Peter Hurley 9356b535fc
n_tty: Access termios values safely ...
Use termios_rwsem to guarantee safe access to the termios values.
This is particularly important for N_TTY as changing certain termios
settings alters the mode of operation.
termios_rwsem must be dropped across throttle/unthrottle since
those functions claim the termios_rwsem exclusively (to guarantee
safe access to the termios and for mutual exclusion).
Signed-off-by: Peter Hurley <peter@hurleysoftware.com >
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org >
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