K 10
svn:author
V 2
ed
K 8
svn:date
V 27
2008-09-24T11:16:09.802531Z
K 7
svn:log
V 448
Fix a crash when calling tty_rel_free() while draining during closure.

Yesterday I got two reports of potential crashes, related to TTY
deallocation during device closure. When a thread is in TF_OPENCLOSE,
draining its output upon closure, we should not allow calls to
tty_rel_free() to happen at the same time. This could cause the TTY to
be torn down twice.

PR:		kern/127561
Reported by:	KOIE Hidetaka <koie suri co jp>
Discussed with:	thompsa

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