From patchwork Sun Sep 27 19:49:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 258385 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=-7.0 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 99EDAC4346E for ; Sun, 27 Sep 2020 20:00:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 68B9B23A53 for ; Sun, 27 Sep 2020 20:00:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="XwDPR8Kf"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="5eiMnruQ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727365AbgI0T7r (ORCPT ); Sun, 27 Sep 2020 15:59:47 -0400 Received: from Galois.linutronix.de ([193.142.43.55]:41642 "EHLO galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727028AbgI0T6D (ORCPT ); Sun, 27 Sep 2020 15:58:03 -0400 Message-Id: <20200927194922.722439719@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1601236661; 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=WvKjADYjqlirQWpKFkh9jiGNfOCHnSN3m3D0jVUtW0s=; b=XwDPR8KfhhwdgM2h3NXTwz7S032tPQFhsINIdBsrnxyP9xEIwf9JmvxDxIDGkwJhi4fwsG 4jvQ/uRtX1vttmdiFbJHm4ezHJNt3bCShDxDaUvSfhBTOm/RkxdeJVnW88dvf9PLLy3OGo vHOr6TBL43ji8aWZNzBoqQJ7OgeTmJ6wp0xFDunenDs+jppIUe4HkFoOgH18K249SYQ6Q3 IWsmuizwOoi5ttWgeDOX5I8Zx/OXCLtPXYxotFDSoT8DgXcpWS3+FaUaj2sj338D7H8uqH sT5fHF8WghHkzuK7LQdE7N0LB1JjJR2LsCP5jhxjNwP7oDBbC6vFq6II02AmnA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1601236661; 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=WvKjADYjqlirQWpKFkh9jiGNfOCHnSN3m3D0jVUtW0s=; b=5eiMnruQvx3MYP7nVlqCqSPo+NiHBVbHE0sWnKSIYRXN5H1WKNKQKtiPGb9iUFiHaZTWcN op8hWZ7x4vBnp6Dg== Date: Sun, 27 Sep 2020 21:49:15 +0200 From: Thomas Gleixner To: LKML Cc: Peter Zijlstra , Linus Torvalds , Paul McKenney , Matthew Wilcox , Sebastian Andrzej Siewior , Jouni Malinen , Kalle Valo , "David S. Miller" , Jakub Kicinski , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, Christian Benvenuti , Govindarajulu Varadarajan <_govind@gmx.com>, Dave Miller , Jonathan Corbet , Mauro Carvalho Chehab , linux-doc@vger.kernel.org, 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 , 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 , Amitkumar Karwar , Ganapathi Bhat , Xinming Hu , libertas-dev@lists.infradead.org, Pascal Terjan , Ping-Ke Shih Subject: [patch 29/35] net: hostap: Remove in_interrupt() usage References: <20200927194846.045411263@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. hfa384x_cmd() and prism2_hw_reset() check in_interrupt() at function entry and if true emit a printk at debug loglevel and return. This is clearly debug code. Both functions invoke functions which can sleep. These functions already have appropriate debug checks which cover all invalid contexts, while in_interrupt() fails to detect context which just has preemption or interrupts disabled. Remove both checks as they are incomplete, debug only and already covered by the subsequently invoked functions properly. If called from invalid context the resulting back trace is definitely more helpful to analyze the problem than a printk at debug loglevel. Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Thomas Gleixner Cc: Jouni Malinen Cc: Kalle Valo Cc: "David S. Miller" Cc: Jakub Kicinski Cc: linux-wireless@vger.kernel.org Cc: netdev@vger.kernel.org --- drivers/net/wireless/intersil/hostap/hostap_hw.c | 12 ------------ 1 file changed, 12 deletions(-) --- a/drivers/net/wireless/intersil/hostap/hostap_hw.c +++ b/drivers/net/wireless/intersil/hostap/hostap_hw.c @@ -320,12 +320,6 @@ static int hfa384x_cmd(struct net_device iface = netdev_priv(dev); local = iface->local; - if (in_interrupt()) { - printk(KERN_DEBUG "%s: hfa384x_cmd called from interrupt " - "context\n", dev->name); - return -1; - } - if (local->cmd_queue_len >= HOSTAP_CMD_QUEUE_MAX_LEN) { printk(KERN_DEBUG "%s: hfa384x_cmd: cmd_queue full\n", dev->name); @@ -1560,12 +1554,6 @@ static void prism2_hw_reset(struct net_d iface = netdev_priv(dev); local = iface->local; - if (in_interrupt()) { - printk(KERN_DEBUG "%s: driver bug - prism2_hw_reset() called " - "in interrupt context\n", dev->name); - return; - } - if (local->hw_downloading) return;