[PATCH 01/11] usb: mtu3: check return value of devm_extcon_register_notifier()

[Chunfeng Yun]

Check the return value of devm_extcon_register_notifier() and
add error handling.

Signed-off-by: Chunfeng Yun <chunfeng....@mediatek.com>
---
 drivers/usb/mtu3/mtu3_dr.c   | 13 +++++++++----
 drivers/usb/mtu3/mtu3_plat.c |  8 +++++++-
 2 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/mtu3/mtu3_dr.c b/drivers/usb/mtu3/mtu3_dr.c
index ac60e9c8564e..61694c40e101 100644
--- a/drivers/usb/mtu3/mtu3_dr.c
+++ b/drivers/usb/mtu3/mtu3_dr.c
@@ -238,14 +238,18 @@ static int ssusb_extcon_register(struct otg_switch_mtk 
*otg_sx)
        otg_sx->vbus_nb.notifier_call = ssusb_vbus_notifier;
        ret = devm_extcon_register_notifier(ssusb->dev, edev, EXTCON_USB,
                                        &otg_sx->vbus_nb);
-       if (ret < 0)
+       if (ret < 0) {
                dev_err(ssusb->dev, "failed to register notifier for USB\n");
+               return ret;
+       }
 
        otg_sx->id_nb.notifier_call = ssusb_id_notifier;
        ret = devm_extcon_register_notifier(ssusb->dev, edev, EXTCON_USB_HOST,
                                        &otg_sx->id_nb);
-       if (ret < 0)
+       if (ret < 0) {
                dev_err(ssusb->dev, "failed to register notifier for 
USB-HOST\n");
+               return ret;
+       }
 
        dev_dbg(ssusb->dev, "EXTCON_USB: %d, EXTCON_USB_HOST: %d\n",
                extcon_get_state(edev, EXTCON_USB),
@@ -415,6 +419,7 @@ void ssusb_set_force_mode(struct ssusb_mtk *ssusb,
 int ssusb_otg_switch_init(struct ssusb_mtk *ssusb)
 {
        struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
+       int ret = 0;
 
        INIT_WORK(&otg_sx->id_work, ssusb_id_work);
        INIT_WORK(&otg_sx->vbus_work, ssusb_vbus_work);
@@ -422,9 +427,9 @@ int ssusb_otg_switch_init(struct ssusb_mtk *ssusb)
        if (otg_sx->manual_drd_enabled)
                ssusb_debugfs_init(ssusb);
        else
-               ssusb_extcon_register(otg_sx);
+               ret = ssusb_extcon_register(otg_sx);
 
-       return 0;
+       return ret;
 }
 
 void ssusb_otg_switch_exit(struct ssusb_mtk *ssusb)
diff --git a/drivers/usb/mtu3/mtu3_plat.c b/drivers/usb/mtu3/mtu3_plat.c
index e086630e41a9..dee31d5eefe1 100644
--- a/drivers/usb/mtu3/mtu3_plat.c
+++ b/drivers/usb/mtu3/mtu3_plat.c
@@ -401,7 +401,11 @@ static int mtu3_probe(struct platform_device *pdev)
                        goto gadget_exit;
                }
 
-               ssusb_otg_switch_init(ssusb);
+               ret = ssusb_otg_switch_init(ssusb);
+               if (ret) {
+                       dev_err(dev, "failed to initialize switch\n");
+                       goto host_exit;
+               }
                break;
        default:
                dev_err(dev, "unsupported mode: %d\n", ssusb->dr_mode);
@@ -411,6 +415,8 @@ static int mtu3_probe(struct platform_device *pdev)
 
        return 0;
 
+host_exit:
+       ssusb_host_exit(ssusb);
 gadget_exit:
        ssusb_gadget_exit(ssusb);
 comm_exit:
-- 
2.20.1