From patchwork Thu Mar 19 20:52:27 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Osipenko X-Patchwork-Id: 1258437 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-tegra-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20161025 header.b=Sl3qviOG; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 48jzdq3BfPz9sP7 for ; Fri, 20 Mar 2020 07:53:35 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727064AbgCSUx0 (ORCPT ); Thu, 19 Mar 2020 16:53:26 -0400 Received: from mail-lf1-f67.google.com ([209.85.167.67]:39242 "EHLO mail-lf1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725817AbgCSUx0 (ORCPT ); Thu, 19 Mar 2020 16:53:26 -0400 Received: by mail-lf1-f67.google.com with SMTP id j15so2821956lfk.6; Thu, 19 Mar 2020 13:53:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=VQOqpNHGnRKqa1sVk84jtgEeheH2BERwpE6r8gHxAwI=; b=Sl3qviOGUGcq21NwxmkMyha+skQwAVSa5SALUzxn2Ds40Mk6CdYbDlTvxemxMzyYPR ZzvqoF4kMign3pl2qO27q9vskJPFCdExM0ue7Vp9LBaDchDttasy3hF5bHSvzLGikWQD BpNIJvCyVd3k7ofcml0LcAHRjrI7Sq+aHGfskNVweF2Kz+a5Cxb+teB6sF/Avz9S9IhO USm2BIWEo+bUtGHnpdHJ5sBncpsMREt+XKjbDhkuYHHhfgWrtAuTc62Z82FozlEuVBRr Fp1tAF5pNDchv8w6+S3hKfldDZ4u6+sCIRxFofm1imtW0N6aA3T0PxMHJOnRs672qIY3 wbqg== 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=VQOqpNHGnRKqa1sVk84jtgEeheH2BERwpE6r8gHxAwI=; b=txomMYu7FKuQeMXd1y7bawoY3HuDmuwsWcEY8I3ShVH7usri+Xsp4AKlmIbsQyfFp/ mRlhOrK3Izj7UOro1byL0v65gFY6HA9jfliURVMJazy3IT3hUawDhcJ0NQwyIPJL8Zto yNRyImD4Y8ONdSeQ2iYDfLQM4DO+cuHGPUaMBodY4/KkZ1LnTWwMTPQumcq4kF1fgpr+ OMYNNd/ckNbWThgyw2e99qvWLf1mi3nc//X/+YV6oj3s6gSNDDIM8y9tOgZ7qMAionem mSCaRiutcLi+W5BjYDPV0uelD5dEBQ4bts233Ih36AejDsng3Cyzcs78oBBX0jMWulFO HT0Q== X-Gm-Message-State: ANhLgQ23PvSnd9JRerXYUKz4XwBJJ/TQtOszqGc3gI9840AUyon8gcGD XyxA2w92fh8JQj5DQn6YToQ= X-Google-Smtp-Source: ADFU+vsc3c/MwtGCczXQuWkx6DHW6qLqYcGdD+uVtu8ONWi4VFFUYKaZpRo12NRQRiDoVSOqOON5gA== X-Received: by 2002:a19:5008:: with SMTP id e8mr2181030lfb.32.1584651202774; Thu, 19 Mar 2020 13:53:22 -0700 (PDT) Received: from localhost.localdomain (94-29-39-224.dynamic.spd-mgts.ru. [94.29.39.224]) by smtp.gmail.com with ESMTPSA id u10sm2108661ljk.56.2020.03.19.13.53.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 19 Mar 2020 13:53:22 -0700 (PDT) From: Dmitry Osipenko To: Thierry Reding , Jonathan Hunter , Laxman Dewangan , Vinod Koul , Dan Williams Cc: Wolfram Sang , linux-i2c@vger.kernel.org, linux-tegra@vger.kernel.org, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v1 1/2] dmaengine: tegra-apb: Don't save/restore IRQ flags in interrupt handler Date: Thu, 19 Mar 2020 23:52:27 +0300 Message-Id: <20200319205228.8883-1-digetx@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Sender: linux-tegra-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-tegra@vger.kernel.org The interrupt is already disabled while interrupt handler is running, and thus, there is no need to save/restore the IRQ flags within the spinlock. Signed-off-by: Dmitry Osipenko --- drivers/dma/tegra20-apb-dma.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c index 4e295d121be6..26f427e02369 100644 --- a/drivers/dma/tegra20-apb-dma.c +++ b/drivers/dma/tegra20-apb-dma.c @@ -672,10 +672,9 @@ static void tegra_dma_tasklet(unsigned long data) static irqreturn_t tegra_dma_isr(int irq, void *dev_id) { struct tegra_dma_channel *tdc = dev_id; - unsigned long flags; u32 status; - spin_lock_irqsave(&tdc->lock, flags); + spin_lock(&tdc->lock); trace_tegra_dma_isr(&tdc->dma_chan, irq); status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS); @@ -683,11 +682,11 @@ static irqreturn_t tegra_dma_isr(int irq, void *dev_id) tdc_write(tdc, TEGRA_APBDMA_CHAN_STATUS, status); tdc->isr_handler(tdc, false); tasklet_schedule(&tdc->tasklet); - spin_unlock_irqrestore(&tdc->lock, flags); + spin_unlock(&tdc->lock); return IRQ_HANDLED; } - spin_unlock_irqrestore(&tdc->lock, flags); + spin_unlock(&tdc->lock); dev_info(tdc2dev(tdc), "Interrupt already served status 0x%08x\n", status);