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usb: dwc3: gadget: stop touching HWO TRBs
Say we have three requests prepared to the HW (reqA, reqB, and reqC). All of them are composed of SG-lists with several entries and they all requests interrupt only on last TRBs of the SG-list. When we get interrupt for reqA, it could be that reqB is already half-way transferred and some of its TRBs will have HWO already cleared. It's okay to free up TRBs without HWO bit set, but we need to guarantee we don't giveback a request that's half-way transferred as that will confuse gadget drivers. Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
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@ -2104,6 +2104,9 @@ static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep,
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for_each_sg(sg, s, pending, i) {
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trb = &dep->trb_pool[dep->trb_dequeue];
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if (trb->ctrl & DWC3_TRB_CTRL_HWO)
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break;
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req->sg = sg_next(s);
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req->num_pending_sgs--;
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