dmaengine: plx_dma: Move spin_lock_bh() to spin_lock()

It is unnecessary to call spin_lock_bh() if you are already in a tasklet.
Signed-off-by: Yunbo Yu <yuyunbo519@gmail.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Link: https://lore.kernel.org/r/20220418142021.1241558-1-yuyunbo519@gmail.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/plx_dma.c

@@ -137,7 +137,7 @@ static void plx_dma_process_desc(struct plx_dma_dev *plxdev)
 	struct plx_dma_desc *desc;
 	u32 flags;
 
-	spin_lock_bh(&plxdev->ring_lock);
+	spin_lock(&plxdev->ring_lock);
 
 	while (plxdev->tail != plxdev->head) {
 		desc = plx_dma_get_desc(plxdev, plxdev->tail);
@@ -165,7 +165,7 @@ static void plx_dma_process_desc(struct plx_dma_dev *plxdev)
 		plxdev->tail++;
 	}
 
-	spin_unlock_bh(&plxdev->ring_lock);
+	spin_unlock(&plxdev->ring_lock);
 }
 
 static void plx_dma_abort_desc(struct plx_dma_dev *plxdev)