[PATCH 5.15 105/779] usb: dwc3: gadget: fix high speed multiplier setting

[Greg Kroah-Hartman]

From: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>

commit 8affe37c525d800a2628c4ecfaed13b77dc5634a upstream.

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@xxxxxxxxxx>
Signed-off-by: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220704141812.1532306-3-m.grzeschik@xxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/usb/dwc3/gadget.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1251,10 +1251,10 @@ static void dwc3_prepare_one_trb(struct
 				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);