From patchwork Fri Feb 26 17:52:13 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shuah Khan X-Patchwork-Id: 12107035 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=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,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 EC9C5C433E0 for ; Fri, 26 Feb 2021 17:53:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id ADDC360241 for ; Fri, 26 Feb 2021 17:53:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230260AbhBZRxZ (ORCPT ); Fri, 26 Feb 2021 12:53:25 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38682 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230144AbhBZRxA (ORCPT ); Fri, 26 Feb 2021 12:53:00 -0500 Received: from mail-il1-x12a.google.com (mail-il1-x12a.google.com [IPv6:2607:f8b0:4864:20::12a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 85E44C061786 for ; Fri, 26 Feb 2021 09:52:19 -0800 (PST) Received: by mail-il1-x12a.google.com with SMTP id g9so8748971ilc.3 for ; Fri, 26 Feb 2021 09:52:19 -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:in-reply-to:references :mime-version:content-transfer-encoding; bh=KzQ9OBQajFeaiUpGgz5pU1UyInmaQ1PIgYZOHvN7J2s=; b=QmEx6PMwk5EzxsrPZJ6iRfQ/ny2qMbBfnWObiy0RKj7IzCtCtGd2xn3nfRRPTWrMDn 8qODazbWCshriSjXgg2GqqfyIxkQxBwY1cmWSxb2GEk7YRApPYA3iYuVChku9DJatqOG Rg8jTRSgD/ztSQ1+1eAYv8ZZWPYSsXyi4jNH0= 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:in-reply-to :references:mime-version:content-transfer-encoding; bh=KzQ9OBQajFeaiUpGgz5pU1UyInmaQ1PIgYZOHvN7J2s=; b=fI7Z8p3KaYEvSzG3lRsn1a708fd1LWTItMZ1G64AQ9nM9ZOEcnfet05oy5cV9cD6HD x+Xyjf24a2MTD3H/v2Ej+xU8uKo2rPjhlYp5WOg5ZVIIeYIzirLegtc2nJg7NV08ix6P VtK5rFBL44tVoAGcMqgkEfQwIJ5AC5NDMRfrrtpJ9SBUEp1oJGFu1nqMyQHgh7EzCGsN Nc3SIGx6mofLb3oRq0JCM5tFa1Bj10NMAHmPEDkzDsG2cjybosXb9Ee2RRRj835D7Ilf XZX2WDVQuaSdbiYODR/rqiPHpdyDZKLZBBvsKpq03hcWf3tSr7KhW48UxtwxI54bwl+U VOdQ== X-Gm-Message-State: AOAM533XiAbkhETtzG2obj2mZFHOfmx63xHIGs7BSJqBDAK9FdkVvFz+ 4JB0c5DflIZTTuYHPDNrnOAJaA== X-Google-Smtp-Source: ABdhPJzKtNZ9DqshtlkVijD2KykbsioNqaOrCP1Wc05drU0Weq1Yrn5ll6pcxxXm1ey3JQd/0u87WQ== X-Received: by 2002:a92:cc49:: with SMTP id t9mr3302848ilq.86.1614361939062; Fri, 26 Feb 2021 09:52:19 -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 y25sm5594060ioa.5.2021.02.26.09.52.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 26 Feb 2021 09:52:18 -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 v2 1/3] lockdep: add lockdep_assert_not_held() Date: Fri, 26 Feb 2021 10:52:13 -0700 Message-Id: X-Mailer: git-send-email 2.27.0 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Some kernel functions must be called without holding a specific lock. 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. Incorporates suggestions from Peter Zijlstra to avoid misfires when lockdep_off() is employed. 