git: syscons - Avoid potential blocking issue.
commit f6ce8b1945431efc69d4d9b9b02f73af98edbe53
Author: Antonio Huete Jimenez <tuxillo@quantumachine.net>
Date: Tue Oct 18 12:09:36 2011 +0200
syscons - Avoid potential blocking issue.
- kbd_ioctl() uses it's own locking via lockmgr() and the
syscons softc is protected using a mutex, so we better
avoid both locks at once due possible blocking issues.
In fact, in my particular case the panic only occurs in
real hardware, while on a VMWare VM I had a lockup.
- Only found in 4-CPU SMP setups.
- Discovered via DEBUG_LOCKS option.
DragonFly-bug: <http://bugs.dragonflybsd.org/issue2148>
Reviewed-by: @dillon, @sjg
Summary of changes:
sys/dev/misc/syscons/syscons.c | 50 +++++++++++++++++++++++++++------------
1 files changed, 34 insertions(+), 16 deletions(-)
http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/f6ce8b1945431efc69d4d9b9b02f73af98edbe53
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