock_is_held() and lock_is_held_type Patch 1 incorporates suggestions from Peter Zijlstra on v1 series to avoid misfires when lockdep_off() is employed. Patch 2 Johannes Berg's suggestions as it make it easier to read and maintain the lock states. These are defines and a enum to avoid changes to lock_is_held_type() and lockdep_is_held() return types. Patch 2 is a separate patch because it adds defines to lockdep.h and kernel/locking/lockdep.c now includes lockdep.h - decided make this a separate patch just in case issues related to header dependencies pop up. I can combine Patches 1&2 if that is preferred. Patch 3 uses the new interface in ath10k_drain_tx() function. Added Kalle Valo's Ack from v1 for this change. Tested on the mainline from yesterday. Shuah Khan (3): lockdep: add lockdep_assert_not_held() lockdep: add lockdep lock state defines ath10k: detect conf_mutex held ath10k_drain_tx() calls drivers/net/wireless/ath/ath10k/mac.c | 2 ++ include/linux/lockdep.h | 18 +++++++++++++++--- kernel/locking/lockdep.c | 15 ++++++++++----- 3 files changed, 27 insertions(+), 8 deletions(-) -- 2.27.0 _______________________________________________ ath10k mailing list ath10k@lists.infradead.org http://lists.infradead.org/mailman/listinfo/ath10k 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,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 BECC1C433E0 for ; Sat, 27 Feb 2021 00:07:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8C93B64F13 for ; Sat, 27 Feb 2021 00:07:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229864AbhB0AHo (ORCPT ); Fri, 26 Feb 2021 19:07:44 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34220 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229618AbhB0AHn (ORCPT ); Fri, 26 Feb 2021 19:07:43 -0500 Received: from mail-il1-x133.google.com (mail-il1-x133.google.com [IPv6:2607:f8b0:4864:20::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9899EC061756 for ; Fri, 26 Feb 2021 16:07:03 -0800 (PST) Received: by mail-il1-x133.google.com with SMTP id q5so9532347ilc.10 for ; Fri, 26 Feb 2021 16:07:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=OSmlNKAH65bzlnQXsk21f+18mG93Ep8ybFIZEp9s10U=; b=Zb2vsPMYmiEqTdjWpz46Iy4Guw0uZfsmTR8lWFEGzTskhLkQtwu7rX8BTJ61kA9XZP 4P/tjGg6FpU88o3v9O6XvZrGDP4NtyxelZCvZ9Eu98a9eXgj/MY0A+4uAodEbKaA+cWJ po9s6C9FB1Vr+WYeAzAbOnsyinTTfofwEpQag= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=OSmlNKAH65bzlnQXsk21f+18mG93Ep8ybFIZEp9s10U=; b=WviOi52o966TV16xNjnQEbm8jKBuKgYEcsRAOh1m/Gpzi47ybYsvfC+0trRk1jZWMS UD9oDHry0kQxnVf4cJsx4LiDVj7Lg5HJcnKng1ttNW+gW73d4DcOt73aGkA8tcbOxgOU IfYEay4CZx2N5t6/lfHodxL30ORYEp1FZwuAAurrca43zXtzWcan1rgWUlFNH8TvLxLh XtC5OjLBSQNK95E23xmwJsdCVmuEiu1iwuVqYsyGw3lSBC4YsPb18WnOqLuo+VIKlIA5 uj1iGUOnBVml3GHNLNFkjeeNDm2g6lzX3H5OUCsVmIuwbPlsXPzVVlL9th8VDsbS077j wvyA== X-Gm-Message-State: AOAM5324890b9RhNYLP0wXKwtKJwU4wtwZ3hpnZzKL9GpGCPapDN8Iug JA8PbZ+4jeC+2hbKN8Ah85b0Rw== X-Google-Smtp-Source: ABdhPJweVmTRywkMYBz2Qghux6InHjNKdPGIkkwPvC9/BRfhxBjqwSHM4Pnp6/Rz/easnQEPe+Li/w== X-Received: by 2002:a92:4412:: with SMTP id r18mr4455803ila.170.1614384422849; Fri, 26 Feb 2021 16:07:02 -0800 (PST) Received: from shuah-t480s.internal (c-24-9-64-241.hsd1.co.comcast.net. [24.9.64.241]) by smtp.gmail.com with ESMTPSA id w16sm5228805ilh.35.2021.02.26.16.07.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 26 Feb 2021 16:07:02 -0800 (PST) From: Shuah Khan To: peterz@infradead.org, mingo@redhat.com, will@kernel.org, kvalo@codeaurora.org, davem@davemloft.net, kuba@kernel.org Cc: Shuah Khan , ath10k@lists.infradead.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 0/3] Add lockdep_assert_not_held() Date: Fri, 26 Feb 2021 17:06:57 -0700 Message-Id: X-Mailer: git-send-email 2.27.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Some kernel functions must not be called holding a specific lock. Doing so could lead to locking problems. Currently these routines call lock_is_held() to check for lock hold followed by WARN_ON. Adding a common lockdep interface will help reduce the duplication of this logic in the rest of the kernel. Add lockdep_assert_not_held() to be used in these functions to detect incorrect calls while holding a lock. lockdep_assert_not_held() provides the opposite functionality of lockdep_assert_held() which is used to assert calls that require holding a specific lock. The need for lockdep_assert_not_held() came up in a discussion on ath10k patch. ath10k_drain_tx() and i915_vma_pin_ww() are examples of functions that can use lockdep_assert_not_held(). Link: https://lore.kernel.org/lkml/37a29c383bff2fb1605241ee6c7c9be3784fb3c6.1613171185.git.skhan@linuxfoundation.org/ Link: https://lore.kernel.org/linux-wireless/871rdmu9z9.fsf@codeaurora.org/ This patch series adds lockdep_assert_not_held() and uses it in the second patch in ath10k_drain_tx() function. Changes since v2: -- Fixed coding style issues -- Patch 2 uses new lock states in __lock_is_held() and lock_is_held_type Patch 1 incorporates suggestions from Peter Zijlstra on v1 series to avoid misfires when lockdep_off() is employed. Patch 2 Johannes Berg's suggestions as it make it easier to read and maintain the lock states. These are defines and a enum to avoid changes to lock_is_held_type() and lockdep_is_held() return types. Patch 2 is a separate patch because it adds defines to lockdep.h and kernel/locking/lockdep.c now includes lockdep.h - decided make this a separate patch just in case issues related to header dependencies pop up. I can combine Patches 1&2 if that is preferred. Patch 3 uses the new interface in ath10k_drain_tx() function. Added Kalle Valo's Ack from v1 for this change. Tested on the mainline from yesterday. Shuah Khan (3): lockdep: add lockdep_assert_not_held() lockdep: add lockdep lock state defines ath10k: detect conf_mutex held ath10k_drain_tx() calls drivers/net/wireless/ath/ath10k/mac.c | 2 ++ include/linux/lockdep.h | 18 +++++++++++++++--- kernel/locking/lockdep.c | 15 ++++++++++----- 3 files changed, 27 insertions(+), 8 deletions(-) -- 2.27.0