K 10
svn:author
V 8
hselasky
K 8
svn:date
V 27
2015-05-08T16:19:01.403622Z
K 7
svn:log
V 501
Prevent switching to NULL or own window in the "vt_proc_window_switch"
function. This fixes an issue where X11 keyboard input can appear
stuck. The cause of the problem is a duplicate TTY device window
switch IOCTL during boot, which leaves the "vt_switch_timer" running,
because the current window is already selected. While at it factor out
some NULL checks.

PR:			200032
Differential Revision:	https://reviews.freebsd.org/D2480
Reported by:		several people
MFC after:		1 week
Reviewed by:		emaste

END