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/ Signed-off-by: Shuah Khan --- include/linux/lockdep.h | 11 ++++++++--- kernel/locking/lockdep.c | 5 ++++- 2 files changed, 12 insertions(+), 4 deletions(-) diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index b9e9adec73e8..93eb5f797fc1 100644 --- a/include/linux/lockdep.h +++ b/include/linux/lockdep.h @@ -294,8 +294,12 @@ extern void lock_unpin_lock(struct lockdep_map *lock, struct pin_cookie); #define lockdep_depth(tsk) (debug_locks ? (tsk)->lockdep_depth : 0) -#define lockdep_assert_held(l) do { \ - WARN_ON(debug_locks && !lockdep_is_held(l)); \ +#define lockdep_assert_held(l) do { \ + WARN_ON(debug_locks && lockdep_is_held(l) == 0); \ + } while (0) + +#define lockdep_assert_not_held(l) do { \ + WARN_ON(debug_locks && lockdep_is_held(l) == 1); \ } while (0) #define lockdep_assert_held_write(l) do { \ @@ -384,7 +388,8 @@ extern int lockdep_is_held(const void *); #define lockdep_is_held_type(l, r) (1) #define lockdep_assert_held(l) do { (void)(l); } while (0) -#define lockdep_assert_held_write(l) do { (void)(l); } while (0) +#define lockdep_assert_not_held(l) do { (void)(l); } while (0) +#define lockdep_assert_held_write(l) do { (void)(l); } while (0) #define lockdep_assert_held_read(l) do { (void)(l); } while (0) #define lockdep_assert_held_once(l) do { (void)(l); } while (0) diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index bdaf4829098c..d3299fd85c4a 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -5472,7 +5472,10 @@ noinstr int lock_is_held_type(const struct lockdep_map *lock, int read) int ret = 0; if (unlikely(!lockdep_enabled())) - return 1; /* avoid false negative lockdep_assert_held() */ + /* avoid false negative lockdep_assert_not_held() + * and lockdep_assert_held() + */ + return -1; raw_local_irq_save(flags); check_flags(flags); From patchwork Fri Feb 26 17:52:14 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shuah Khan X-Patchwork-Id: 12107037 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=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,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 69140C433E0 for ; Fri, 26 Feb 2021 17:54:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3E24260241 for ; Fri, 26 Feb 2021 17:54:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230315AbhBZRyS (ORCPT ); Fri, 26 Feb 2021 12:54:18 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38838 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230281AbhBZRxm (ORCPT ); Fri, 26 Feb 2021 12:53:42 -0500 Received: from mail-io1-xd34.google.com (mail-io1-xd34.google.com [IPv6:2607:f8b0:4864:20::d34]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 54FE4C061793 for ; Fri, 26 Feb 2021 09:52:20 -0800 (PST) Received: by mail-io1-xd34.google.com with SMTP id z13so10484855iox.8 for ; Fri, 26 Feb 2021 09:52:20 -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:in-reply-to:references :mime-version:content-transfer-encoding; bh=RqKjcn5wYBxUDgGXla7FbQ8hvCQ5YPGkm8GvOW6PP/E=; b=RrvYZksgwaH67ZVRc4joOMms8r1OYTdoHXE2Z64g3k03EAqgOl+xfxRqrKdPLBQCqD 9P2X5LJ7P1FLl26oNrdT/SZLMRs6Hh5JvPTRVmAf7HUgxz86AiUCdMNoqnOFVwGSor8F CQ2EJ2L/4UWf7DYLmegiVtOIJSan8XDN++IWo= 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:in-reply-to :references:mime-version:content-transfer-encoding; bh=RqKjcn5wYBxUDgGXla7FbQ8hvCQ5YPGkm8GvOW6PP/E=; b=Mc1oVoSlxniDdkk5+j+8vAauDtxc6E9Y4yFOEPkiyiaEWi5FCOyblqiIgLt6SK2qjQ gTWZhTqYjeQ60urvl3E62XQ2TbviUz65E3cm0qit/NfjhIdnK50MUiUx4kNBqH8I1Zg3 AUwpmIbEouWtNPyYGDxuxtIaSJaaQXhgV88moY1CSXyQCw/4v+t/FcWWR4CzfxidO46u nasNedkYVXQBrr8LYaB/g1+ew19sJDea2NF8x4YjyScGvg160IftQSG8row+VyjUD+GD tSnwaICyJ/2uCLzBES2vhd3j/0c1Kx5RCZO0N0Km3lkmKeRYW93WNH9S4WawilNxhO/L bwrQ== X-Gm-Message-State: AOAM533cI1wnXgxS8DTxSRkcXWT/8/lbVNFLZvOSog7XN8lnYT6q+J5n liWdiL9m65g7OfWZAwlxTlQcrQ== X-Google-Smtp-Source: ABdhPJy91vIDGXJWk9N2yqhUo0q6PdFitbP4jcPN+5IeoXRVv4Hj7tj3DiojkGULgr5M10ZnMYY32w== X-Received: by 2002:a6b:b5c2:: with SMTP id e185mr3784589iof.204.1614361939843; Fri, 26 Feb 2021 09:52:19 -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 y25sm5594060ioa.5.2021.02.26.09.52.