tree 31560d1f0eaba903fbe7dd2d3032988ddfadb189
parent a8f3a29718f77df3116955d100756f67fafabec0
author Peter Hurley <peter@hurleysoftware.com> 1452404712 -0800
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1454011082 -0800

n_tty: Fix stuck write wakeup

If signal-driven i/o is disabled while write wakeup is pending (ie.,
n_tty_write() has set TTY_DO_WRITE_WAKEUP but then signal-driven i/o
is disabled), the TTY_DO_WRITE_WAKEUP bit will never be cleared and
will cause tty_wakeup() to always call n_tty_write_wakeup.

Unconditionally clear the write wakeup, and since kill_fasync()
already checks if the fasync ptr is null, call kill_fasync()
unconditionally as well.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>