Commit aefe3d23 authored by Thinh Nguyen's avatar Thinh Nguyen Committed by Felipe Balbi
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usb: dwc3: gadget: Don't prepare beyond a transfer 



Don't prepare TRBs beyond a transfer. In DWC_usb32, its transfer burst
capability may try to read and use TRBs beyond the active transfer. For
other controllers, they don't process the next transfer TRBs until the
current transfer is completed. Explicitly prevent preparing TRBs ahead
for all controllers.

Signed-off-by: default avatarThinh Nguyen <thinhn@synopsys.com>
Signed-off-by: default avatarFelipe Balbi <balbi@kernel.org>
parent e0d19563

drivers/usb/dwc3/gadget.c

+8 −0
Original line number Diff line number Diff line
@@ -1231,6 +1231,14 @@ static void dwc3_prepare_trbs(struct dwc3_ep *dep) 


		if (!dwc3_calc_trbs_left(dep))

			return;



		/*

		 * Don't prepare beyond a transfer. In DWC_usb32, its transfer

		 * burst capability may try to read and use TRBs beyond the

		 * active transfer instead of stopping.

		 */

		if (dep->stream_capable && req->request.is_last)

			return;

	}

}