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 26 Feb 2021 09:52:19 -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 v2 2/3] lockdep: add lockdep lock state defines Date: Fri, 26 Feb 2021 10:52:14 -0700 Message-Id: X-Mailer: git-send-email 2.27.0 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Adds defines for lock state returns from lock_is_held_type() based on 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. Link: https://lore.kernel.org/lkml/37a29c383bff2fb1605241ee6c7c9be3784fb3c6.1613171185.git.skhan@linuxfoundation.org/ Link: https://lore.kernel.org/linux-wireless/871rdmu9z9.fsf@codeaurora.org/ Signed-off-by: Shuah Khan --- include/linux/lockdep.h | 11 +++++++++-- kernel/locking/lockdep.c | 3 ++- 2 files changed, 11 insertions(+), 3 deletions(-) diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index 93eb5f797fc1..7c2622854152 100644 --- a/include/linux/lockdep.h +++ b/include/linux/lockdep.h @@ -261,6 +261,11 @@ extern void lock_acquire(struct lockdep_map *lock, unsigned int subclass, extern void lock_release(struct lockdep_map *lock, unsigned long ip); +/* lock_is_held_type() returns */ +#define LOCK_STATE_UNKNOWN -1 +#define LOCK_STATE_NOT_HELD 0 +#define LOCK_STATE_HELD 1 + /* * Same "read" as for lock_acquire(), except -1 means any. */ @@ -295,11 +300,13 @@ extern void lock_unpin_lock(struct lockdep_map *lock, struct pin_cookie); #define lockdep_depth(tsk) (debug_locks ? (tsk)->lockdep_depth : 0) #define lockdep_assert_held(l) do { \ - WARN_ON(debug_locks && lockdep_is_held(l) == 0); \ + WARN_ON(debug_locks && \ + lockdep_is_held(l) == LOCK_STATE_NOT_HELD); \ } while (0) #define lockdep_assert_not_held(l) do { \ - WARN_ON(debug_locks && lockdep_is_held(l) == 1); \ + WARN_ON(debug_locks && \ + lockdep_is_held(l) == LOCK_STATE_HELD); \ } while (0) #define lockdep_assert_held_write(l) do { \ diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index d3299fd85c4a..e3898c888ad2 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -54,6 +54,7 @@ #include #include #include +#include #include @@ -5475,7 +5476,7 @@ noinstr int lock_is_held_type(const struct lockdep_map *lock, int read) /* avoid false negative lockdep_assert_not_held() * and lockdep_assert_held() */ - return -1; + return LOCK_STATE_UNKNOWN; raw_local_irq_save(flags); check_flags(flags); From patchwork Fri Feb 26 17:52:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shuah Khan X-Patchwork-Id: 12107039 X-Patchwork-Delegate: kuba@kernel.org 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=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,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 9FAA7C433E6 for ; Fri, 26 Feb 2021 17:54:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6FE2A64F27 for ; Fri, 26 Feb 2021 17:54:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230206AbhBZRyh (ORCPT ); Fri, 26 Feb 2021 12:54:37 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38852 