linux-kernel - [PATCH 3.2 093/185] usb: dwc3: fix implementation of endpoint wedge

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Message-ID: <lsq.1388282924.675755596@decadent.org.uk>
Date:	Sun, 29 Dec 2013 03:08:44 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Pratyush Anand" <pratyush.anand@...com>,
	"Felipe Balbi" <balbi@...com>,
	"Alan Stern" <stern@...land.harvard.edu>
Subject: [PATCH 3.2 093/185] usb: dwc3: fix implementation of endpoint wedge

3.2.54-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Alan Stern <stern@...land.harvard.edu>

commit a535d81c92615b8ffb99b7e1fd1fb01effaed1af upstream.

The dwc3 UDC driver doesn't implement endpoint wedging correctly.
When an endpoint is wedged, the gadget driver should be allowed to
clear the wedge by calling usb_ep_clear_halt().  Only the host is
prevented from resetting the endpoint.

This patch fixes the implementation.

Signed-off-by: Alan Stern <stern@...land.harvard.edu>
Tested-by: Pratyush Anand <pratyush.anand@...com>
Signed-off-by: Felipe Balbi <balbi@...com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/dwc3/ep0.c    | 2 ++
 drivers/usb/dwc3/gadget.c | 5 +----
 2 files changed, 3 insertions(+), 4 deletions(-)

--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -394,6 +394,8 @@ static int dwc3_ep0_handle_feature(struc
 			dep =  dwc3_wIndex_to_dep(dwc, ctrl->wIndex);
 			if (!dep)
 				return -EINVAL;
+			if (set == 0 && (dep->flags & DWC3_EP_WEDGE))
+				break;
 			ret = __dwc3_gadget_ep_set_halt(dep, set);
 			if (ret)
 				return -EINVAL;
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -903,9 +903,6 @@ int __dwc3_gadget_ep_set_halt(struct dwc
 		else
 			dep->flags |= DWC3_EP_STALL;
 	} else {
-		if (dep->flags & DWC3_EP_WEDGE)
-			return 0;
-
 		ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
 			DWC3_DEPCMD_CLEARSTALL, &params);
 		if (ret)
@@ -913,7 +910,7 @@ int __dwc3_gadget_ep_set_halt(struct dwc
 					value ? "set" : "clear",
 					dep->name);
 		else
-			dep->flags &= ~DWC3_EP_STALL;
+			dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE);
 	}
 
 	return ret;

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