K 10
svn:author
V 7
glebius
K 8
svn:date
V 27
2013-12-18T12:50:43.909954Z
K 7
svn:log
V 596
- Rename tty_makedev() into tty_makedevf() and make it capable
  to fail and return error.
- Use make_dev_p() in tty_makedevf() instead of make_dev_cred().
- Always pass MAKEDEV_CHECKNAME flag.
- Optionally pass MAKEDEV_REF flag.
- Provide macro for compatibility with old API.

This fixes races with simultaneous creation and desctruction of
ttys, and makes it possible to call tty_makedevf() from device
cloners.

A race in tty_watermarks() still exist, since the latter drops
lock for M_WAITOK allocation. This will be addressed in separate
commit.

Reviewed by:	kib
Sponsored by:	Nginx, Inc.

END