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usb: dwc3: gadget: Reclaim extra TRBs after request completion

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[ Upstream commit 690e5c2dc29f8891fcfd30da67e0d5837c2c9df5 ]

An SG request may be partially completed (due to no available TRBs).
Don't reclaim extra TRBs and clear the needs_extra_trb flag until the
request is fully completed. Otherwise, the driver will reclaim the wrong
TRB.

Cc: stable@vger.kernel.org
Fixes: 1f512119a0 ("usb: dwc3: gadget: add remaining sg entries to ring")
Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Thinh Nguyen 2020-09-24 01:21:24 -07:00 • committed by Greg Kroah-Hartman
commit e24516cf62
1 changed files with 5 additions and 5 deletions
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10
drivers/usb/dwc3/gadget.c
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@ -2627,6 +2627,11 @@ static int dwc3_gadget_ep_cleanup_completed_request(struct dwc3_ep *dep,
ret = dwc3_gadget_ep_reclaim_trb_linear(dep, req, event,
status);
req->request.actual = req->request.length - req->remaining;
if (!dwc3_gadget_ep_request_completed(req))
goto out;
if (req->needs_extra_trb) {
unsigned int maxp = usb_endpoint_maxp(dep->endpoint.desc);
@ -2642,11 +2647,6 @@ static int dwc3_gadget_ep_cleanup_completed_request(struct dwc3_ep *dep,
req->needs_extra_trb = false;
}
req->request.actual = req->request.length - req->remaining;
if (!dwc3_gadget_ep_request_completed(req))
goto out;
dwc3_gadget_giveback(dep, req, status);
out: