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usb: dwc3: Do not process request if HWO is set for its TRB

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If the HWO bit is set for the TRB (or the first TRB if scatter-gather
is used) of a request, it implies that core is still processing it.
In that case do not reclaim that TRB and also do not process
the request and give it back to the function driver.

Change-Id: Ia9fbaee443ad53d9a52909b0906a1d0ec1f2638a
Signed-off-by: Sriharsha Allenki <sallenki@codeaurora.org>
This commit is contained in:
Sriharsha Allenki 2019-11-28 15:05:36 +05:30 • committed by Gerrit - the friendly Code Review server
commit e24e42fa12
1 changed files with 11 additions and 0 deletions
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11
drivers/usb/dwc3/gadget.c
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@ -2830,8 +2830,19 @@ static int dwc3_gadget_ep_cleanup_completed_request(struct dwc3_ep *dep,
const struct dwc3_event_depevt *event,
struct dwc3_request *req, int status)
{
struct dwc3 *dwc = dep->dwc;
int ret;
/*
* If the HWO is set, it implies the TRB is still being
* processed by the core. Hence do not reclaim it until
* it is processed by the core.
*/
if (req->trb->ctrl & DWC3_TRB_CTRL_HWO) {
dbg_event(0xFF, "PEND TRB", dep->number);
return 1;
}
if (req->num_pending_sgs)
ret = dwc3_gadget_ep_reclaim_trb_sg(dep, req, event,
status);