From patchwork Sun Sep 27 19:48:52 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 258395 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 08F00C4346E for ; Sun, 27 Sep 2020 19:57:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C2B8423A5A for ; Sun, 27 Sep 2020 19:57:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="KbehhohW"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="cWc0Cj3h" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726981AbgI0T5U (ORCPT ); Sun, 27 Sep 2020 15:57:20 -0400 Received: from Galois.linutronix.de ([193.142.43.55]:40808 "EHLO galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726876AbgI0T5Q (ORCPT ); Sun, 27 Sep 2020 15:57:16 -0400 Message-Id: <20200927194920.437625772@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1601236633; 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=Nr+HwxG8LNdSmT94mAamQPUuBl65nafz2ip56wkroJ0=; b=KbehhohWE2i0RJJ/I4NPEnvmzRPqQAwTJ9c795tOfUYyQoKJ1QT3SZdKrdNNY0yFoQZY5H Rriou1lrgdkocgTrlrPnbRpu2IiQc+I5ybI6hf2y7FJRJcxRW5lXQHWE+ZqgBQ4Gx1gEah 5saPaD1AeNCkcvophqbUNF8e2L8NxLUVk06WFGvAnnSUjwvOcPQF6o5IFK7xzNa2Zpd2CI 1QxIChyN4I5dHa9UKRW1gAOgIToLg11A14tDhL7jtoBH5ee30muaiSywjrjn9wpIOOFvs3 EWQvhHRwO8Eh7ZInAnN71OVEM2pAMgf15hno4dnlQd53rMB2TtDg6/qVcLJJDg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1601236633; 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=Nr+HwxG8LNdSmT94mAamQPUuBl65nafz2ip56wkroJ0=; b=cWc0Cj3hMdO2yBy/o5JKdrFUXDXwIiJqV12pCuzu1xmC2epM8ctXhUBINnzLyDh82L8Iox bnLfDgsDy3FKXbDw== Date: Sun, 27 Sep 2020 21:48:52 +0200 From: Thomas Gleixner To: LKML Cc: Peter Zijlstra , Linus Torvalds , Paul McKenney , Matthew Wilcox , Vishal Kulkarni , "David S. Miller" , Jakub Kicinski , netdev@vger.kernel.org, Christian Benvenuti , Govindarajulu Varadarajan <_govind@gmx.com>, Dave Miller , Jonathan Corbet , Mauro Carvalho Chehab , linux-doc@vger.kernel.org, Sebastian Andrzej Siewior , Luc Van Oostenryck , Jay Cliburn , Chris Snook , 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 06/35] net: cxgb3: Cleanup 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: Thomas Gleixner t3_sge_stop() is called from task context and from error handlers in interrupt context. It relies on in_interrupt() to differentiate the contexts. in_interrupt() is deprecated as it is ill defined and does not provide what it suggests. Instead of replacing it with some other construct, simply split the function into t3_sge_stop_dma(), which can be called from any context, and t3_sge_stop() which can be only called from task context. This has the advantage that any bogus invocation of t3_sge_stop() from wrong contexts can be caught by debug kernels instead of being papered over by the conditional. Signed-off-by: Thomas Gleixner Cc: Vishal Kulkarni Cc: "David S. Miller" Cc: Jakub Kicinski Cc: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org --- drivers/net/ethernet/chelsio/cxgb3/adapter.h | 1 drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c | 2 - drivers/net/ethernet/chelsio/cxgb3/sge.c | 44 ++++++++++++++---------- 3 files changed, 29 insertions(+), 18 deletions(-) --- a/drivers/net/ethernet/chelsio/cxgb3/adapter.h +++ b/drivers/net/ethernet/chelsio/cxgb3/adapter.h @@ -313,6 +313,7 @@ void t3_os_link_fault(struct adapter *ad void t3_os_link_fault_handler(struct adapter *adapter, int port_id); void t3_sge_start(struct adapter *adap); +void t3_sge_stop_dma(struct adapter *adap); void t3_sge_stop(struct adapter *adap); void t3_start_sge_timers(struct adapter *adap); void t3_stop_sge_timers(struct adapter *adap); --- a/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c +++ b/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c @@ -2996,7 +2996,7 @@ void t3_fatal_err(struct adapter *adapte unsigned int fw_status[4]; if (adapter->flags & FULL_INIT_DONE) { - t3_sge_stop(adapter); + t3_sge_stop_dma(adapter); t3_write_reg(adapter, A_XGM_TX_CTRL, 0); t3_write_reg(adapter, A_XGM_RX_CTRL, 0); t3_write_reg(adapter, XGM_REG(A_XGM_TX_CTRL, 1), 0); --- a/drivers/net/ethernet/chelsio/cxgb3/sge.c +++ b/drivers/net/ethernet/chelsio/cxgb3/sge.c @@ -3271,30 +3271,40 @@ void t3_sge_start(struct adapter *adap) } /** - * t3_sge_stop - disable SGE operation + * t3_sge_stop_dma - Disable SGE DMA engine operation * @adap: the adapter * - * Disables the DMA engine. This can be called in emeregencies (e.g., - * from error interrupts) or from normal process context. In the latter - * case it also disables any pending queue restart tasklets. Note that - * if it is called in interrupt context it cannot disable the restart - * tasklets as it cannot wait, however the tasklets will have no effect - * since the doorbells are disabled and the driver will call this again - * later from process context, at which time the tasklets will be stopped - * if they are still running. + * Can be invoked from interrupt context e.g. error handler. + * + * Note that this function cannot disable the restart of tasklets as + * it cannot wait if called from interrupt context, however the + * tasklets will have no effect since the doorbells are disabled. The + * driver will call tg3_sge_stop() later from process context, at + * which time the tasklets will be stopped if they are still running. */ -void t3_sge_stop(struct adapter *adap) +void t3_sge_stop_dma(struct adapter *adap) { t3_set_reg_field(adap, A_SG_CONTROL, F_GLOBALENABLE, 0); - if (!in_interrupt()) { - int i; +} + +/** + * t3_sge_stop - disable SGE operation completly + * @adap: the adapter + * + * Called from process context. Disables the DMA engine and any + * pending queue restart tasklets. + */ +void t3_sge_stop(struct adapter *adap) +{ + int i; + + t3_sge_stop_dma(adap); - for (i = 0; i < SGE_QSETS; ++i) { - struct sge_qset *qs = &adap->sge.qs[i]; + for (i = 0; i < SGE_QSETS; ++i) { + struct sge_qset *qs = &adap->sge.qs[i]; - tasklet_kill(&qs->txq[TXQ_OFLD].qresume_tsk); - tasklet_kill(&qs->txq[TXQ_CTRL].qresume_tsk); - } + tasklet_kill(&qs->txq[TXQ_OFLD].qresume_tsk); + tasklet_kill(&qs->txq[TXQ_CTRL].qresume_tsk); } }