git: kernel - Use atomic ops for devstat's ds->busy_count field.

[Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxxxxx>]

commit 8bd60bc26686ba32daa68a8196296ecbc2d048a3
Author: Matthew Dillon <dillon@apollo.backplane.com>
Date:   Wed Jan 19 11:12:47 2011 -0800

    kernel - Use atomic ops for devstat's ds->busy_count field.
    
    * Use atomic ops to manage the busy_count field as these functions can
      be called MP.
    
    * This should avoid negative busy_count transitions due to MP races on the
      field.
    
    Reported-by: Peter Avalos <peter@theshell.com>

Summary of changes:
 sys/kern/subr_devstat.c |   11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/8bd60bc26686ba32daa68a8196296ecbc2d048a3


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