[v1,1/2] dmaengine: tegra-apb: Don't save/restore IRQ flags in interrupt handler
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Message ID 20200319205228.8883-1-digetx@gmail.com
State New
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Series
  • [v1,1/2] dmaengine: tegra-apb: Don't save/restore IRQ flags in interrupt handler
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Commit Message

Dmitry Osipenko March 19, 2020, 8:52 p.m. UTC
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 <digetx@gmail.com>
---
 drivers/dma/tegra20-apb-dma.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

Patch
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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);