HwScsiResetBus

NTDEV
1

I’m not sure my xen pv disk driver is completing the HwScsiResetBus
correctly. What I do is:

  1. Set the status to SRB_STATUS_BUS_RESET and complete all requests on
    the queue
  2. For requests already submitted to the backend, wait for completion
    and mark the request as SRB_STATUS_BUS_RESET and complete it

In this case due to heavy load there is a substantial delay between the
call to HwScsiResetBus and the last outstanding request being completed
with SRB_STATUS_BUS_RESET. Could that be a problem? I can’t remove
requests from the ‘hardware’ queue or indeed reset the hardware queue in
any way (not from DIRQL anyway) but I may be able to work something else
out where I complete them immediately in HwScsiResetBus and then just
throw them away when they come back from xen…

Thanks

James

2

In practice, always returning TRUE should work. In fact, I’ve never seen ResetBus called except in special cases such as hibernation.