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usb: dwc3: gadget: Wrap around when skip TRBs

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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.

Change-Id: I67d1deb78f5ecf03c50c4b2c40a7a067c7efa659
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>
Git-commit: 2dedea035ae82c5af0595637a6eda4655532b21e
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Signed-off-by: Mayank Rana <mrana@codeaurora.org>
This commit is contained in:
Thinh Nguyen 2020-03-05 13:24:01 -08:00 • committed by Mayank Rana
commit 17e7e77f34
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/dwc3/gadget.c
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@ -1642,7 +1642,7 @@ 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);
}