Re: [Linux-usb-users] USB: Non zero status

Hi!
I followed the thread regarding the -EXDEV error, which leads me to the
same point.

I'm running an ISDN USB device, which is running ISO 6 endpoints. Each
Endpoint (3 tx + 3 rx) is handled by two ISO URBs, each ISO URB is
contain 8 ISO packets, each ISO packet is containing 1 up to 8 bytes
payload. I use two ISO URBs for each endpoints to have a seamless ISO
traffic, which is essential for my flow-control.

>From time to time I get the -EXDEV error in the ISO completion.
rx_iso_complete with -EXDEV urb->status -18, fifonum 5
rx_iso_complete ISO packet 1, status: -18
rx_iso_complete ISO packet 2, status: -18
rx_iso_complete ISO packet 3, status: -18
rx_iso_complete with -EXDEV urb->status -18, fifonum 1
rx_iso_complete ISO packet 1, status: -18
rx_iso_complete ISO packet 2, status: -18
rx_iso_complete ISO packet 3, status: -18
rx_iso_complete with -EXDEV urb->status -18, fifonum 3
rx_iso_complete ISO packet 1, status: -18
rx_iso_complete ISO packet 2, status: -18
rx_iso_complete ISO packet 3, status: -18
tx_iso_complete with -EXDEV, urb->status -18, fifonum 4
tx_iso_complete with -EXDEV, ISO packet 1, status: -18
tx_iso_complete with -EXDEV, ISO packet 2, status: -18
tx_iso_complete with -EXDEV, ISO packet 3, status: -18
tx_iso_complete with -EXDEV, urb->status -18, fifonum 0
tx_iso_complete with -EXDEV, ISO packet 1, status: -18
tx_iso_complete with -EXDEV, ISO packet 2, status: -18
tx_iso_complete with -EXDEV, ISO packet 3, status: -18
tx_iso_complete with -EXDEV, urb->status -18, fifonum 2
tx_iso_complete with -EXDEV, ISO packet 1, status: -18
tx_iso_complete with -EXDEV, ISO packet 2, status: -18
tx_iso_complete with -EXDEV, ISO packet 3, status: -18


That means 6 ISO URBs get a callback with the 'partially completed'
error, each one with packet 1 to 3.

Is the recommended handling of -EXDEV not to handle it at all, but go on
re submitting URBs? Should I assume the data contained in the first 3 of
8 ISO packets within that URBs was lost?

my patch to care about -EXDEV:
http://git.misdn.org/?p=mISDN.git;a=commit;h=87c9cfb7e302738eb026010fa8deed67fa3c1a17


greetings from Cologne
  Martin

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