Re: [PATCHv3] dmaengine: at_hdmac: use devm APIs in probe()

On Mon, Aug 17, 2026 at 01:12:00PM -0700, Rosen Penev wrote:
> Convert resource allocation and setup in probe() to use devm-managed APIs.
> Simplify the error handling path and removes explicit cleanup code.
>
> Assisted-by: opencode:big-pickle
> Signed-off-by: Rosen Penev <[email protected]>
> ---

Reviewed-by: Frank Li <[email protected]>

>  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
>