umcs (4-Port-USB-serial) triggering way too much ehci IRQs

[Harald Schmalzbauer]

 Bezüglich Hans Petter Selasky's Nachricht vom 17.09.2013 07:14
(localtime):
> Hi,
>
> Check using usbdump -i usbusX -f Y -s 65536 -vvv
>
> what is going on. Maybe some USB transfers are returning zero length data from the chip.

Thanks for your help!
I can't really read the numbers, but these 4 actions look all the time,
whe no connection is open:
08:39:19.889658 usbus1.4 SUBM-INTR-EP=00000089,SPD=HIGH,NFR=1,SLEN=0,IVAL=2
 frame[0] READ 16 bytes
 flags 0xa <SHORT_XFER_OK|PIPE_BOF|0>
 status 0xcb023
<OPEN|TRANSFERRING|STARTED|SHORT_XFER_OK|BDMA_ENABLE|BDMA_SETUP|CAN_CANCEL_IMMED|DOING_CALLBACK|0>
08:39:19.891655 usbus1.4
DONE-INTR-EP=00000089,SPD=HIGH,NFR=1,SLEN=8,IVAL=2,ERR=0
 frame[0] READ 5 bytes
 0000  C1 C1 C1 01 55 -- -- --  -- -- -- -- -- -- -- --  |....U           |
 flags 0xa <SHORT_XFER_OK|PIPE_BOF|0>
 status 0xeb021
<OPEN|STARTED|SHORT_XFER_OK|BDMA_ENABLE|BDMA_SETUP|CURR_DMA_SET|CAN_CANCEL_IMMED|DOING_CALLBACK|0>
08:39:19.891658 usbus1.4 SUBM-INTR-EP=00000089,SPD=HIGH,NFR=1,SLEN=0,IVAL=2
 frame[0] READ 16 bytes
 flags 0xa <SHORT_XFER_OK|PIPE_BOF|0>
 status 0xeb023
<OPEN|TRANSFERRING|STARTED|SHORT_XFER_OK|BDMA_ENABLE|BDMA_SETUP|CURR_DMA_SET|CAN_CANCEL_IMMED|DOING_CALLBACK|0>
08:39:19.893656 usbus1.4
DONE-INTR-EP=00000089,SPD=HIGH,NFR=1,SLEN=8,IVAL=2,ERR=0
 frame[0] READ 5 bytes
 0000  C1 C1 C1 01 55 -- -- --  -- -- -- -- -- -- -- --  |....U           |
 flags 0xa <SHORT_XFER_OK|PIPE_BOF|0>
 status 0xcb021
<OPEN|STARTED|SHORT_XFER_OK|BDMA_ENABLE|BDMA_SETUP|CAN_CANCEL_IMMED|DOING_CALLBACK|0>

Thanks,

-Harry


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