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usb: dwc3: gadget: Wrap around when skip TRBs

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commit 2dedea035a upstream.

When skipping TRBs, we need to account for wrapping around the ring
buffer and not modifying some invalid TRBs. Without this fix, dwc3 won't
be able to check for available TRBs.

Cc: stable <stable@vger.kernel.org>
Fixes: 7746a8dfb3 ("usb: dwc3: gadget: extract dwc3_gadget_ep_skip_trbs()")
Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thinh Nguyen 2020-03-05 13:24:01 -08:00 committed by Greg Kroah-Hartman
parent 170f88a47b
commit 94d2d84bca
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/dwc3/gadget.c
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@ -1518,7 +1518,7 @@ static void dwc3_gadget_ep_skip_trbs(struct dwc3_ep *dep, struct dwc3_request *r
for (i = 0; i < req->num_trbs; i++) {
struct dwc3_trb *trb;
trb = req->trb + i;
trb = &dep->trb_pool[dep->trb_dequeue];
trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
dwc3_ep_inc_deq(dep);
}