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

usb: dwc3: ep0: Reset TRB counter 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-ep0-reset-trb-counter-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 f035d139ffece7b6a7b8bfb17bd0ba715ee57a04 Mon Sep 17 00:00:00 2001

From: Thinh Nguyen Thinh.Nguyen@synopsys.com Date: Fri, 12 Jan 2018 18:18:27 -0800 Subject: usb: dwc3: ep0: Reset TRB counter for ep0 IN

From: Thinh Nguyen Thinh.Nguyen@synopsys.com

commit f035d139ffece7b6a7b8bfb17bd0ba715ee57a04 upstream.

DWC3 tracks TRB counter for each ep0 direction separately. In control read transfer completion handler, the driver needs to reset the TRB enqueue counter for ep0 IN direction. Currently the driver only resets the TRB counter for control OUT endpoint. Check for the data direction and properly reset the TRB counter from correct control endpoint.

Cc: stable@vger.kernel.org Fixes: c2da2ff00606 ("usb: dwc3: ep0: don't use ep0in for transfers") 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/ep0.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/usb/dwc3/ep0.c +++ b/drivers/usb/dwc3/ep0.c @@ -858,7 +858,12 @@ static void dwc3_ep0_complete_data(struc trb++; trb->ctrl &= ~DWC3_TRB_CTRL_HWO; trace_dwc3_complete_trb(ep0, trb); - ep0->trb_enqueue = 0; + + if (r->direction) + dwc->eps[1]->trb_enqueue = 0; + else + dwc->eps[0]->trb_enqueue = 0; + dwc->ep0_bounced = false; }

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