usb_event_thread/usb_discover called when block transfer in progress [FreeBSD 6.x]

[Hans Petter Selasky]

On 09/10/15 00:04, Shrikanth Kamath wrote:
> Basic query is it okay for usb_event_thread/usb_discover to get called
> when a block transfer is in progress and there was no USB
> attach/detach event?
>
> Is it triggered by usb controller?

Hi,

This event is typically triggered by a port-status change event. Are you 
seeing a particular problem?

>
> Are there any documents on the FreeBSD 6.x USB stack?

Not as I'm aware about.

>
> USB_DEBUG logs
>
> usb_transfer_complete: repeat=0 new head=0
> usbd_start_next: pipe=0x82acd7d0, xfer=0
> usb_event_thread: woke up
> usb_discover
> usbd_transfer: xfer=0x82b7a320, flags=0, pipe=0x82acd820, running=0
> usbd_dump_queue: pipe=0x82acd820
> usb_allocmem: use frag=0x9507df00 size=31
> usb_insert_transfer: pipe=0x82acd820 running=0 timeout=65000
> usb_transfer_complete: pipe=0x82acd820 xfer=0x82b7a320 status=0 actlen=31
>

--HPS