dmaengine: at_xdmac: Remove a level of indentation in at_xdmac_tasklet()

Apart of making the code easier to read, this patch is a prerequisite for
a functional change: tasklets run with interrupts enabled, so we need to
protect atchan->irq_status with spin_lock_irq() otherwise the tasklet can
be interrupted by the IRQ that modifies irq_status. atchan->irq_status
will be protected in a further patch.
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Link: https://lore.kernel.org/r/20211215110115.191749-12-tudor.ambarus@microchip.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/at_xdmac.c

@@ -1667,27 +1667,27 @@ static void at_xdmac_tasklet(struct tasklet_struct *t)
 {
 	struct at_xdmac_chan	*atchan = from_tasklet(atchan, t, tasklet);
 	struct at_xdmac_desc	*desc;
+	struct dma_async_tx_descriptor *txd;
 	u32			error_mask;
 
 	dev_dbg(chan2dev(&atchan->chan), "%s: status=0x%08x\n",
 		__func__, atchan->irq_status);
 
-	error_mask = AT_XDMAC_CIS_RBEIS
-		     | AT_XDMAC_CIS_WBEIS
-		     | AT_XDMAC_CIS_ROIS;
+	if (at_xdmac_chan_is_cyclic(atchan))
+		return at_xdmac_handle_cyclic(atchan);
 
-	if (at_xdmac_chan_is_cyclic(atchan)) {
-		at_xdmac_handle_cyclic(atchan);
-	} else if ((atchan->irq_status & AT_XDMAC_CIS_LIS)
-		   || (atchan->irq_status & error_mask)) {
-		struct dma_async_tx_descriptor  *txd;
+	error_mask = AT_XDMAC_CIS_RBEIS | AT_XDMAC_CIS_WBEIS |
+		AT_XDMAC_CIS_ROIS;
+
+	if (!(atchan->irq_status & AT_XDMAC_CIS_LIS) &&
+	    !(atchan->irq_status & error_mask))
+		return;
 
 	if (atchan->irq_status & error_mask)
 		at_xdmac_handle_error(atchan);
 
 	spin_lock_irq(&atchan->lock);
-		desc = list_first_entry(&atchan->xfers_list,
-					struct at_xdmac_desc,
+	desc = list_first_entry(&atchan->xfers_list, struct at_xdmac_desc,
 				xfer_node);
 	dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc);
 	if (!desc->active_xfer) {
@@ -1709,11 +1709,9 @@ static void at_xdmac_tasklet(struct tasklet_struct *t)
 
 	spin_lock_irq(&atchan->lock);
 	/* Move the xfer descriptors into the free descriptors list. */
-		list_splice_tail_init(&desc->descs_list,
-				      &atchan->free_descs_list);
+	list_splice_tail_init(&desc->descs_list, &atchan->free_descs_list);
 	at_xdmac_advance_work(atchan);
 	spin_unlock_irq(&atchan->lock);
-	}
 }
 
 static irqreturn_t at_xdmac_interrupt(int irq, void *dev_id)