linux-kernel - RE: [PATCH] usb: chipidea: add a check for the availability of next child

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Message-ID: <VI1PR04MB5327E1080FF6010A2FD0807B8BB50@VI1PR04MB5327.eurprd04.prod.outlook.com>
Date:   Wed, 26 Dec 2018 06:46:23 +0000
From:   Peter Chen <peter.chen@....com>
To:     Kangjie Lu <kjlu@....edu>, Loic Poulain <loic.poulain@...aro.org>
CC:     "pakki001@....edu" <pakki001@....edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] usb: chipidea: add a check for the availability of next
 child

 
> Signed-off-by: Kangjie Lu <kjlu@....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);
>  	}

With "ulpi" node, but phy node is not found, I assume the controller can't work properly, we may need to
return error value.  Add loic to confirm.

Peter