linux-kernel - Re: [PATCH v3 2/2] remoteproc: enhance rproc

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Date:   Wed, 5 Apr 2023 11:05:22 -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, kernel test robot <lkp@...el.com>,
        Tarak Reddy <tarak.reddy@....com>
Subject: Re: [PATCH v3 2/2] remoteproc: enhance rproc_put() for clusters

On Tue, Mar 28, 2023 at 09:49:24AM -0700, Tanmay Shah wrote:
> This patch enhances rproc_put() to support remoteproc clusters
> with multiple child nodes as in rproc_get_by_phandle().
> 
> Reported-by: kernel test robot <lkp@...el.com>
> Link: https://lore.kernel.org/oe-kbuild-all/202303221441.cuBnpvye-lkp@intel.com/
> Signed-off-by: Tarak Reddy <tarak.reddy@....com>
> Signed-off-by: Tanmay Shah <tanmay.shah@....com>
> ---
> 
> Changes in v3:
>   - remove module_put call that was introduced in the patch by mistake
>   - remove redundant check in rproc_put
>   - Add inline comments in rproc_put that explains functionality
> 
> Changes in v2:
>   - Introduce this patch to fix rproc_put as per modified rproc_get_by_phandle
> 
>  drivers/remoteproc/remoteproc_core.c | 17 ++++++++++++++++-
>  1 file changed, 16 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index a3e7c8798381..d8f28c6fe3a3 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -2559,7 +2559,22 @@ EXPORT_SYMBOL(rproc_free);
>   */
>  void rproc_put(struct rproc *rproc)
>  {
> -	module_put(rproc->dev.parent->driver->owner);
> +	struct platform_device *cluster_pdev;
> +
> +	if (rproc->dev.parent->driver) {
> +		module_put(rproc->dev.parent->driver->owner);
> +	} else {
> +		/*
> +		 * If the remoteproc's parent does not have a driver,
> +		 * driver is associated with the cluster.
> +		 */
> +		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);
> +		}
> +	}
> +

This looks good to me now.

Bjorn, please have a look at this set when you have a minute.

Thanks,
Mathieu

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