linux-kernel - Re: [PATCH] PCI: mediatek-gen3: Fix refcount leak in mtk_pcie_init_irq

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Date:   Mon, 30 May 2022 10:19:23 +0800
From:   Miles Chen <miles.chen@...iatek.com>
To:     <linmq006@...il.com>
CC:     <bhelgaas@...gle.com>, <jianjun.wang@...iatek.com>, <kw@...ux.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <linux-pci@...r.kernel.org>,
        <lorenzo.pieralisi@....com>, <matthias.bgg@...il.com>,
        <maz@...nel.org>, <miles.chen@...iatek.com>, <robh@...nel.org>,
        <ryder.lee@...iatek.com>
Subject: Re: [PATCH] PCI: mediatek-gen3: Fix refcount leak in mtk_pcie_init_irq_domains


Hi Miaoqian,

>>> 						  &intx_domain_ops, pcie);
>>> 	if (!pcie->intx_domain) {
>>> 		dev_err(dev, "failed to create INTx IRQ domain\n");
>>> +		of_node_put(intc_node);
>>> 		return -ENODEV;
>>> 	}
>> Thanks for doing this.
>>
>> I checked mtk_pcie_init_irq_domains() and there are multiple exit paths like
>> err_msi_domain and err_msi_bottom_domain and the normal path which also
>> need of_node_put(intc_node).
>
>Thanks for your reply,
>
>I didn't add of_node_put() in other paths because I am not sure if the reference passed through irq_domain_add_linear(), since intc_node is passed to irq_domain_add_linear().
>
>__irq_domain_add() keeps &node->fwnode in the irq_domain structure.
>
>and use fwnode_handle_get() to get the reference of fwnode, but I still uncertain.
>
>If the reference don't needed anymore after irq_domain_add_linear(),
>
>your suggestion looks fine, and I will submit v2.


Thanks for your reply, I think we can do similar things like
rtl8365mb_irq_setup() in drivers/net/dsa/realtek/rtl8365mb.c

Thanks,
Miles