From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dmitry Osipenko 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> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: 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 Sender: linux-i2c-owner@vger.kernel.org List-Id: linux-i2c@vger.kernel.org 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 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); -- 2.25.1