linux-kernel - Re: [RESEND PATCH] mfd: Add missing of_node

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Date:   Wed, 22 Sep 2021 10:13:07 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Lee Jones <lee.jones@...aro.org>,
        Samuel Ortiz <sameo@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH] mfd: Add missing of_node_put for loop iteration

On 28/05/2021 13:51, Krzysztof Kozlowski wrote:
> Early exits from for_each_child_of_node() should decrement the
> node reference counter.  Reported by Coccinelle:
> 
>   drivers/mfd/mfd-core.c:197:2-24: WARNING:
>     Function "for_each_child_of_node" should have of_node_put() before goto around lines 209.
> 
> Fixes: c94bb233a9fe ("mfd: Make MFD core code Device Tree and IRQ domain aware")
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
> ---
>  drivers/mfd/mfd-core.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c
> index 79f5c6a18815..684a011a6396 100644
> --- a/drivers/mfd/mfd-core.c
> +++ b/drivers/mfd/mfd-core.c
> @@ -198,6 +198,7 @@ static int mfd_add_device(struct device *parent, int id,
>  			if (of_device_is_compatible(np, cell->of_compatible)) {
>  				/* Ignore 'disabled' devices error free */
>  				if (!of_device_is_available(np)) {
> +					of_node_put(np);
>  					ret = 0;
>  					goto fail_alias;
>  				}
> @@ -205,6 +206,7 @@ static int mfd_add_device(struct device *parent, int id,
>  				ret = mfd_match_of_node_to_dev(pdev, np, cell);
>  				if (ret == -EAGAIN)
>  					continue;
> +				of_node_put(np);
>  				if (ret)
>  					goto fail_alias;
>  
> 

Dear Lee,

This was already a resend. Any comments from your side?

Best regards,
Krzysztof