linux-kernel - Re: [PATCH v2 2/2] remoteproc: enhance rproc

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Message-ID: <20230322160537.GB2821487@p14s>
Date:   Wed, 22 Mar 2023 10:05:37 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Tanmay Shah <tanmay.shah@....com>
Cc:     andersson@...nel.org, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org, Tarak Reddy <tarak.reddy@....com>
Subject: Re: [PATCH v2 2/2] remoteproc: enhance rproc_put() for clusters

Hi Tanmay,

On Tue, Mar 21, 2023 at 09:09:36PM -0700, Tanmay Shah wrote:
> This patch enhances rproc_put() to support remoteproc clusters
> with multiple child nodes as in rproc_get_by_phandle().
> 
> Signed-off-by: Tarak Reddy <tarak.reddy@....com>
> Signed-off-by: Tanmay Shah <tanmay.shah@....com>
> ---
>  drivers/remoteproc/remoteproc_core.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index a3e7c8798381..e7e451012615 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -2560,6 +2560,19 @@ EXPORT_SYMBOL(rproc_free);
>  void rproc_put(struct rproc *rproc)
>  {
>  	module_put(rproc->dev.parent->driver->owner);

There is something wrong here - this should have been removed.

> +	struct platform_device *cluster_pdev;
> +
> +	if (rproc->dev.parent) {

This condition is not needed, please remove.

> +		if (rproc->dev.parent->driver) {
> +			module_put(rproc->dev.parent->driver->owner);
> +		} else {
> +			cluster_pdev = of_find_device_by_node(rproc->dev.parent->of_node->parent);
> +			if (cluster_pdev) {
> +				module_put(cluster_pdev->dev.driver->owner);
> +				put_device(&cluster_pdev->dev);
> +			}
> +		}
> +	}

Some in-lined documentation, the way I did in patch 1/2 would be appreciated.
Otherwize I think the above enhancement make sense.

Thanks,
Mathieu

>  	put_device(&rproc->dev);
>  }
>  EXPORT_SYMBOL(rproc_put);
> -- 
> 2.25.1
>