linux-kernel - [PATCH 6/6] usb: gadget: gr_udc: Return error code when trying to set ep.maxpacket > ep.maxpacket

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Date:	Thu,  9 Jan 2014 11:54:18 +0100
From:	Andreas Larsson <andreas@...sler.com>
To:	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Mark Rutland <mark.rutland@....com>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	software@...sler.com
Subject: [PATCH 6/6] usb: gadget: gr_udc: Return error code when trying to set ep.maxpacket > ep.maxpacket_limit

Make gr_ep_enable fail properly when a call requests a larger ep.maxpacket than
ep.maxpacket_limit.

Signed-off-by: Andreas Larsson <andreas@...sler.com>
---
 drivers/usb/gadget/gr_udc.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/gadget/gr_udc.c b/drivers/usb/gadget/gr_udc.c
index 55757fc..5423391 100644
--- a/drivers/usb/gadget/gr_udc.c
+++ b/drivers/usb/gadget/gr_udc.c
@@ -1548,6 +1548,10 @@ static int gr_ep_enable(struct usb_ep *_ep,
 	} else if (max == 0) {
 		dev_err(dev->dev, "Max payload cannot be set to 0\n");
 		return -EINVAL;
+	} else if (max > ep->ep.maxpacket_limit) {
+		dev_err(dev->dev, "Requested max payload %d > limit %d\n",
+			max, ep->ep.maxpacket_limit);
+		return -EINVAL;
 	}
 
 	spin_lock(&ep->dev->lock);
-- 
1.7.10.4

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