[PATCHv4] dmaengine: at_hdmac: use devm APIs in at_dma_probe()

Convert resource allocation and setup in probe() to use devm-managed APIs.
Simplify the error handling path and remove explicit cleanup code.

Assisted-by: opencode:big-pickle
Signed-off-by: Rosen Penev <[email protected]>
Reviewed-by: Frank Li <[email protected]>
---
 v4: adjust subject and description again
 v3: fix subject and description
 v2: remove list_del
 drivers/dma/at_hdmac.c | 50 ++++++++++--------------------------------
 1 file changed, 11 insertions(+), 39 deletions(-)

diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index 971f8bc9ec48..49a85ac66e83 100644
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -1986,40 +1986,34 @@ static int __init at_dma_probe(struct platform_device *pdev)
 	atdma->dma_device.cap_mask = plat_dat->cap_mask;
 	atdma->all_chan_mask = (1 << plat_dat->nr_channels) - 1;
 
-	atdma->clk = devm_clk_get(&pdev->dev, "dma_clk");
+	atdma->clk = devm_clk_get_enabled(&pdev->dev, "dma_clk");
 	if (IS_ERR(atdma->clk))
 		return PTR_ERR(atdma->clk);
 
-	err = clk_prepare_enable(atdma->clk);
-	if (err)
-		return err;
-
 	/* force dma off, just in case */
 	at_dma_off(atdma);
 
-	err = request_irq(irq, at_dma_interrupt, 0, "at_hdmac", atdma);
+	err = devm_request_irq(&pdev->dev, irq, at_dma_interrupt, 0, "at_hdmac", atdma);
 	if (err)
-		goto err_irq;
+		return err;
 
 	platform_set_drvdata(pdev, atdma);
 
 	/* create a pool of consistent memory blocks for hardware descriptors */
-	atdma->lli_pool = dma_pool_create("at_hdmac_lli_pool",
+	atdma->lli_pool = dmam_pool_create("at_hdmac_lli_pool",
 					  &pdev->dev, sizeof(struct at_lli),
 					  4 /* word alignment */, 0);
 	if (!atdma->lli_pool) {
 		dev_err(&pdev->dev, "Unable to allocate DMA LLI descriptor pool\n");
-		err = -ENOMEM;
-		goto err_desc_pool_create;
+		return -ENOMEM;
 	}
 
 	/* create a pool of consistent memory blocks for memset blocks */
-	atdma->memset_pool = dma_pool_create("at_hdmac_memset_pool",
+	atdma->memset_pool = dmam_pool_create("at_hdmac_memset_pool",
 					     &pdev->dev, sizeof(int), 4, 0);
 	if (!atdma->memset_pool) {
 		dev_err(&pdev->dev, "No memory for memset dma pool\n");
-		err = -ENOMEM;
-		goto err_memset_pool_create;
+		return -ENOMEM;
 	}
 
 	/* clear any pending interrupt */
@@ -2086,10 +2080,10 @@ static int __init at_dma_probe(struct platform_device *pdev)
 	  dma_has_cap(DMA_SLAVE, atdma->dma_device.cap_mask)  ? "slave " : "",
 	  plat_dat->nr_channels);
 
-	err = dma_async_device_register(&atdma->dma_device);
+	err = dmaenginem_async_device_register(&atdma->dma_device);
 	if (err) {
 		dev_err(&pdev->dev, "Unable to register: %d.\n", err);
-		goto err_dma_async_device_register;
+		return err;
 	}
 
 	/*
@@ -2098,27 +2092,15 @@ static int __init at_dma_probe(struct platform_device *pdev)
 	 * dma_request_channel().
 	 */
 	if (pdev->dev.of_node) {
-		err = of_dma_controller_register(pdev->dev.of_node,
+		err = devm_of_dma_controller_register(&pdev->dev, pdev->dev.of_node,
 						 at_dma_xlate, atdma);
 		if (err) {
 			dev_err(&pdev->dev, "could not register of_dma_controller\n");
-			goto err_of_dma_controller_register;
+			return err;
 		}
 	}
 
 	return 0;
-
-err_of_dma_controller_register:
-	dma_async_device_unregister(&atdma->dma_device);
-err_dma_async_device_register:
-	dma_pool_destroy(atdma->memset_pool);
-err_memset_pool_create:
-	dma_pool_destroy(atdma->lli_pool);
-err_desc_pool_create:
-	free_irq(platform_get_irq(pdev, 0), atdma);
-err_irq:
-	clk_disable_unprepare(atdma->clk);
-	return err;
 }
 
 static void at_dma_remove(struct platform_device *pdev)
@@ -2127,22 +2109,12 @@ static void at_dma_remove(struct platform_device *pdev)
 	struct dma_chan		*chan, *_chan;
 
 	at_dma_off(atdma);
-	if (pdev->dev.of_node)
-		of_dma_controller_free(pdev->dev.of_node);
-	dma_async_device_unregister(&atdma->dma_device);
-
-	dma_pool_destroy(atdma->memset_pool);
-	dma_pool_destroy(atdma->lli_pool);
-	free_irq(platform_get_irq(pdev, 0), atdma);
 
 	list_for_each_entry_safe(chan, _chan, &atdma->dma_device.channels,
 			device_node) {
 		/* Disable interrupts */
 		atc_disable_chan_irq(atdma, chan->chan_id);
-		list_del(&chan->device_node);
 	}
-
-	clk_disable_unprepare(atdma->clk);
 }
 
 static void at_dma_shutdown(struct platform_device *pdev)
-- 
2.55.0