linux-kernel - [PATCH] usb: gadget: udc: core: Warn about failed to find udc

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Date:   Sat,  4 Jan 2020 19:28:36 +0800
From:   Dejin Zheng <zhengdejin5@...il.com>
To:     balbi@...nel.org, gregkh@...uxfoundation.org,
        stern@...land.harvard.edu, rogerq@...com
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Dejin Zheng <zhengdejin5@...il.com>
Subject: [PATCH] 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 class driver because it silently fails.
Let's print a warning in that case so developers find
these problems faster.

Signed-off-by: Dejin Zheng <zhengdejin5@...il.com>
---
 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