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UPSTREAM: usb: dwc3: gadget: fix high speed multiplier setting

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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: 40d829fb2e ("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>

Bug: 249635012
(cherry picked from commit 8affe37c525d800a2628c4ecfaed13b77dc5634a)
Change-Id: Iadae731c901b605832b0f819f1c15b57326cfde2
Signed-off-by: Dan Vacura <w36195@motorola.com>
This commit is contained in:
Michael Grzeschik
2022-07-04 16:18:12 +02:00
committed by Dan Vacura
parent 14bd2d1473
commit 93602bed42
1 changed files with 2 additions and 2 deletions
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4
drivers/usb/dwc3/gadget.c
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@@ -1250,10 +1250,10 @@ 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);