linux-kernel - Re: [PATCH] platform: set of_node in platform_device_register

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Date:   Sun, 17 Feb 2019 22:36:19 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Mans Rullgard <mans@...sr.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] platform: set of_node in platform_device_register_full()

On Sat, Feb 16, 2019 at 5:50 PM Mans Rullgard <mans@...sr.com> wrote:
>
> If the provided fwnode is an OF node, set dev.of_node as well.
>
> Signed-off-by: Mans Rullgard <mans@...sr.com>
> ---
>  drivers/base/platform.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/base/platform.c b/drivers/base/platform.c
> index dff82a3c2caa..853a1d0e5845 100644
> --- a/drivers/base/platform.c
> +++ b/drivers/base/platform.c
> @@ -512,6 +512,7 @@ struct platform_device *platform_device_register_full(
>
>         pdev->dev.parent = pdevinfo->parent;
>         pdev->dev.fwnode = pdevinfo->fwnode;
> +       pdev->dev.of_node = of_node_get(to_of_node(pdev->dev.fwnode));

of_node_get() generally does a kobject_get() on the node's kobject, so
when is that reference dropped?  Or if it doesn't need to be dropped
at all, why is this the case?

>
>         if (pdevinfo->dma_mask) {
>                 /*
> --
> 2.20.1
>