[PATCHv2 7/9] dmaengine: mv_xor: use devm for dma pool and irq

[Rosen Penev <rosenp@gmail.com>]

Replace dma_alloc_wc() with dmam_alloc_attrs() and request_irq() with
devm_request_irq(). This eliminates the need for manual cleanup of the dma
pool and irq in both the channel remove function and the channel add
error labels, removing the err_free_irq and err_free_dma labels entirely.

Assisted-by: opencode:big-pickle
Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
 drivers/dma/mv_xor.c | 23 +++++++----------------
 1 file changed, 7 insertions(+), 16 deletions(-)

diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c
index eefc8f22bec6..0c159b9e9216 100644
--- a/drivers/dma/mv_xor.c
+++ b/drivers/dma/mv_xor.c
@@ -1037,8 +1037,6 @@ static int mv_xor_channel_remove(struct mv_xor_chan *mv_chan)
 
 	dma_async_device_unregister(&mv_chan->dmadev);
 
-	dma_free_wc(dev, MV_XOR_POOL_SIZE,
-			  mv_chan->dma_desc_pool_virt, mv_chan->dma_desc_pool);
 	dma_unmap_single(dev, mv_chan->dummy_src_addr,
 			 MV_XOR_MIN_BYTE_COUNT, DMA_FROM_DEVICE);
 	dma_unmap_single(dev, mv_chan->dummy_dst_addr,
@@ -1049,8 +1047,6 @@ static int mv_xor_channel_remove(struct mv_xor_chan *mv_chan)
 		list_del(&chan->device_node);
 	}
 
-	free_irq(mv_chan->irq, mv_chan);
-
 	return 0;
 }
 
@@ -1113,8 +1109,8 @@ mv_xor_channel_add(struct mv_xor_device *xordev,
 	 * requires that we explicitly flush the writes
 	 */
 	mv_chan->dma_desc_pool_virt =
-	  dma_alloc_wc(&pdev->dev, MV_XOR_POOL_SIZE, &mv_chan->dma_desc_pool,
-		       GFP_KERNEL);
+	  dmam_alloc_attrs(&pdev->dev, MV_XOR_POOL_SIZE, &mv_chan->dma_desc_pool,
+			   GFP_KERNEL, DMA_ATTR_WRITE_COMBINE);
 	if (!mv_chan->dma_desc_pool_virt) {
 		ret = -ENOMEM;
 		goto err_unmap_dst;
@@ -1144,10 +1140,10 @@ mv_xor_channel_add(struct mv_xor_device *xordev,
 	/* clear errors before enabling interrupts */
 	mv_chan_clear_err_status(mv_chan);
 
-	ret = request_irq(mv_chan->irq, mv_xor_interrupt_handler,
+	ret = devm_request_irq(&pdev->dev, mv_chan->irq, mv_xor_interrupt_handler,
 			  0, dev_name(&pdev->dev), mv_chan);
 	if (ret)
-		goto err_free_dma;
+		goto err_unmap_dst;
 
 	mv_chan_unmask_interrupts(mv_chan);
 
@@ -1162,14 +1158,14 @@ mv_xor_channel_add(struct mv_xor_device *xordev,
 		ret = mv_chan_memcpy_self_test(mv_chan);
 		dev_dbg(&pdev->dev, "memcpy self test returned %d\n", ret);
 		if (ret)
-			goto err_free_irq;
+			goto err_unmap_dst;
 	}
 
 	if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
 		ret = mv_chan_xor_self_test(mv_chan);
 		dev_dbg(&pdev->dev, "xor self test returned %d\n", ret);
 		if (ret)
-			goto err_free_irq;
+			goto err_unmap_dst;
 	}
 
 	dev_info(&pdev->dev, "Marvell XOR (%s): ( %s%s%s)\n",
@@ -1180,15 +1176,10 @@ mv_xor_channel_add(struct mv_xor_device *xordev,
 
 	ret = dma_async_device_register(dma_dev);
 	if (ret)
-		goto err_free_irq;
+		goto err_unmap_dst;
 
 	return mv_chan;
 
-err_free_irq:
-	free_irq(mv_chan->irq, mv_chan);
-err_free_dma:
-	dma_free_wc(&pdev->dev, MV_XOR_POOL_SIZE,
-			  mv_chan->dma_desc_pool_virt, mv_chan->dma_desc_pool);
 err_unmap_dst:
 	dma_unmap_single(dma_dev->dev, mv_chan->dummy_dst_addr,
 			 MV_XOR_MIN_BYTE_COUNT, DMA_TO_DEVICE);
-- 
2.54.0