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usb: cdns3: gadget: clear trb->length as zero after preparing every trb

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It clears trb->length as zero before preparing td, but if scatter
buffer is used for td, there are several trbs within td, it needs to clear
every trb->length as zero, otherwise, the default value for trb->length
may not be zero after it begins to use the second round of trb rings.

Fixes: abc6b57904 ("usb: cdns3: gadget: using correct sg operations")
Signed-off-by: Peter Chen <peter.chen@nxp.com>
This commit is contained in:
Peter Chen 2020-11-25 20:35:23 +08:00
parent 6703052fe3
commit 24fdaeeb29
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1 changed files with 1 additions and 0 deletions
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drivers/usb/cdns3/gadget.c
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@ -1260,6 +1260,7 @@ static int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep,
priv_req->end_trb = priv_ep->enqueue;
cdns3_ep_inc_enq(priv_ep);
trb = priv_ep->trb_pool + priv_ep->enqueue;
trb->length = 0;
} while (sg_iter < num_trb);
trb = priv_req->trb;