linux-kernel - Re: [PATCH v2 2/4] of/irq: Fix OF node refcount in of_msi_get

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Message-ID: <aO7Mx11tWFbDX8u1@lizhi-Precision-Tower-5810>
Date: Tue, 14 Oct 2025 18:20:55 -0400
From: Frank Li <Frank.li@....com>
To: Lorenzo Pieralisi <lpieralisi@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-pci@...r.kernel.org,
	Rob Herring <robh@...nel.org>,
	Sascha Bischoff <sascha.bischoff@....com>,
	Scott Branden <sbranden@...adcom.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Bjorn Helgaas <bhelgaas@...gle.com>, Ray Jui <rjui@...adcom.com>,
	Manivannan Sadhasivam <mani@...nel.org>,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Marc Zyngier <maz@...nel.org>
Subject: Re: [PATCH v2 2/4] of/irq: Fix OF node refcount in
 of_msi_get_domain()

On Tue, Oct 14, 2025 at 11:58:43AM +0200, Lorenzo Pieralisi wrote:
> In of_msi_get_domain() if the iterator loop stops early because an
> irq_domain match is detected, an of_node_put() on the iterator node is
> needed to keep the OF node refcount in sync.
>
> Add it.
>
> Signed-off-by: Lorenzo Pieralisi <lpieralisi@...nel.org>
> Cc: Rob Herring <robh@...nel.org>
> ---

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

After go though of_for_each_phandle, I understand why need of_node_put()
at break branch.

It will be nice if add of_for_each_phandle_scoped() help macro.


>  drivers/of/irq.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/of/irq.c b/drivers/of/irq.c
> index e67b2041e73b..9f6cd5abba76 100644
> --- a/drivers/of/irq.c
> +++ b/drivers/of/irq.c
> @@ -773,8 +773,10 @@ struct irq_domain *of_msi_get_domain(struct device *dev,
>
>  	of_for_each_phandle(&it, err, np, "msi-parent", "#msi-cells", 0) {
>  		d = irq_find_matching_host(it.node, token);
> -		if (d)
> +		if (d) {
> +			of_node_put(it.node);
>  			return d;
> +		}
>  	}
>
>  	return NULL;
> --
> 2.50.1
>