linux-kernel - Re: [PATCH] dmaengine: zynqmp_dma: Add shutdown operation support

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Message-ID: <aFENfW0v0gmtY2Gu@vaman>
Date: Tue, 17 Jun 2025 12:08:53 +0530
From: Vinod Koul <vkoul@...nel.org>
To: Abin Joseph <abin.joseph@....com>
Cc: michal.simek@....com, yanzhen@...o.com, radhey.shyam.pandey@....com,
	palmer@...osinc.com, u.kleine-koenig@...libre.com, git@....com,
	dmaengine@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dmaengine: zynqmp_dma: Add shutdown operation support

On 12-06-25, 21:51, Abin Joseph wrote:
> Implement shutdown hook to ensure dmaengine could be stopped inorder for
> kexec to restart the new kernel.
> 
> Signed-off-by: Abin Joseph <abin.joseph@....com>
> ---
>  drivers/dma/xilinx/zynqmp_dma.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/drivers/dma/xilinx/zynqmp_dma.c b/drivers/dma/xilinx/zynqmp_dma.c
> index d05fc5fcc77d..8f9f1ef4f0bf 100644
> --- a/drivers/dma/xilinx/zynqmp_dma.c
> +++ b/drivers/dma/xilinx/zynqmp_dma.c
> @@ -1178,6 +1178,18 @@ static void zynqmp_dma_remove(struct platform_device *pdev)
>  		zynqmp_dma_runtime_suspend(zdev->dev);
>  }
>  
> +/**
> + * zynqmp_dma_shutdown - Driver shutdown function
> + * @pdev: Pointer to the platform_device structure
> + */
> +static void zynqmp_dma_shutdown(struct platform_device *pdev)
> +{
> +	struct zynqmp_dma_device *zdev = platform_get_drvdata(pdev);
> +
> +	zynqmp_dma_chan_remove(zdev->chan);
> +	pm_runtime_disable(zdev->dev);
> +}
> +
>  static const struct of_device_id zynqmp_dma_of_match[] = {
>  	{ .compatible = "amd,versal2-dma-1.0", .data = &versal2_dma_config },
>  	{ .compatible = "xlnx,zynqmp-dma-1.0", },
> @@ -1193,6 +1205,7 @@ static struct platform_driver zynqmp_dma_driver = {
>  	},
>  	.probe = zynqmp_dma_probe,
>  	.remove = zynqmp_dma_remove,
> +	.shutdown = zynqmp_dma_shutdown,

Why not do all operations performed in remove..?

>  };
>  
>  module_platform_driver(zynqmp_dma_driver);
> -- 
> 2.34.1

-- 
~Vinod