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

["Jean-Yves Migeon" <jym%netbsd.org@localhost>]

Module Name:    src
Committed By:   jym
Date:           Sun May 15 20:58:54 UTC 2011

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

Log Message:
As noted by rmind@, use the _nv() to fetch the new value. A race is
possible between the decrement and the fetch of the ref counter value,
hence we might call the G/C routine twice. Not good.

Also remove the 'volatile' attribute, refcnt is only use by xbdi_put/_get
and should not be exposed anywhere else (except for initialization).


To generate a diff of this commit:
cvs rdiff -u -r1.35 -r1.36 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.