[3.5.y.z extended stable] Patch "usb: dwc3: fix implementation of endpoint wedge" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    usb: dwc3: fix implementation of endpoint wedge

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 06db851b56803e385a1cf8abe2f25cd0d2642d9d Mon Sep 17 00:00:00 2001
From: Alan Stern <stern at rowland.harvard.edu>
Date: Fri, 1 Nov 2013 12:05:12 -0400
Subject: usb: dwc3: fix implementation of endpoint wedge

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 at rowland.harvard.edu>
Tested-by: Pratyush Anand <pratyush.anand at st.com>
Signed-off-by: Felipe Balbi <balbi at ti.com>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/usb/dwc3/ep0.c    | 2 ++
 drivers/usb/dwc3/gadget.c | 5 +----
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
index 127551c..3fa1d5e 100644
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -404,6 +404,8 @@ static int dwc3_ep0_handle_feature(struct dwc3 *dwc,
 			dep = dwc3_wIndex_to_dep(dwc, 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;
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 5a7755b..625a2f1 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1136,9 +1136,6 @@ int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value)
 		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)
@@ -1146,7 +1143,7 @@ int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value)
 					value ? "set" : "clear",
 					dep->name);
 		else
-			dep->flags &= ~DWC3_EP_STALL;
+			dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE);
 	}

 	return ret;
--
1.8.3.2