dmaengine: tegra210-adma: remove redundant irqsave and irqrestore in hardIRQ

Running in hardIRQ, disabling IRQ is redundant since hardIRQ has disabled
IRQ. This patch removes the irqsave and irqstore to save some instruction
cycles.
Signed-off-by: NBarry Song <song.bao.hua@hisilicon.com>
Acked-by: NJon Hunter <jonathanh@nvidia.com>
Cc: Laxman Dewangan <ldewangan@nvidia.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Link: https://lore.kernel.org/r/20201027215252.25820-5-song.bao.hua@hisilicon.comSigned-off-by: NVinod Koul <vkoul@kernel.org>

drivers/dma/tegra210-adma.c

@@ -408,19 +408,18 @@ static irqreturn_t tegra_adma_isr(int irq, void *dev_id)
 {
 	struct tegra_adma_chan *tdc = dev_id;
 	unsigned long status;
-	unsigned long flags;
 
-	spin_lock_irqsave(&tdc->vc.lock, flags);
+	spin_lock(&tdc->vc.lock);
 
 	status = tegra_adma_irq_clear(tdc);
 	if (status == 0 || !tdc->desc) {
-		spin_unlock_irqrestore(&tdc->vc.lock, flags);
+		spin_unlock(&tdc->vc.lock);
 		return IRQ_NONE;
 	}
 
 	vchan_cyclic_callback(&tdc->desc->vd);
 
-	spin_unlock_irqrestore(&tdc->vc.lock, flags);
+	spin_unlock(&tdc->vc.lock);
 
 	return IRQ_HANDLED;
 }