usb: dwc3: fix possible NULL pointer dereference for rockchip plat

Change-Id: I2afb1fa38ae6e76b8db397bda59fd9fbafe9a53b
Signed-off-by: Wu Liang feng <wulf@rock-chips.com>

diff --git a/drivers/usb/dwc3/dwc3-rockchip.c b/drivers/usb/dwc3/dwc3-rockchip.c
index b188514435367aa70df0136ec1f44c058c9bbc33..744e0e1712735e927ca82786266b4d6cc0ff3eb7 100644 (file)
--- a/drivers/usb/dwc3/dwc3-rockchip.c
+++ b/drivers/usb/dwc3/dwc3-rockchip.c
@@ -80,6 +80,9 @@ static void dwc3_rockchip_otg_extcon_evt_work(struct work_struct *work)
        int                     ret;
        u32                     reg;
 
+       if (!dwc)
+               return;
+
        if (extcon_get_cable_state_(edev, EXTCON_USB) > 0) {
                if (dwc->connected)
                        return;
@@ -318,6 +321,11 @@ static int dwc3_rockchip_probe(struct platform_device *pdev)
        }
 
        rockchip->dwc = platform_get_drvdata(child_pdev);
+       if (!rockchip->dwc) {
+               dev_err(dev, "failed to get drvdata dwc3\n");
+               ret = -ENODEV;
+               goto err3;
+       }
 
        if (rockchip->edev) {
                pm_runtime_set_autosuspend_delay(&child_pdev->dev,