usb: gadget: udc: core: Warn about failed to find udc

If we do not warn here, the user may not know failed to
find udc device by a gadget driver with the same name
because it silently fails. Let's print a warning in that
case so developers find these problems faster.

Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c
index 51fa614b40794310e3216f5b086442d969b5b3be..9b11046480fed72af4e28bd8529dc9c3bbe20500 100644 (file)
--- a/drivers/usb/gadget/udc/core.c
+++ b/drivers/usb/gadget/udc/core.c
@@ -1414,6 +1414,8 @@ int usb_gadget_probe_driver(struct usb_gadget_driver *driver)
        }
 
        mutex_unlock(&udc_lock);
+       if (ret)
+               pr_warn("udc-core: couldn't find an available UDC or it's busy\n");
        return ret;
 found:
        ret = udc_bind_to_driver(udc, driver);