GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-06-22 22:51:37 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

tty: Replace ASYNC_NORMAL_ACTIVE bit and update atomically

Browse source 
Replace ASYNC_NORMAL_ACTIVE bit in the tty_port::flags field with
TTY_PORT_ACTIVE bit in the tty_port::iflags field. Introduce helpers
tty_port_set_active() and tty_port_active() to abstract atomic bit ops.

Extract state changes from port lock sections, as this usage is
broken and confused; the state transitions are protected by the
tty lock (which mutually excludes parallel open/close/hangup),
and no user tests the active state while holding the port lock.

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 17:53:22 -07:00 • committed by Greg Kroah-Hartman
parent 5604a98e2f
commit 807c8d81f4
11 changed files with 53 additions and 42 deletions
Download patch file Download diff file Expand all files Collapse all files

12
include/linux/tty.h
View file

@ -571,6 +571,18 @@ static inline void tty_port_set_cts_flow(struct tty_port *port, bool val)
clear_bit(TTY_PORT_CTS_FLOW, &port->iflags);
}
static inline bool tty_port_active(struct tty_port *port)
{
return test_bit(TTY_PORT_ACTIVE, &port->iflags);
}
static inline void tty_port_set_active(struct tty_port *port, bool val)
{
if (val)
set_bit(TTY_PORT_ACTIVE, &port->iflags);
else
clear_bit(TTY_PORT_ACTIVE, &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);