K 10
svn:author
V 3
ian
K 8
svn:date
V 27
2017-01-12T21:18:43.792223Z
K 7
svn:log
V 274
Restructure the tty_drain loop so that device-busy is checked one more time
after tty_timedwait() returns an error only if the error is EWOULDBLOCK;
other errors cause an immediate return.  This fixes the case of the tty
disappearing while in tty_drain().

Reported by:	pho

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