linux-kernel - Re: [PATCH v3] dmaengine: mxs: fix driver registering

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Message-ID: <Yqs3E0ipEpsCT2T2@matsya>
Date:   Thu, 16 Jun 2022 06:58:43 -0700
From:   Vinod Koul <vkoul@...nel.org>
To:     Dario Binacchi <dario.binacchi@...rulasolutions.com>
Cc:     linux-kernel@...r.kernel.org, linux-amarula@...rulasolutions.com,
        Michael Trimarchi <michael@...rulasolutions.com>,
        stable@...r.kernel.org, Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>, dmaengine@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3] dmaengine: mxs: fix driver registering

On 14-06-22, 12:17, Dario Binacchi wrote:
> Driver registration fails on SOC imx8mn as its supplier, the clock
> control module, is not ready. Since platform_driver_probe(), as
> reported by its description, is incompatible with deferred probing,
> we have to use platform_driver_register().
> 
> Fixes: a580b8c5429a ("dmaengine: mxs-dma: add dma support for i.MX23/28")
> Co-developed-by: Michael Trimarchi <michael@...rulasolutions.com>
> Signed-off-by: Michael Trimarchi <michael@...rulasolutions.com>
> Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>
> Cc: stable@...r.kernel.org
> 
> ---
> 
> Changes in v3:
> - Restore __init in front of mxs_dma_init() definition.
> 
> Changes in v2:
> - Add the tag "Cc: stable@...r.kernel.org" in the sign-off area.
> 
>  drivers/dma/mxs-dma.c | 9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/dma/mxs-dma.c b/drivers/dma/mxs-dma.c
> index 994fc4d2aca4..6e90540fedc4 100644
> --- a/drivers/dma/mxs-dma.c
> +++ b/drivers/dma/mxs-dma.c
> @@ -741,7 +741,7 @@ static struct dma_chan *mxs_dma_xlate(struct of_phandle_args *dma_spec,
>  				     ofdma->of_node);
>  }
>  
> -static int __init mxs_dma_probe(struct platform_device *pdev)
> +static int mxs_dma_probe(struct platform_device *pdev)

why drop __init here, if there is a reason for that please split this
change and document such reason...

>  {
>  	struct device_node *np = pdev->dev.of_node;
>  	const struct mxs_dma_type *dma_type;
> @@ -839,10 +839,7 @@ static struct platform_driver mxs_dma_driver = {
>  		.name	= "mxs-dma",
>  		.of_match_table = mxs_dma_dt_ids,
>  	},
> +	.probe = mxs_dma_probe,
>  };
>  
> -static int __init mxs_dma_module_init(void)
> -{
> -	return platform_driver_probe(&mxs_dma_driver, mxs_dma_probe);
> -}
> -subsys_initcall(mxs_dma_module_init);
> +module_platform_driver(mxs_dma_driver);
> -- 
> 2.32.0

-- 
~Vinod