CVS commit: src/sys/arch/xen/xen

["Manuel Bouyer" <bouyer%netbsd.org@localhost>]

Module Name:    src
Committed By:   bouyer
Date:           Sun Aug  7 17:10:35 UTC 2011

Modified Files:
        src/sys/arch/xen/xen: xbdback_xenbus.c

Log Message:
Several fixes to the continuation engine:
- make sure to enter the continuation loop at splbio(), and add some
  KASSERT() for this.
- When a flush operation is enqueued to the workqueue, make sure the
  continuation loop can't be restarted by a previous workqueue
  completion or an event. We can't restart it at this point because
  the flush even is still recorded as the current I/O.
  For this add a xbdback_co_cache_doflush_wait() which acts as a noop;
  the workqueue callback will restart the loop once the flush is complete.
Should fix "kernel diagnostic assertion xbd_io->xio_mapped == 0" panics
reported by Jeff Rizzo on port-xen@.


To generate a diff of this commit:
cvs rdiff -u -r1.42 -r1.43 src/sys/arch/xen/xen/xbdback_xenbus.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.