Re: [PATCHv4] dmaengine: ppc4xx: convert irq_of_parse_and_map to platform_get_irq

[Frank Li]

On Tue, Sep 15, 2026 at 12:20:26AM -0700, Rosen Penev wrote:
> Replace irq_of_parse_and_map() with platform_get_irq(), which is the
> preferred way to obtain IRQ resources from platform devices.  This
> eliminates the corresponding irq_dispose_mapping() calls since the
> framework manages the mapping. Also allows dealing with -EPROBE_DEFER.
>
> While here, fix a latent bug in the err_req2 error path: the error IRQ
> was not freed when a subsequent step (I2O setup) failed.
>
> The struct device_node *np declaration is moved to the scope where
> it is still needed (I2O register lookup).
>
> Assisted-by: opencode:big-pickle
> Signed-off-by: Rosen Penev <rosenp@xxxxxxxxx>
> ---

Reviewed-by: Frank Li <Frank.Li@xxxxxxx>

>  v4: handle -EPROBE_DEFER
>  v3: use _optional
>  v2: fix missing free_irq in remove and fix description
>  drivers/dma/ppc4xx/adma.c | 39 ++++++++++++++++++---------------------
>  1 file changed, 18 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/dma/ppc4xx/adma.c b/drivers/dma/ppc4xx/adma.c
> index 279a431ccae3..0b4ba9a2fe88 100644
> --- a/drivers/dma/ppc4xx/adma.c
> +++ b/drivers/dma/ppc4xx/adma.c
> @@ -3865,28 +3865,28 @@ static int ppc440spe_adma_setup_irqs(struct ppc440spe_adma_device *adev,
>  				     int *initcode)
>  {
>  	struct platform_device *ofdev;
> -	struct device_node *np;
>  	int ret;
>
>  	ofdev = container_of(adev->dev, struct platform_device, dev);
> -	np = ofdev->dev.of_node;
>  	if (adev->id != PPC440SPE_XOR_ID) {
> -		adev->err_irq = irq_of_parse_and_map(np, 1);
> -		if (!adev->err_irq) {
> +		adev->err_irq = platform_get_irq_optional(ofdev, 1);
> +		if (adev->err_irq == -EPROBE_DEFER) {
> +			ret = adev->err_irq;
> +			goto err_irq_map;
> +		}
> +		if (adev->err_irq <= 0) {
>  			dev_warn(adev->dev, "no err irq resource?\n");
>  			*initcode = PPC_ADMA_INIT_IRQ2;
> -			adev->err_irq = -ENXIO;
>  		} else
>  			atomic_inc(&ppc440spe_adma_err_irq_ref);
>  	} else {
>  		adev->err_irq = -ENXIO;
>  	}
>
> -	adev->irq = irq_of_parse_and_map(np, 0);
> -	if (!adev->irq) {
> -		dev_err(adev->dev, "no irq resource\n");
> +	adev->irq = platform_get_irq(ofdev, 0);
> +	if (adev->irq < 0) {
>  		*initcode = PPC_ADMA_INIT_IRQ1;
> -		ret = -ENXIO;
> +		ret = adev->irq;
>  		goto err_irq_map;
>  	}
>  	dev_dbg(adev->dev, "irq %d, err irq %d\n",
> @@ -3899,7 +3899,7 @@ static int ppc440spe_adma_setup_irqs(struct ppc440spe_adma_device *adev,
>  			adev->irq);
>  		*initcode = PPC_ADMA_INIT_IRQ1;
>  		ret = -EIO;
> -		goto err_req1;
> +		goto err_irq_map;
>  	}
>
>  	/* only DMA engines have a separate error IRQ
> @@ -3917,7 +3917,7 @@ static int ppc440spe_adma_setup_irqs(struct ppc440spe_adma_device *adev,
>  				adev->err_irq);
>  			*initcode = PPC_ADMA_INIT_IRQ2;
>  			ret = -EIO;
> -			goto err_req2;
> +			goto err_req1;
>  		}
>  	}
>
> @@ -3927,6 +3927,7 @@ static int ppc440spe_adma_setup_irqs(struct ppc440spe_adma_device *adev,
>  			    XOR_IE_ICIE_BIT | XOR_IE_RPTIE_BIT,
>  			    &adev->xor_reg->ier);
>  	} else {
> +		struct device_node *np;
>  		u32 mask, enable;
>
>  		np = of_find_compatible_node(NULL, NULL, "ibm,i2o-440spe");
> @@ -3956,14 +3957,13 @@ static int ppc440spe_adma_setup_irqs(struct ppc440spe_adma_device *adev,
>  	return 0;
>
>  err_req2:
> -	free_irq(adev->irq, chan);
> +	if (adev->err_irq > 0)
> +		free_irq(adev->err_irq, chan);
>  err_req1:
> -	irq_dispose_mapping(adev->irq);
> +	free_irq(adev->irq, chan);
>  err_irq_map:
> -	if (adev->err_irq > 0) {
> -		if (atomic_dec_and_test(&ppc440spe_adma_err_irq_ref))
> -			irq_dispose_mapping(adev->err_irq);
> -	}
> +	if (adev->err_irq > 0)
> +		atomic_dec(&ppc440spe_adma_err_irq_ref);
>  	return ret;
>  }
>
> @@ -3987,13 +3987,10 @@ static void ppc440spe_adma_release_irqs(struct ppc440spe_adma_device *adev,
>  		iowrite32(mask, &adev->i2o_reg->iopim);
>  	}
>  	free_irq(adev->irq, chan);
> -	irq_dispose_mapping(adev->irq);
>  	if (adev->err_irq > 0) {
>  		free_irq(adev->err_irq, chan);
> -		if (atomic_dec_and_test(&ppc440spe_adma_err_irq_ref)) {
> -			irq_dispose_mapping(adev->err_irq);
> +		if (atomic_dec_and_test(&ppc440spe_adma_err_irq_ref))
>  			iounmap(adev->i2o_reg);
> -		}
>  	}
>  }
>
> --
> 2.55.0
>