usb: dwc3: gadget: Return the number of prepared TRBs
In preparation for fixing the check for number of remaining TRBs, revise dwc3_prepare_one_trb_linear() and dwc3_prepare_one_trb_sg() to return the number of prepared TRBs. Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
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@ -1094,7 +1094,7 @@ static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
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stream_id, short_not_ok, no_interrupt, is_last);
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}
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static void dwc3_prepare_one_trb_sg(struct dwc3_ep *dep,
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static int dwc3_prepare_one_trb_sg(struct dwc3_ep *dep,
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struct dwc3_request *req)
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{
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struct scatterlist *sg = req->start_sg;
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@ -1105,6 +1105,7 @@ static void dwc3_prepare_one_trb_sg(struct dwc3_ep *dep,
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unsigned int rem = length % maxp;
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unsigned int remaining = req->request.num_mapped_sgs
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- req->num_queued_sgs;
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unsigned int num_trbs = req->num_trbs;
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/*
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* If we resume preparing the request, then get the remaining length of
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@ -1131,9 +1132,15 @@ static void dwc3_prepare_one_trb_sg(struct dwc3_ep *dep,
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if ((i == remaining - 1) || !length)
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chain = false;
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if (!dwc3_calc_trbs_left(dep))
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break;
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if (rem && usb_endpoint_dir_out(dep->endpoint.desc) && !chain) {
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/* prepare normal TRB */
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if (req->request.length) {
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if (dwc3_calc_trbs_left(dep) < 2)
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goto out;
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req->needs_extra_trb = true;
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dwc3_prepare_one_trb(dep, req, trb_length,
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true, i, false);
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@ -1145,6 +1152,10 @@ static void dwc3_prepare_one_trb_sg(struct dwc3_ep *dep,
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} else if (req->request.zero && req->request.length &&
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!usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
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!rem && !chain) {
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if (dwc3_calc_trbs_left(dep) < 2)
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goto out;
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req->needs_extra_trb = true;
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/* Prepare normal TRB */
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@ -1185,18 +1196,28 @@ static void dwc3_prepare_one_trb_sg(struct dwc3_ep *dep,
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if (!dwc3_calc_trbs_left(dep))
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break;
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}
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out:
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return req->num_trbs - num_trbs;
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}
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static void dwc3_prepare_one_trb_linear(struct dwc3_ep *dep,
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static int dwc3_prepare_one_trb_linear(struct dwc3_ep *dep,
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struct dwc3_request *req)
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{
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unsigned int length = req->request.length;
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unsigned int maxp = usb_endpoint_maxp(dep->endpoint.desc);
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unsigned int rem = length % maxp;
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unsigned int num_trbs = req->num_trbs;
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if (!dwc3_calc_trbs_left(dep))
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goto out;
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if ((!length || rem) && usb_endpoint_dir_out(dep->endpoint.desc)) {
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/* prepare normal TRB */
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if (req->request.length) {
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if (dwc3_calc_trbs_left(dep) < 2)
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goto out;
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req->needs_extra_trb = true;
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dwc3_prepare_one_trb(dep, req, length, true, 0, false);
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}
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@ -1206,6 +1227,10 @@ static void dwc3_prepare_one_trb_linear(struct dwc3_ep *dep,
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} else if (req->request.zero && req->request.length &&
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!usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
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(IS_ALIGNED(req->request.length, maxp))) {
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if (dwc3_calc_trbs_left(dep) < 2)
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goto out;
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req->needs_extra_trb = true;
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/* prepare normal TRB */
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@ -1215,8 +1240,14 @@ static void dwc3_prepare_one_trb_linear(struct dwc3_ep *dep,
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dwc3_prepare_one_trb(dep, req, req->direction ? 0 : maxp,
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false, 1, true);
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} else {
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if (!dwc3_calc_trbs_left(dep))
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goto out;
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dwc3_prepare_one_trb(dep, req, length, false, 0, false);
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}
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out:
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return req->num_trbs - num_trbs;
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}
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/*
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