linux-kernel - [PATCH 7/8] PCI: mediatek: fix a leaked reference by adding missing of_node

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Date:   Wed, 27 Feb 2019 12:40:42 +0800
From:   Wen Yang <wen.yang99@....com.cn>
To:     benh@...nel.crashing.org
Cc:     paulus@...ba.org, mpe@...erman.id.au, tyreld@...ux.vnet.ibm.com,
        bhelgaas@...gle.com, linuxppc-dev@...ts.ozlabs.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        ryder.lee@...iatek.com, lorenzo.pieralisi@....com,
        matthias.bgg@...il.com, linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, rjui@...adcom.com,
        sbranden@...adcom.com, bcm-kernel-feedback-list@...adcom.com,
        thomas.petazzoni@...tlin.com, shawn.lin@...k-chips.com,
        heiko@...ech.de, linux-rockchip@...ts.infradead.org,
        minghuan.Lian@....com, mingkai.hu@....com, roy.zang@....com,
        hayashi.kunihiko@...ionext.com, yamada.masahiro@...ionext.com,
        kishon@...com, linux-omap@...r.kernel.org, wang.yi59@....com.cn,
        Wen Yang <wen.yang99@....com.cn>
Subject: [PATCH 7/8] PCI: mediatek: fix a leaked reference by adding missing of_node_put

The call to of_get_next_child returns a node pointer with refcount
incremented thus it must be explicitly decremented after the last
usage.
irq_domain_add_linear also calls of_node_get to increase refcount,
so irq_domain will not be affected when it is released.

Detected by coccinelle with the following warnings:
./drivers/pci/controller/pcie-mediatek.c:577:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 567, but without a corresponding object release within this function.
./drivers/pci/controller/pcie-mediatek.c:583:3-9: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 567, but without a corresponding object release within this function.
./drivers/pci/controller/pcie-mediatek.c:586:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 567, but without a corresponding object release within this function.

Signed-off-by: Wen Yang <wen.yang99@....com.cn>
Cc: Ryder Lee <ryder.lee@...iatek.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Matthias Brugger <matthias.bgg@...il.com>
Cc: linux-pci@...r.kernel.org
Cc: linux-mediatek@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org
---
 drivers/pci/controller/pcie-mediatek.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
index 55e471c..e91716a 100644
--- a/drivers/pci/controller/pcie-mediatek.c
+++ b/drivers/pci/controller/pcie-mediatek.c
@@ -572,6 +572,7 @@ static int mtk_pcie_init_irq_domain(struct mtk_pcie_port *port,

 	port->irq_domain = irq_domain_add_linear(pcie_intc_node, PCI_NUM_INTX,
 						 &intx_domain_ops, port);
+	of_node_put(pcie_intc_node);
 	if (!port->irq_domain) {
 		dev_err(dev, "failed to get INTx IRQ domain\n");
 		return -ENODEV;
-- 
2.9.5