Patch "usb: dwc3: gadget: Set maxpacket size for ep0 IN" has been added to the 4.4-stable tree

Patch "usb: dwc3: gadget: Set maxpacket size for ep0 IN" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    usb: dwc3: gadget: Set maxpacket size for ep0 IN

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     usb-dwc3-gadget-set-maxpacket-size-for-ep0-in.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 6180026341e852a250e1f97ebdcf71684a3c81b9 Mon Sep 17 00:00:00 2001
From: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Date: Fri, 12 Jan 2018 18:18:05 -0800
Subject: usb: dwc3: gadget: Set maxpacket size for ep0 IN

From: Thinh Nguyen <Thinh.Nguyen@synopsys.com>

commit 6180026341e852a250e1f97ebdcf71684a3c81b9 upstream.

There are 2 control endpoint structures for DWC3. However, the driver
only updates the OUT direction control endpoint structure during
ConnectDone event. DWC3 driver needs to update the endpoint max packet
size for control IN endpoint as well. If the max packet size is not
properly set, then the driver will incorrectly calculate the data
transfer size and fail to send ZLP for HS/FS 3-stage control read
transfer.

The fix is simply to update the max packet size for the ep0 IN direction
during ConnectDone event.

Cc: stable@vger.kernel.org
Fixes: 72246da40f37 ("usb: Introduce DesignWare USB3 DRD Driver")
Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/dwc3/gadget.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2393,6 +2393,8 @@ static void dwc3_gadget_conndone_interru
 		break;
 	}
 
+	dwc->eps[1]->endpoint.maxpacket = dwc->gadget.ep0->maxpacket;
+
 	/* Enable USB2 LPM Capability */
 
 	if ((dwc->revision > DWC3_REVISION_194A)


Patches currently in stable-queue which might be from Thinh.Nguyen@synopsys.com are

queue-4.4/usb-dwc3-gadget-set-maxpacket-size-for-ep0-in.patch