linux-kernel - [PATCH] usb: gadget: make usb_ep_enable return -EBUSY if ep has already enabled

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Date:	Fri,  4 Dec 2015 15:24:50 +0800
From:	changbin.du@...el.com
To:	balbi@...com
Cc:	gregkh@...uxfoundation.org, John.Youn@...opsys.com,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Du, Changbin" <changbin.du@...el.com>
Subject: [PATCH] usb: gadget: make usb_ep_enable return -EBUSY if ep has already enabled

From: "Du, Changbin" <changbin.du@...el.com>

When usb_ep_enable on a enabled ep, the configuration of the ep probably
has changed. In this scenario, the ep configuration in hw should be
reprogrammed by udc driver. Hence, it is better to return an error to
inform the caller.

Signed-off-by: Du, Changbin <changbin.du@...el.com>
---
 include/linux/usb/gadget.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index d813bd2..89f9fdd 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -268,7 +268,7 @@ static inline int usb_ep_enable(struct usb_ep *ep)
 	int ret;
 
 	if (ep->enabled)
-		return 0;
+		return -EBUSY;
 
 	ret = ep->ops->enable(ep, ep->desc);
 	if (ret)
-- 
2.5.0

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