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 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: usb-dwc3-gadget-set-maxpacket-size-for-ep0-in.patch and it can be found in the queue-4.15 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 @@ -2744,6 +2744,8 @@ 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-4.15/usb-dwc3-ep0-reset-trb-counter-for-ep0-in.patch queue-4.15/usb-dwc3-gadget-set-maxpacket-size-for-ep0-in.patch