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From:   Kangjie Lu <kjlu@umn.edu>
To:     kjlu@umn.edu
Cc:     pakki001@umn.edu, Peter Chen <Peter.Chen@nxp.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] usb: chipidea: add a check for the availability of next child
Date:   Tue, 25 Dec 2018 20:01:34 -0600
Message-Id: <20181226020134.71351-1-kjlu@umn.edu>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

of_get_next_available_child returns NULL when no child nodes are found.
The fix checks its return value instead of assuming a child is found.

Signed-off-by: Kangjie Lu <kjlu@umn.edu>
---
 drivers/usb/chipidea/ci_hdrc_msm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/chipidea/ci_hdrc_msm.c b/drivers/usb/chipidea/ci_hdrc_msm.c
index 880009987460..7dc987b4036a 100644
--- a/drivers/usb/chipidea/ci_hdrc_msm.c
+++ b/drivers/usb/chipidea/ci_hdrc_msm.c
@@ -250,6 +250,8 @@ static int ci_hdrc_msm_probe(struct platform_device *pdev)
 	ulpi_node = of_get_child_by_name(pdev->dev.of_node, "ulpi");
 	if (ulpi_node) {
 		phy_node = of_get_next_available_child(ulpi_node, NULL);
+		if (!phy_node)
+			dev_err(&pdev->dev, "no child nodes found\n");
 		ci->hsic = of_device_is_compatible(phy_node, "qcom,usb-hsic-phy");
 		of_node_put(phy_node);
 	}
-- 
2.17.2 (Apple Git-113)