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230296AbhBZRxp (ORCPT ); Fri, 26 Feb 2021 12:53:45 -0500 Received: from mail-io1-xd2e.google.com (mail-io1-xd2e.google.com [IPv6:2607:f8b0:4864:20::d2e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3D904C0617A7 for ; Fri, 26 Feb 2021 09:52:21 -0800 (PST) Received: by mail-io1-xd2e.google.com with SMTP id u20so10485332iot.9 for ; Fri, 26 Feb 2021 09:52:21 -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:in-reply-to:references :mime-version:content-transfer-encoding; bh=yytI7x7nMwQqYfkH8zJk8MWsbajZm7+7KB4c/JWojUI=; b=AFIgbIR9M1LUoj6H3z378i+R7QUdBO3CwFoWO44Dx08yOT0wGXel220fIR+hJZ9bC5 qhTaPNWmINhWlJDPNGmD3tn2Dy+m2DB4wl7DnYLCKPjmGJBk4X+F7WdaV00KhPSZeVOW 4OXK8iZYoHlSc9Z+QLSm0BfI+yujpjqT4QNJU= 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:in-reply-to :references:mime-version:content-transfer-encoding; bh=yytI7x7nMwQqYfkH8zJk8MWsbajZm7+7KB4c/JWojUI=; b=bBOgwV/gsZPOUEsV0Y8l93yEnYNJs0OmajgXBjkFSdbQQZGJ1YSSwtdv3glSUOQzbz hYEGwcbcxxI0HhRGLwOERc5ZfDvBQootnW+bP/VNTOQ0MpFzB1spKVHdgL4RVeQCaLTI 9PHCawSKiWhRVlOjqLYWESq0FvHfquF5ITBVI8oB2GhRvmCcW2V8+M+0i68ULB+3lVf9 vAYM9nn4AoBpHVUi4Yic64notjVAhzUlZNt4chiRQ15Bs0vQKh0u9Nniop1qhqbnt1I7 lgo65RIAQ4oxCKz4plzvw0k1sYpF7FITugke6i4mJr1CfRg5TPwrZpMP3srBbn3TK4PP UFMA== X-Gm-Message-State: AOAM530iXqmIAj3mb2Go0Qb8G8bjWtUxsLima8hwomor0VKQVPWV9JfB 8/RwqS/XCGzfEJKAmCcauKgBug== X-Google-Smtp-Source: ABdhPJzDvP35cqoe+MlNhyNJMg/N0vt8re7YhfzdHlkeva41movmV4gDLh1tDN7Jsfz/AJTW9RmZeA== X-Received: by 2002:a5e:8f0a:: with SMTP id c10mr3842450iok.192.1614361940631; Fri, 26 Feb 2021 09:52:20 -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 y25sm5594060ioa.5.2021.02.26.09.52.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 26 Feb 2021 09:52:20 -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 v2 3/3] ath10k: detect conf_mutex held ath10k_drain_tx() calls Date: Fri, 26 Feb 2021 10:52:15 -0700 Message-Id: <38eef822d97917db50068eb65eb71ae3b83eb43e.1614355914.git.skhan@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org ath10k_drain_tx() must not be called with conf_mutex held as workers can use that also. Add call to lockdep_assert_not_held() on conf_mutex to detect if conf_mutex is held by the caller. The idea for this patch stemmed from coming across the comment block above the ath10k_drain_tx() while reviewing the conf_mutex holds during to debug the conf_mutex lock assert in ath10k_debug_fw_stats_request(). Adding detection to assert on conf_mutex hold will help detect incorrect usages that could lead to locking problems when async worker routines try to call this routine. Link: https://lore.kernel.org/lkml/37a29c383bff2fb1605241ee6c7c9be3784fb3c6.1613171185.git.skhan@linuxfoundation.org/ Link: https://lore.kernel.org/linux-wireless/871rdmu9z9.fsf@codeaurora.org/ Acked-by: Kalle Valo Signed-off-by: Shuah Khan --- drivers/net/wireless/ath/ath10k/mac.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c index 7d98250380ec..a595ff4f0843 100644 --- a/drivers/net/wireless/ath/ath10k/mac.c +++ b/drivers/net/wireless/ath/ath10k/mac.c @@ -4567,6 +4567,8 @@ 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) { + lockdep_assert_not_held(&ar->conf_mutex); + /* make sure rcu-protected mac80211 tx path itself is drained */ synchronize_net();