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usb: dwc3: gadget: fix skip LINK_TRB on ISOC

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When we reach to link trb, we just need to increase free_slot and then
calculate TRB. Return is not correct, as it will cause wrong TRB DMA
address to fetch in case of update transfer.

Cc: <stable@vger.kernel.org>
Signed-off-by: Pratyush Anand <pratyush.anand@st.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Pratyush Anand
2013-01-14 15:59:35 +05:30
committed by Felipe Balbi
parent cdc359dd87
commit 915e202aee
1 changed files with 5 additions and 8 deletions
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13
drivers/usb/dwc3/gadget.c
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@ -754,21 +754,18 @@ static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
struct dwc3 *dwc = dep->dwc;
struct dwc3_trb *trb;
unsigned int cur_slot;
dev_vdbg(dwc->dev, "%s: req %p dma %08llx length %d%s%s\n",
dep->name, req, (unsigned long long) dma,
length, last ? " last" : "",
chain ? " chain" : "");
trb = &dep->trb_pool[dep->free_slot & DWC3_TRB_MASK];
cur_slot = dep->free_slot;
dep->free_slot++;
/* Skip the LINK-TRB on ISOC */
if (((cur_slot & DWC3_TRB_MASK) == DWC3_TRB_NUM - 1) &&
if (((dep->free_slot & DWC3_TRB_MASK) == DWC3_TRB_NUM - 1) &&
usb_endpoint_xfer_isoc(dep->endpoint.desc))
return;
dep->free_slot++;
trb = &dep->trb_pool[dep->free_slot & DWC3_TRB_MASK];
dep->free_slot++;
if (!req->trb) {
dwc3_gadget_move_request_queued(req);