linux-kernel - Re: [PATCH v2 09/10] dmaengine: imx-sdma: make use of devm_add_action_or

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Message-ID: <aMQzNDE8QuUZwGkt@lizhi-Precision-Tower-5810>
Date: Fri, 12 Sep 2025 10:50:28 -0400
From: Frank Li <Frank.li@....com>
To: Marco Felsch <m.felsch@...gutronix.de>
Cc: Vinod Koul <vkoul@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Jiada Wang <jiada_wang@...tor.com>, dmaengine@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 09/10] dmaengine: imx-sdma: make use of
 devm_add_action_or_reset to unregiser the dma-controller

On Thu, Sep 11, 2025 at 11:56:50PM +0200, Marco Felsch wrote:
> Use the devres capabilities to cleanup the driver remove() callback.
>
> Signed-off-by: Marco Felsch <m.felsch@...gutronix.de>
> ---
>  drivers/dma/imx-sdma.c | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
> index d6d0d4300f540268a3ab4a6b14af685f7b93275a..a7e6554ca223e2e980caf2e2dea832db9ad60ed6 100644
> --- a/drivers/dma/imx-sdma.c
> +++ b/drivers/dma/imx-sdma.c
> @@ -2264,6 +2264,13 @@ static struct dma_chan *sdma_xlate(struct of_phandle_args *dma_spec,
>  				     ofdma->of_node);
>  }
>
> +static void sdma_dma_of_dma_controller_unregister_action(void *data)
> +{
> +	struct sdma_engine *sdma = data;
> +
> +	of_dma_controller_free(sdma->dev->of_node);
> +}
> +
>  static void sdma_dma_device_unregister_action(void *data)
>  {
>  	struct sdma_engine *sdma = data;
> @@ -2408,6 +2415,12 @@ static int sdma_probe(struct platform_device *pdev)
>  		return ret;
>  	}
>
> +	ret = devm_add_action_or_reset(dev, sdma_dma_of_dma_controller_unregister_action, sdma);
> +	if (ret) {
> +		dev_err(dev, "failed to register of-dma-controller unregister hook\n");
> +		return ret;
> +	}
> +

return dev_err_probe()

Frank
>  	/*
>  	 * Because that device tree does not encode ROM script address,
>  	 * the RAM script in firmware is mandatory for device tree
> @@ -2431,7 +2444,6 @@ static void sdma_remove(struct platform_device *pdev)
>  	struct sdma_engine *sdma = platform_get_drvdata(pdev);
>  	int i;
>
> -	of_dma_controller_free(sdma->dev->of_node);
>  	/* Kill the tasklet */
>  	for (i = 0; i < MAX_DMA_CHANNELS; i++) {
>  		struct sdma_channel *sdmac = &sdma->channel[i];
>
> --
> 2.47.3
>