From: Daniel Glöckner Date: Tue, 17 Nov 2009 09:52:56 +0000 (+0530) Subject: USB: musb: respect usb_request->zero in control requests X-Git-Tag: firefly_0821_release~11813^2~3 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=5542bc2ac7b52c021fc9c7a96329955491b7e763;p=firefly-linux-kernel-4.4.55.git USB: musb: respect usb_request->zero in control requests In gadget mode the answer to a control request should be followed by a zero-length packet if the amount transferred is an exact multiple of the endpoint's packet size and the requests has its "zero" flag set. This patch prevents the request from being immediately removed from the queue when a control IN transfer ends on a full packet and "zero" is set. The next time ep0_txstate is entered, a zero-length packet is queued and the request is removed as fifo_count is 0. Signed-off-by: Daniel Glöckner Signed-off-by: Ajay Kumar Gupta Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/musb/musb_gadget_ep0.c b/drivers/usb/musb/musb_gadget_ep0.c index 7a6778675ad3..522efb31b56b 100644 --- a/drivers/usb/musb/musb_gadget_ep0.c +++ b/drivers/usb/musb/musb_gadget_ep0.c @@ -511,7 +511,8 @@ static void ep0_txstate(struct musb *musb) /* update the flags */ if (fifo_count < MUSB_MAX_END0_PACKET - || request->actual == request->length) { + || (request->actual == request->length + && !request->zero)) { musb->ep0_state = MUSB_EP0_STAGE_STATUSOUT; csr |= MUSB_CSR0_P_DATAEND; } else