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

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Message-ID: <20250912152809.nj3yk5wmrb7ojjoo@pengutronix.de>
Date: Fri, 12 Sep 2025 17:28:09 +0200
From: Marco Felsch <m.felsch@...gutronix.de>
To: Frank Li <Frank.li@....com>
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 25-09-12, Frank Li wrote:
> 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()

Please check my last patch.

Regards,
  Marco

> 
> 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
> >
>