linux-kernel - [PATCH] dmaengine: moxart-dma: replace spin_lock_irqsave with spin

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Message-Id: <20180911141730.52469-1-hangdianqj@163.com>
Date:   Tue, 11 Sep 2018 07:17:30 -0700
From:   jun qian <hangdianqj@....com>
To:     Dan Williams <dan.j.williams@...el.com>,
        Vinod Koul <vkoul@...nel.org>
Cc:     dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        jun qian <hangdianqj@....com>, Barry song <21cnbao@...il.com>
Subject: [PATCH] dmaengine: moxart-dma:  replace spin_lock_irqsave with spin_lock in ISR

As you are already in ISR, it is unnecessary to call spin_lock_irqsave.

Signed-off-by: jun qian <hangdianqj@....com>
Cc: Barry song <21cnbao@...il.com>
---
 drivers/dma/moxart-dma.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/moxart-dma.c b/drivers/dma/moxart-dma.c
index e04499c1f27f..77958f123226 100644
--- a/drivers/dma/moxart-dma.c
+++ b/drivers/dma/moxart-dma.c
@@ -524,7 +524,6 @@ static irqreturn_t moxart_dma_interrupt(int irq, void *devid)
 	struct moxart_dmadev *mc = devid;
 	struct moxart_chan *ch = &mc->slave_chans[0];
 	unsigned int i;
-	unsigned long flags;
 	u32 ctrl;
 
 	dev_dbg(chan2dev(&ch->vc.chan), "%s\n", __func__);
@@ -541,14 +540,14 @@ static irqreturn_t moxart_dma_interrupt(int irq, void *devid)
 		if (ctrl & APB_DMA_FIN_INT_STS) {
 			ctrl &= ~APB_DMA_FIN_INT_STS;
 			if (ch->desc) {
-				spin_lock_irqsave(&ch->vc.lock, flags);
+				spin_lock(&ch->vc.lock);
 				if (++ch->sgidx < ch->desc->sglen) {
 					moxart_dma_start_sg(ch, ch->sgidx);
 				} else {
 					vchan_cookie_complete(&ch->desc->vd);
 					moxart_dma_start_desc(&ch->vc.chan);
 				}
-				spin_unlock_irqrestore(&ch->vc.lock, flags);
+				spin_unlock(&ch->vc.lock);
 			}
 		}
 
-- 
2.17.1