dmaengine: pxa_dma: 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>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Cc: Daniel Mack <daniel@zonque.org>
Cc: Haojian Zhuang <haojian.zhuang@gmail.com>
Link: https://lore.kernel.org/r/20201027215252.25820-11-song.bao.hua@hisilicon.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/pxa_dma.c

@@ -606,7 +606,6 @@ static irqreturn_t pxad_chan_handler(int irq, void *dev_id)
 	struct pxad_chan *chan = phy->vchan;
 	struct virt_dma_desc *vd, *tmp;
 	unsigned int dcsr;
-	unsigned long flags;
 	bool vd_completed;
 	dma_cookie_t last_started = 0;
 
@@ -616,7 +615,7 @@ static irqreturn_t pxad_chan_handler(int irq, void *dev_id)
 	if (dcsr & PXA_DCSR_RUN)
 		return IRQ_NONE;
 
-	spin_lock_irqsave(&chan->vc.lock, flags);
+	spin_lock(&chan->vc.lock);
 	list_for_each_entry_safe(vd, tmp, &chan->vc.desc_issued, node) {
 		vd_completed = is_desc_completed(vd);
 		dev_dbg(&chan->vc.chan.dev->device,
@@ -658,7 +657,7 @@ static irqreturn_t pxad_chan_handler(int irq, void *dev_id)
 			pxad_launch_chan(chan, to_pxad_sw_desc(vd));
 		}
 	}
-	spin_unlock_irqrestore(&chan->vc.lock, flags);
+	spin_unlock(&chan->vc.lock);
 	wake_up(&chan->wq_state);
 
 	return IRQ_HANDLED;