usb: dwc3: gadget: fix high speed multiplier setting

For High-Speed Transfers the prepare_one_trb function is calculating the
multiplier setting for the trb based on the length parameter of the trb
currently prepared. This assumption is wrong. For trbs with a sg list,
the length of the actual request has to be taken instead.

Fixes: 40d829fb2ec6 ("usb: dwc3: gadget: Correct ISOC DATA PIDs for short packets")
Cc: stable <stable@kernel.org>
Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Link: https://lore.kernel.org/r/20220704141812.1532306-3-m.grzeschik@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index dcd8fc209ccd6aa4b26cde3caa0226277d354ef3..4366c45c28cf6d70141373b3a8cd385be55a5e21 100644 (file)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1265,10 +1265,10 @@ static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
                                unsigned int mult = 2;
                                unsigned int maxp = usb_endpoint_maxp(ep->desc);
 
-                               if (trb_length <= (2 * maxp))
+                               if (req->request.length <= (2 * maxp))
                                        mult--;
 
-                               if (trb_length <= maxp)
+                               if (req->request.length <= maxp)
                                        mult--;
 
                                trb->size |= DWC3_TRB_SIZE_PCM1(mult);