4.15-stable review patch. If anyone has any objections, please let me know.
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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; }