dmaengine: sf-pdma: 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: Barry Song <song.bao.hua@hisilicon.com>
Cc: Green Wan <green.wan@sifive.com>
Link: https://lore.kernel.org/r/20201027215252.25820-4-song.bao.hua@hisilicon.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/sf-pdma/sf-pdma.c

@@ -326,10 +326,9 @@ static irqreturn_t sf_pdma_done_isr(int irq, void *dev_id)
 {
 	struct sf_pdma_chan *chan = dev_id;
 	struct pdma_regs *regs = &chan->regs;
-	unsigned long flags;
 	u64 residue;
 
-	spin_lock_irqsave(&chan->vchan.lock, flags);
+	spin_lock(&chan->vchan.lock);
 	writel((readl(regs->ctrl)) & ~PDMA_DONE_STATUS_MASK, regs->ctrl);
 	residue = readq(regs->residue);
 
@@ -346,7 +345,7 @@ static irqreturn_t sf_pdma_done_isr(int irq, void *dev_id)
 		sf_pdma_xfer_desc(chan);
 	}
 
-	spin_unlock_irqrestore(&chan->vchan.lock, flags);
+	spin_unlock(&chan->vchan.lock);
 
 	return IRQ_HANDLED;
 }
@@ -355,11 +354,10 @@ static irqreturn_t sf_pdma_err_isr(int irq, void *dev_id)
 {
 	struct sf_pdma_chan *chan = dev_id;
 	struct pdma_regs *regs = &chan->regs;
-	unsigned long flags;
 
-	spin_lock_irqsave(&chan->lock, flags);
+	spin_lock(&chan->lock);
 	writel((readl(regs->ctrl)) & ~PDMA_ERR_STATUS_MASK, regs->ctrl);
-	spin_unlock_irqrestore(&chan->lock, flags);
+	spin_unlock(&chan->lock);
 
 	tasklet_schedule(&chan->err_tasklet);