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From:   Dejin Zheng <zhengdejin5@gmail.com>
To:     balbi@kernel.org, gregkh@linuxfoundation.org,
        stern@rowland.harvard.edu, rogerq@ti.com
Cc:     linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
        Dejin Zheng <zhengdejin5@gmail.com>
Subject: [PATCH v2] usb: gadget: udc: core: Warn about failed to find udc
Date:   Sat,  4 Jan 2020 21:27:40 +0800
Message-Id: <20200104132740.29055-1-zhengdejin5@gmail.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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>
---

V2: fix some mistake in comments.

 drivers/usb/gadget/udc/core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c
index 51fa614b4079..9b11046480fe 100644
--- 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);
-- 
2.17.1