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Message-ID: <BYAPR07MB5381C83A4E06D4972E6874A9DDA79@BYAPR07MB5381.namprd07.prod.outlook.com>
Date: Thu, 9 Jun 2022 07:33:37 +0000
From: Pawel Laszczak <pawell@...ence.com>
To: "3090101217@....edu.cn" <3090101217@....edu.cn>,
"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
"peter.chen@...nel.org" <peter.chen@...nel.org>
CC: "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Jing Leng <jleng@...arella.com>
Subject: RE: [PATCH] usb: cdnsp: Fixed setting last_trb incorrectly
>
>From: Jing Leng <jleng@...arella.com>
>
>When ZLP occurs in bulk transmission, currently cdnsp will set last_trb
>for the last two TRBs, it will trigger an error "ERROR Transfer event TRB
>DMA ptr not part of current TD ...".
>
>Fixes: e913aada0683 ("usb: cdnsp: Fixed issue with ZLP")
>Signed-off-by: Jing Leng <jleng@...arella.com>
Acked-by: Pawel Laszczak <pawell@...ence.com>
>---
> drivers/usb/cdns3/cdnsp-ring.c | 19 +++++++++++--------
> 1 file changed, 11 insertions(+), 8 deletions(-)
>
>diff --git a/drivers/usb/cdns3/cdnsp-ring.c b/drivers/usb/cdns3/cdnsp-ring.c
>index e45c3d6e1536..794e413800ae 100644
>--- a/drivers/usb/cdns3/cdnsp-ring.c
>+++ b/drivers/usb/cdns3/cdnsp-ring.c
>@@ -1941,13 +1941,16 @@ int cdnsp_queue_bulk_tx(struct cdnsp_device *pdev, struct cdnsp_request *preq)
> }
>
> if (enqd_len + trb_buff_len >= full_len) {
>- if (need_zero_pkt)
>- zero_len_trb = !zero_len_trb;
>-
>- field &= ~TRB_CHAIN;
>- field |= TRB_IOC;
>- more_trbs_coming = false;
>- preq->td.last_trb = ring->enqueue;
>+ if (need_zero_pkt && !zero_len_trb) {
>+ zero_len_trb = true;
>+ } else {
>+ zero_len_trb = false;
>+ field &= ~TRB_CHAIN;
>+ field |= TRB_IOC;
>+ more_trbs_coming = false;
>+ need_zero_pkt = false;
>+ preq->td.last_trb = ring->enqueue;
>+ }
> }
>
> /* Only set interrupt on short packet for OUT endpoints. */
>@@ -1962,7 +1965,7 @@ int cdnsp_queue_bulk_tx(struct cdnsp_device *pdev, struct cdnsp_request *preq)
> length_field = TRB_LEN(trb_buff_len) | TRB_TD_SIZE(remainder) |
> TRB_INTR_TARGET(0);
>
>- cdnsp_queue_trb(pdev, ring, more_trbs_coming | zero_len_trb,
>+ cdnsp_queue_trb(pdev, ring, more_trbs_coming,
> lower_32_bits(send_addr),
> upper_32_bits(send_addr),
> length_field,
>--
>2.17.1
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