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 <[e-mail]>
Reviewed-by: Logan Gunthorpe <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

drivers/dma/plx_dma.c

···
 	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);
···
 		plxdev->tail++;
 	}
 
-	spin_unlock_bh(&plxdev->ring_lock);
+	spin_unlock(&plxdev->ring_lock);
 }
 
 static void plx_dma_abort_desc(struct plx_dma_dev *plxdev)