From 24fdaeeb294c14ea743ec99ada92380c060a428a Mon Sep 17 00:00:00 2001 From: Peter Chen Date: Wed, 25 Nov 2020 20:35:23 +0800 Subject: [PATCH] usb: cdns3: gadget: clear trb->length as zero after preparing every trb 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: abc6b579048e ("usb: cdns3: gadget: using correct sg operations") Signed-off-by: Peter Chen --- drivers/usb/cdns3/gadget.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/usb/cdns3/gadget.c b/drivers/usb/cdns3/gadget.c index 365f30fb1159..0aa85cc07ff1 100644 --- a/drivers/usb/cdns3/gadget.c +++ b/drivers/usb/cdns3/gadget.c @@ -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;