linux-kernel - Re: [PATCH] pci/hotplug/pnv-php: Remove probable double put

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Message-ID: <20210907112405.GA722145@bjorn-Precision-5520>
Date:   Tue, 7 Sep 2021 06:24:05 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Xu Wang <vulab@...as.ac.cn>
Cc:     mpe@...erman.id.au, benh@...nel.crashing.org, paulus@...ba.org,
        bhelgaas@...gle.com, linuxppc-dev@...ts.ozlabs.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pci/hotplug/pnv-php: Remove probable double put

Make your subject line follow the previous convention.

Figure out if this is a "probable" or a real double put.  If it's a
real double put, we should fix it.  If it's only "probable," that
means we don't understand the problem yet.

On Tue, Sep 07, 2021 at 08:59:46AM +0000, Xu Wang wrote:
> Device node iterators put the previous value of the index variable,
> so an explicit put causes a double put.
> 
> Signed-off-by: Xu Wang <vulab@...as.ac.cn>
> ---
>  drivers/pci/hotplug/pnv_php.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/pci/hotplug/pnv_php.c b/drivers/pci/hotplug/pnv_php.c
> index 04565162a449..ed4d1a2c3f22 100644
> --- a/drivers/pci/hotplug/pnv_php.c
> +++ b/drivers/pci/hotplug/pnv_php.c
> @@ -158,7 +158,6 @@ static void pnv_php_detach_device_nodes(struct device_node *parent)
>  	for_each_child_of_node(parent, dn) {
>  		pnv_php_detach_device_nodes(dn);
>  
> -		of_node_put(dn);
>  		of_detach_node(dn);
>  	}
>  }
> -- 
> 2.17.1
>