detailed trace query

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following alan's tip, i have run my program w/no code changes and i dont see any claim errors, weird!

but i do have a question; consider i am sending via interrupt xfers 2 - 8 byte xfers to my widget
and i read back 2 - 8 byte responses.  the dmesg from running my program twice looks like, ...


[  267.640170] usb 3-2: new low speed USB device using uhci_hcd and address 2
[  267.808286] usb 3-2: New USB device found, idVendor=1808, idProduct=5555
[  267.808302] usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  267.808314] usb 3-2: Product: USB to OBD-2
[  267.808323] usb 3-2: Manufacturer: Multiplex Engineering
[  267.808666] usb 3-2: configuration #1 chosen from 1 choice
[  272.910640] usb 3-2: opened by process 1915: lsusb
[  272.910881] usb 3-2: opened by process 1915: lsusb
[  287.653667] usb 3-2: opened by process 1916: obdscan
[  287.653725] usb 3-2: usbdev_ioctl: GETDRIVER
[  287.654007] usb 3-2: usbdev_ioctl: IOCTL
[  287.655850] usb 3-2: usbdev_ioctl: CLAIMINTERFACE
[  287.657241] usb 3-2: usbdev_ioctl: SUBMITURB
[  287.657252] usb 3-2: interrupt urb
[  287.657265] usb 3-2: direction=OUT
[  287.657271] usb 3-2: userurb=08c74150
[  287.657276] usb 3-2: transfer_buffer_length=8
[  287.657282] usb 3-2: actual_length=0
[  287.657286] usb 3-2: data: e4 80 05 61 6a f1 01 00
[  287.664205] usb 3-2: urb complete
[  287.664214] usb 3-2: direction=OUT
[  287.664219] usb 3-2: userurb=08c74150
[  287.664223] usb 3-2: transfer_buffer_length=8
[  287.664227] usb 3-2: actual_length=8
[  287.664231] usb 3-2: data: e4 80 05 61 6a f1 01 00
[  287.665359] usb 3-2: usbdev_ioctl: REAPURBDELAY
[  287.665410] usb 3-2: usbdev_ioctl: SUBMITURB
[  287.665423] usb 3-2: interrupt urb
[  287.665435] usb 3-2: direction=OUT
[  287.665443] usb 3-2: userurb=08c74150
[  287.665451] usb 3-2: transfer_buffer_length=8
[  287.665459] usb 3-2: actual_length=0
[  287.665466] usb 3-2: data: 00 00 00 00 00 00 42 00
[  287.672238] usb 3-2: urb complete
[  287.672251] usb 3-2: direction=OUT
[  287.672260] usb 3-2: userurb=08c74150
[  287.672269] usb 3-2: transfer_buffer_length=8
[  287.672277] usb 3-2: actual_length=8
[  287.672284] usb 3-2: data: 00 00 00 00 00 00 42 00
[  287.672399] usb 3-2: usbdev_ioctl: REAPURBDELAY
[  287.672436] usb 3-2: usbdev_ioctl: SUBMITURB
[  287.672444] usb 3-2: interrupt urb
[  287.672453] usb 3-2: direction=IN
[  287.672459] usb 3-2: userurb=08c74150
[  287.672465] usb 3-2: transfer_buffer_length=8
[  287.672471] usb 3-2: actual_length=0
[  287.672476] usb 3-2: data: 00 00 00 00 00 00 42 00
[  287.816239] usb 3-2: urb complete
[  287.816254] usb 3-2: direction=IN
[  287.816264] usb 3-2: userurb=08c74150
[  287.816272] usb 3-2: transfer_buffer_length=8
[  287.816281] usb 3-2: actual_length=8
[  287.816288] usb 3-2: data: 40 84 41 6b 10 41 00 bf
[  287.816390] usb 3-2: usbdev_ioctl: REAPURBDELAY
[  287.816436] usb 3-2: usbdev_ioctl: SUBMITURB
[  287.816447] usb 3-2: interrupt urb
[  287.816458] usb 3-2: direction=IN
[  287.816466] usb 3-2: userurb=08c74150
[  287.816474] usb 3-2: transfer_buffer_length=8
[  287.816483] usb 3-2: actual_length=0
[  287.816490] usb 3-2: data: 40 84 41 6b 10 41 00 bf
[  287.824237] usb 3-2: urb complete
[  287.824249] usb 3-2: direction=IN
[  287.824259] usb 3-2: userurb=08c74150
[  287.824267] usb 3-2: transfer_buffer_length=8
[  287.824276] usb 3-2: actual_length=8
[  287.824283] usb 3-2: data: 9f b9 90 05 00 2d 00 00
[  287.824381] usb 3-2: usbdev_ioctl: REAPURBDELAY
[  287.824536] usb 3-2: usbdev_ioctl: RELEASEINTERFACE

[  300.214387] usb 3-2: opened by process 1920: obdscan

my question is, seeing the regular pattern of 'actual_length=0', i am guessing that is normal?

thx, jackc...


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   jack craig
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