git: kernel - add spinlock to syscons console write path

[Matthew Dillon]

commit 82d1ed25dd0260190823a69517b17901d529b14a
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Sun Jan 17 17:23:53 2010 -0800

    kernel - add spinlock to syscons console write path
    
    * Add a spinlock in the console write path which is shared with
      general console writes (CONS_LOCK is only used for kernel console
      writes).
    
    * Fixes MP races between kprintf() and general console writes which
      can cause sc->videoio_in_progress to get out of sync, causing
      vga consoles to stop generating output.

Summary of changes:
 sys/dev/misc/syscons/syscons.c |   83 ++++++++++++++++++++++++++++++----------
 sys/dev/misc/syscons/syscons.h |    1 -
 2 files changed, 63 insertions(+), 21 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/82d1ed25dd0260190823a69517b17901d529b14a


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