linux-kernel - Re: [PATCH 07/11] dmaengine: imx-sdma: make use of dev_err

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Message-ID: <aLhZFv27bFh64MrD@lizhi-Precision-Tower-5810>
Date: Wed, 3 Sep 2025 11:04:54 -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 07/11] dmaengine: imx-sdma: make use of dev_err_probe()

On Wed, Sep 03, 2025 at 03:06:15PM +0200, Marco Felsch wrote:
> Convert the probe function to dev_err_probe() which helps users to
> identify issues better.

I think it is not "convert"

Add dev_err_probe() at return path of probe to help user to ...

Reviewed-by: Frank Li <Frank.Li@....com>
>
> Signed-off-by: Marco Felsch <m.felsch@...gutronix.de>
> ---
>  drivers/dma/imx-sdma.c | 28 ++++++++++++----------------
>  1 file changed, 12 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
> index f6bb2f88a62781c0431336c365fa30c46f1401ad..e30dd46cf6522ee2aa4d3aca9868a01afbd29615 100644
> --- a/drivers/dma/imx-sdma.c
> +++ b/drivers/dma/imx-sdma.c
> @@ -2255,7 +2255,7 @@ static int sdma_probe(struct platform_device *pdev)
>
>  	ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
>  	if (ret)
> -		return ret;
> +		return dev_err_probe(dev, ret, "Failed to set DMA mask\n");
>
>  	sdma = devm_kzalloc(dev, sizeof(*sdma), GFP_KERNEL);
>  	if (!sdma)
> @@ -2272,24 +2272,24 @@ static int sdma_probe(struct platform_device *pdev)
>
>  	irq = platform_get_irq(pdev, 0);
>  	if (irq < 0)
> -		return irq;
> +		return dev_err_probe(dev, irq, "Failed to get IRQ\n");
>
>  	sdma->regs = devm_platform_ioremap_resource(pdev, 0);
>  	if (IS_ERR(sdma->regs))
> -		return PTR_ERR(sdma->regs);
> +		return dev_err_probe(dev, PTR_ERR(sdma->regs), "ioremap failed\n");
>
>  	sdma->clk_ipg = devm_clk_get_prepared(dev, "ipg");
>  	if (IS_ERR(sdma->clk_ipg))
> -		return PTR_ERR(sdma->clk_ipg);
> +		return dev_err_probe(dev, PTR_ERR(sdma->clk_ipg), "IPG clk_get_prepared failed\n");
>
>  	sdma->clk_ahb = devm_clk_get_prepared(dev, "ahb");
>  	if (IS_ERR(sdma->clk_ahb))
> -		return PTR_ERR(sdma->clk_ahb);
> +		return dev_err_probe(dev, PTR_ERR(sdma->clk_ahb), "AHB clk_get_prepared failed\n");
>
>  	ret = devm_request_irq(dev, irq, sdma_int_handler, 0,
>  			       dev_name(dev), sdma);
>  	if (ret)
> -		return ret;
> +		return dev_err_probe(dev, ret, "Failed to request IRQ\n");
>
>  	sdma->irq = irq;
>
> @@ -2330,11 +2330,11 @@ static int sdma_probe(struct platform_device *pdev)
>
>  	ret = sdma_init(sdma);
>  	if (ret)
> -		return ret;
> +		return dev_err_probe(dev, ret, "sdma_init failed\n");
>
>  	ret = sdma_event_remap(sdma);
>  	if (ret)
> -		return ret;
> +		return dev_err_probe(dev, ret, "sdma_event_remap failed\n");
>
>  	if (sdma->drvdata->script_addrs)
>  		sdma_add_scripts(sdma, sdma->drvdata->script_addrs);
> @@ -2361,18 +2361,14 @@ static int sdma_probe(struct platform_device *pdev)
>  	platform_set_drvdata(pdev, sdma);
>
>  	ret = dma_async_device_register(&sdma->dma_device);
> -	if (ret) {
> -		dev_err(dev, "unable to register\n");
> -		return ret;
> -	}
> +	if (ret)
> +		return dev_err_probe(dev, ret, "unable to register\n");
>
>  	devm_add_action_or_reset(dev, sdma_dma_device_unregister_action, sdma);
>
>  	ret = of_dma_controller_register(np, sdma_xlate, sdma);
> -	if (ret) {
> -		dev_err(dev, "failed to register controller\n");
> -		return ret;
> -	}
> +	if (ret)
> +		return dev_err_probe(dev, ret, "failed to register controller\n");
>
>  	spba_bus = of_find_compatible_node(NULL, NULL, "fsl,spba-bus");
>  	ret = of_address_to_resource(spba_bus, 0, &spba_res);
>
> --
> 2.47.2
>