usb: dwc3: rockchip: fix xhci NULL pointer dereference

If DWC3 works as peripheral only mode, XHCI HCD will
not be created and added, so we should only get XHCI
HCD in host mode.

Change-Id: Iefb02431d6a973050986963bbabe0a943283f4b3
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 8a03034675025242f6e1bc886cbf9498ecd5f588..198f67158c3360e9efe382e83aade41c106eacd6 100644 (file)
--- a/drivers/usb/dwc3/dwc3-rockchip.c
+++ b/drivers/usb/dwc3/dwc3-rockchip.c
@@ -81,7 +81,7 @@ static void dwc3_rockchip_otg_extcon_evt_work(struct work_struct *work)
                container_of(work, struct dwc3_rockchip, otg_work);
        struct dwc3             *dwc = rockchip->dwc;
        struct extcon_dev       *edev = rockchip->edev;
-       struct usb_hcd          *hcd = dev_get_drvdata(&dwc->xhci->dev);
+       struct usb_hcd          *hcd;
        unsigned long           flags;
        int                     ret;
        u32                     reg;
@@ -180,6 +180,8 @@ static void dwc3_rockchip_otg_extcon_evt_work(struct work_struct *work)
                 */
                usleep_range(10000, 11000);
 
+               hcd = dev_get_drvdata(&dwc->xhci->dev);
+
                if (hcd->state == HC_STATE_HALT) {
                        usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
                        usb_add_hcd(hcd->shared_hcd, hcd->irq, IRQF_SHARED);