From patchwork Tue Sep 29 20:25:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 297434 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=-6.9 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 69A02C47437 for ; Tue, 29 Sep 2020 20:36:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 05D8C21548 for ; Tue, 29 Sep 2020 20:36:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="vRU6BfuH"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="LEfYKg1x" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729511AbgI2UgR (ORCPT ); Tue, 29 Sep 2020 16:36:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37228 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729392AbgI2Uf4 (ORCPT ); Tue, 29 Sep 2020 16:35:56 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 60043C061755; Tue, 29 Sep 2020 13:35:56 -0700 (PDT) Message-Id: <20200929203500.772444384@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1601411754; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: references:references; bh=ZU7NcQAsE/kj7cmUnOD5K9JFij/BoI0exU4lajDmnJ4=; b=vRU6BfuHOIAfBrVtu4hT7bOoSqNXK0UJcuUCnpmMR01XxLkNiw61gZAphCtJXKCWE5K1i7 IJgQN52kyuidE9vQgzXypCAyr/TpToMGyk9vkHe+DlbJNfFGZSYs/NGwJ9D2ONoM2IU5Zw e+7S0mXG+Q1pyH7obsScTtFz8BiaioaXHn5oAupcsRCsLuGD/BLOGoblxRQGDEX1Q8ApS0 CQbP4O88pIhIbkxZySum376e0s3/17XKI+Gu6XgErrMSBBy1fyp3qCjBpD48xFUOUtKKBQ W2NNaEKkJgaL98SY7jwux0HGwK9aR2mFw5NIEs+9NYNIBpgTWAtGu7VZYGiZcw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1601411754; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: references:references; bh=ZU7NcQAsE/kj7cmUnOD5K9JFij/BoI0exU4lajDmnJ4=; b=LEfYKg1xG9lkdKgkKbBAn3aXuZsx2d/HLM7tuC+OD/dzExOSuTCCuQ+uxV82IUN/TWajPk Ybp+2Mpr+f/6D4Bg== Date: Tue, 29 Sep 2020 22:25:22 +0200 From: Thomas Gleixner To: LKML Cc: Peter Zijlstra , Paul McKenney , Matthew Wilcox , Christian Benvenuti , Govindarajulu Varadarajan <_govind@gmx.com>, Dave Miller , Jakub Kicinski , netdev@vger.kernel.org, Jonathan Corbet , Mauro Carvalho Chehab , linux-doc@vger.kernel.org, Sebastian Andrzej Siewior , Luc Van Oostenryck , Jay Cliburn , Chris Snook , Vishal Kulkarni , Jeff Kirsher , intel-wired-lan@lists.osuosl.org, Shannon Nelson , Pensando Drivers , Andrew Lunn , Heiner Kallweit , Russell King , Thomas Bogendoerfer , Solarflare linux maintainers , Edward Cree , Martin Habets , Jon Mason , Daniel Drake , Ulrich Kunitz , Kalle Valo , linux-wireless@vger.kernel.org, linux-usb@vger.kernel.org, Greg Kroah-Hartman , Arend van Spriel , Franky Lin , Hante Meuleman , Chi-Hsien Lin , Wright Feng , brcm80211-dev-list.pdl@broadcom.com, brcm80211-dev-list@cypress.com, Stanislav Yakovlev , Stanislaw Gruszka , Johannes Berg , Emmanuel Grumbach , Luca Coelho , Intel Linux Wireless , Jouni Malinen , Amitkumar Karwar , Ganapathi Bhat , Xinming Hu , libertas-dev@lists.infradead.org, Pascal Terjan , Ping-Ke Shih Subject: [patch V2 13/36] net: mdiobus: Remove WARN_ON_ONCE(in_interrupt()) References: <20200929202509.673358734@linutronix.de> MIME-Version: 1.0 Content-transfer-encoding: 8-bit Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org From: Sebastian Andrzej Siewior in_interrupt() is ill defined and does not provide what the name suggests. The usage especially in driver code is deprecated and a tree wide effort to clean up and consolidate the (ab)usage of in_interrupt() and related checks is happening. In this case the check covers only parts of the contexts in which these functions cannot be called. It fails to detect preemption or interrupt disabled invocations. As the functions which contain these warnings invoke mutex_lock() which contains a broad variety of checks (always enabled or debug option dependent) and therefore covers all invalid conditions already, there is no point in having inconsistent warnings in those drivers. The conditional return is not really valuable in practice either. Just remove them. Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Thomas Gleixner Reviewed-by: Andrew Lunn --- drivers/net/phy/mdio_bus.c | 15 --------------- 1 file changed, 15 deletions(-) --- a/drivers/net/phy/mdio_bus.c +++ b/drivers/net/phy/mdio_bus.c @@ -825,9 +825,6 @@ int mdiobus_read_nested(struct mii_bus * { int retval; - if (WARN_ON_ONCE(in_interrupt())) - return -EINVAL; - mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED); retval = __mdiobus_read(bus, addr, regnum); mutex_unlock(&bus->mdio_lock); @@ -850,9 +847,6 @@ int mdiobus_read(struct mii_bus *bus, in { int retval; - if (WARN_ON_ONCE(in_interrupt())) - return -EINVAL; - mutex_lock(&bus->mdio_lock); retval = __mdiobus_read(bus, addr, regnum); mutex_unlock(&bus->mdio_lock); @@ -879,9 +873,6 @@ int mdiobus_write_nested(struct mii_bus { int err; - if (WARN_ON_ONCE(in_interrupt())) - return -EINVAL; - mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED); err = __mdiobus_write(bus, addr, regnum, val); mutex_unlock(&bus->mdio_lock); @@ -905,9 +896,6 @@ int mdiobus_write(struct mii_bus *bus, i { int err; - if (WARN_ON_ONCE(in_interrupt())) - return -EINVAL; - mutex_lock(&bus->mdio_lock); err = __mdiobus_write(bus, addr, regnum, val); mutex_unlock(&bus->mdio_lock); @@ -929,9 +917,6 @@ int mdiobus_modify(struct mii_bus *bus, { int err; - if (WARN_ON_ONCE(in_interrupt())) - return -EINVAL; - mutex_lock(&bus->mdio_lock); err = __mdiobus_modify_changed(bus, addr, regnum, mask, set); mutex_unlock(&bus->mdio_lock);