Re: [PATCHv2 2/2] dmaengine: fsl_raid: free resources in probe

[Frank Li <Frank.li@oss.nxp.com>]

On Tue, Jul 21, 2026 at 12:54:22PM -0700, Rosen Penev wrote:
> Add free_irq() in the error unwind of fsl_re_chan_probe() and in
> fsl_re_remove_chan() so the interrupt is always released.
>
> Also add tasklet_kill(). Present in _remove but not _probe.
>
> Also add platform_device_put on failure as of_platform_device_create()
> increases the reference count and needs platform_device_put on failure.
> Requires placing the pointer in the struct for the _remove function.
> While at it, use platform_get/set_drvdata as there's no need for using a
> device pointer for that.
>
> Fixes: ad80da658bbc ("dmaengine: Driver support for FSL RaidEngine device.")
> Assisted-by: opencode:hy3-free
> Signed-off-by: Rosen Penev <rosenp@gmail.com>
> ---
>  drivers/dma/fsl_raid.c | 20 ++++++++++++++------
>  drivers/dma/fsl_raid.h |  1 +
>  2 files changed, 15 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/dma/fsl_raid.c b/drivers/dma/fsl_raid.c
> index 2d54879cd6e1..cabc79e61e85 100644
> --- a/drivers/dma/fsl_raid.c
> +++ b/drivers/dma/fsl_raid.c
> @@ -661,8 +661,7 @@ static int fsl_re_chan_probe(struct platform_device *ofdev,
>  	chan_ofdev = of_platform_device_create(np, NULL, dev);
>  	if (!chan_ofdev) {
>  		dev_err(dev, "Not able to create ofdev for jr %d\n", q);
> -		ret = -EINVAL;
> -		goto err_free;
> +		return -EINVAL;
>  	}
>
>  	/* read reg property from dts */
> @@ -688,17 +687,19 @@ static int fsl_re_chan_probe(struct platform_device *ofdev,
>  	chandev = &chan_ofdev->dev;
>  	tasklet_setup(&chan->irqtask, fsl_re_dequeue);
>
> +	platform_set_drvdata(chan_ofdev, chan);

Previous patch already set, why need set again?

Frank
>  	ret = request_irq(chan->irq, fsl_re_isr, 0, chan->name, chan_ofdev);
>  	if (ret) {
>  		dev_err(dev, "Unable to register interrupt for JR %d\n", q);
>  		ret = -EINVAL;
> -		goto err_free;
> +		goto err_free_tasklet;
>  	}
>
>  	re_priv->re_jrs[q] = chan;
>  	chan->chan.device = dma_dev;
>  	chan->chan.private = chan;
>  	chan->dev = chandev;
> +	chan->ofdev = chan_ofdev;
>  	chan->re_dev = re_priv;
>
>  	spin_lock_init(&chan->desc_lock);
> @@ -712,7 +713,7 @@ static int fsl_re_chan_probe(struct platform_device *ofdev,
>  	if (!chan->inb_ring_virt_addr) {
>  		dev_err(dev, "No dma memory for inb_ring_virt_addr\n");
>  		ret = -ENOMEM;
> -		goto err_free;
> +		goto err_free_irq;
>  	}
>
>  	chan->oub_ring_virt_addr = dma_pool_alloc(chan->re_dev->hw_desc_pool,
> @@ -744,8 +745,6 @@ static int fsl_re_chan_probe(struct platform_device *ofdev,
>  	out_be32(&chan->jrregs->jr_config_1,
>  		 FSL_RE_CFG1_CBSI | FSL_RE_CFG1_CBS0 | status);
>
> -	platform_set_drvdata(chan_ofdev, chan);
> -
>  	/* Enable RE/CHAN */
>  	out_be32(&chan->jrregs->jr_command, FSL_RE_ENABLE);
>
> @@ -754,7 +753,12 @@ static int fsl_re_chan_probe(struct platform_device *ofdev,
>  err_free_1:
>  	dma_pool_free(chan->re_dev->hw_desc_pool, chan->inb_ring_virt_addr,
>  		      chan->inb_phys_addr);
> +err_free_irq:
> +	free_irq(chan->irq, chan_ofdev);
> +err_free_tasklet:
> +	tasklet_kill(&chan->irqtask);
>  err_free:
> +	of_platform_device_destroy(chan_ofdev);
>  	return ret;
>  }
>
> @@ -892,6 +896,8 @@ static int fsl_re_probe(struct platform_device *ofdev)
>
>  static void fsl_re_remove_chan(struct fsl_re_chan *chan)
>  {
> +	free_irq(chan->irq, chan->ofdev);
> +
>  	tasklet_kill(&chan->irqtask);
>
>  	dma_pool_free(chan->re_dev->hw_desc_pool, chan->inb_ring_virt_addr,
> @@ -899,6 +905,8 @@ static void fsl_re_remove_chan(struct fsl_re_chan *chan)
>
>  	dma_pool_free(chan->re_dev->hw_desc_pool, chan->oub_ring_virt_addr,
>  		      chan->oub_phys_addr);
> +
> +	of_platform_device_destroy(chan->ofdev);
>  }
>
>  static void fsl_re_remove(struct platform_device *ofdev)
> diff --git a/drivers/dma/fsl_raid.h b/drivers/dma/fsl_raid.h
> index adbfede330a7..34d362803610 100644
> --- a/drivers/dma/fsl_raid.h
> +++ b/drivers/dma/fsl_raid.h
> @@ -270,6 +270,7 @@ struct fsl_re_chan {
>  	struct list_head active_q; /* already issued on hw, not completed */
>  	struct list_head submit_q;
>  	struct list_head free_q; /* alloc available queue */
> +	struct platform_device *ofdev;
>  	struct device *dev;
>  	struct fsl_re_drv_private *re_dev;
>  	struct dma_chan chan;
> --
> 2.55.0
>