[PATCH 4/5] net: xilinx: fix a leaked reference by adding missing of_node_put

[Wen Yang]

The call to of_parse_phandle returns a node pointer with refcount
incremented thus it must be explicitly decremented after the last
usage.

Detected by coccinelle with the following warning:
./drivers/net/ethernet/xilinx/xilinx_axienet_main.c:1624:1-7: ERROR: missing 
of_node_put; acquired a node pointer with refcount incremented on line 1569, 
but without a corresponding object release within this function.

Signed-off-by: Wen Yang <wen.yan...@zte.com.cn>
Cc: Anirudha Sarangi <anir...@xilinx.com>
Cc: John Linn <john.l...@xilinx.com>
Cc: "David S. Miller" <da...@davemloft.net>
Cc: Michal Simek <michal.si...@xilinx.com>
Cc: netdev@vger.kernel.org
Cc: linux-arm-ker...@lists.infradead.org
Cc: linux-ker...@vger.kernel.org
---
 drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c 
b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
index 0789d8a..8335390 100644
--- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
@@ -1575,11 +1575,13 @@ static int axienet_probe(struct platform_device *pdev)
        ret = of_address_to_resource(np, 0, &dmares);
        if (ret) {
                dev_err(&pdev->dev, "unable to get DMA resource\n");
+               of_node_put(np);
                goto free_netdev;
        }
        lp->dma_regs = devm_ioremap_resource(&pdev->dev, &dmares);
        if (IS_ERR(lp->dma_regs)) {
                dev_err(&pdev->dev, "could not map DMA regs\n");
+               of_node_put(np);
                ret = PTR_ERR(lp->dma_regs);
                goto free_netdev;
        }
-- 
2.9.5