tty: Allow safe access to termios for set_ldisc() handlers
authorPeter Hurley <peter@hurleysoftware.com>
Wed, 5 Nov 2014 18:11:41 +0000 (13:11 -0500)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 6 Nov 2014 22:57:27 +0000 (14:57 -0800)
commit9191aaaa82d3149767125d58b2d260a3749d9f5e
treec551a4b7588fb105c12c45fad1eec2dddff1541d
parent3f40f5b2a22110754ce469f5722bade8aeb241e5
tty: Allow safe access to termios for set_ldisc() handlers

Allow a tty driver to safely access termios settings while handling
the set_ldisc() notification. UART drivers use the set_ldisc()
notification to check if the N_PPS line discipline is being enabled;
if so, modem status interrupts may also need to be enabled. Conversely,
modem status interrupts may need to be disabled if switching away
from the N_PPS line discipline.

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