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Subject[PATCH] usb: cdns3: fix incorrect handling TRB_SMM flag for ISOC transfer
Date
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@vger.kernel.org>
Signed-off-by: Pawel Laszczak <pawell@cadence.com>
---
drivers/usb/cdns3/cdns3-gadget.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c
index fa8263951e63..a6618a922c61 100644
--- a/drivers/usb/cdns3/cdns3-gadget.c
+++ b/drivers/usb/cdns3/cdns3-gadget.c
@@ -1529,7 +1529,8 @@ static void cdns3_transfer_completed(struct cdns3_device *priv_dev,
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);
--
2.25.1
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