linux-kernel - [PATCH 5.15 080/107] usb: cdns3: fix incorrect handling TRB

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Message-Id: <20220906132825.186780025@linuxfoundation.org>
Date:   Tue,  6 Sep 2022 15:31:01 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Peter Chen <peter.chen@...nel.org>,
        Pawel Laszczak <pawell@...ence.com>
Subject: [PATCH 5.15 080/107] usb: cdns3: fix incorrect handling TRB_SMM flag for ISOC transfer

From: Pawel Laszczak <pawell@...ence.com>

commit d5dcc33677d7415c5f23b3c052f9e80cbab9ea4e upstream.

The TRB_SMM flag indicates that DMA has completed the TD service with
this TRB. Usually it’s a last TRB in TD. In case of ISOC transfer for
bInterval > 1 each ISOC transfer contains more than one TD associated
with usb request (one TD per ITP). In such case the TRB_SMM flag will
be set in every TD and driver will recognize the end of transfer after
processing the first TD with TRB_SMM. In result driver stops updating
request->actual and returns incorrect actual length.
To fix this issue driver additionally must check TRB_CHAIN which is not
used for isochronous transfers.

Fixes: 249f0a25e8be ("usb: cdns3: gadget: handle sg list use case at completion correctly")
cc: <stable@...r.kernel.org>
Acked-by: Peter Chen <peter.chen@...nel.org>
Signed-off-by: Pawel Laszczak <pawell@...ence.com>
Link: https://lore.kernel.org/r/20220825062207.5824-1-pawell@cadence.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/cdns3/cdns3-gadget.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/usb/cdns3/cdns3-gadget.c
+++ b/drivers/usb/cdns3/cdns3-gadget.c
@@ -1530,7 +1530,8 @@ static void cdns3_transfer_completed(str
 						TRB_LEN(le32_to_cpu(trb->length));
 
 				if (priv_req->num_of_trb > 1 &&
-					le32_to_cpu(trb->control) & TRB_SMM)
+					le32_to_cpu(trb->control) & TRB_SMM &&
+					le32_to_cpu(trb->control) & TRB_CHAIN)
 					transfer_end = true;
 
 				cdns3_ep_inc_deq(priv_ep);