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tty: Replace ASYNC_CHECK_CD and update atomically

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Replace ASYNC_CHECK_CD bit in the tty_port::flags field with
TTY_PORT_CHECK_CD bit in the tty_port::iflags field. Introduce helpers
tty_port_set_check_carrier() and tty_port_check_carrier() to abstract
the atomic bit ops.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2016-04-09 17:53:23 -07:00 • committed by Greg Kroah-Hartman
parent 807c8d81f4
commit 2d68655d15
13 changed files with 39 additions and 64 deletions
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13
include/linux/tty.h
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@ -584,6 +584,19 @@ static inline void tty_port_set_active(struct tty_port *port, bool val)
clear_bit(TTY_PORT_ACTIVE, &port->iflags);
}
static inline bool tty_port_check_carrier(struct tty_port *port)
{
return test_bit(TTY_PORT_CHECK_CD, &port->iflags);
}
static inline void tty_port_set_check_carrier(struct tty_port *port, bool val)
{
if (val)
set_bit(TTY_PORT_CHECK_CD, &port->iflags);
else
clear_bit(TTY_PORT_CHECK_CD, &port->iflags);
}
extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
extern int tty_port_carrier_raised(struct tty_port *port);