diff options
| author | Peter Hurley <peter@hurleysoftware.com> | 2016-04-09 17:53:25 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-04-30 09:26:55 -0700 |
| commit | d41861ca19c9e96f12a4f1ebbc8255d00909a232 (patch) | |
| tree | 4b09c15500d404b0b375469dd673f0bc8fd05f5f /drivers/s390 | |
| parent | 80f02d5424301bf4df195d09b1a664f394435851 (diff) | |
| download | linux-d41861ca19c9e96f12a4f1ebbc8255d00909a232.tar.bz2 | |
tty: Replace ASYNC_INITIALIZED bit and update atomically
Replace ASYNC_INITIALIZED bit in the tty_port::flags field with
TTY_PORT_INITIALIZED bit in the tty_port::iflags field. Introduce helpers
tty_port_set_initialized() and tty_port_initialized() to abstract
atomic bit ops.
Note: the transforms for test_and_set_bit() and test_and_clear_bit()
are unnecessary as the state transitions are already mutually exclusive;
the tty lock prevents concurrent open/close/hangup.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/s390')
| -rw-r--r-- | drivers/s390/char/con3215.c | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/drivers/s390/char/con3215.c b/drivers/s390/char/con3215.c index 114fe2845270..931d10e86837 100644 --- a/drivers/s390/char/con3215.c +++ b/drivers/s390/char/con3215.c @@ -311,8 +311,7 @@ static void raw3215_timeout(unsigned long __data) */ static inline void raw3215_try_io(struct raw3215_info *raw) { - if (!(raw->port.flags & ASYNC_INITIALIZED) || - tty_port_suspended(&raw->port)) + if (!tty_port_initialized(&raw->port) || tty_port_suspended(&raw->port)) return; if (raw->queued_read != NULL) raw3215_start_io(raw); @@ -616,10 +615,10 @@ static int raw3215_startup(struct raw3215_info *raw) { unsigned long flags; - if (raw->port.flags & ASYNC_INITIALIZED) + if (tty_port_initialized(&raw->port)) return 0; raw->line_pos = 0; - raw->port.flags |= ASYNC_INITIALIZED; + tty_port_set_initialized(&raw->port, 1); spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); raw3215_try_io(raw); spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); @@ -635,8 +634,7 @@ static void raw3215_shutdown(struct raw3215_info *raw) DECLARE_WAITQUEUE(wait, current); unsigned long flags; - if (!(raw->port.flags & ASYNC_INITIALIZED) || - (raw->flags & RAW3215_FIXED)) + if (!tty_port_initialized(&raw->port) || (raw->flags & RAW3215_FIXED)) return; /* Wait for outstanding requests, then free irq */ spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); @@ -650,7 +648,7 @@ static void raw3215_shutdown(struct raw3215_info *raw) spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); remove_wait_queue(&raw->empty_wait, &wait); set_current_state(TASK_RUNNING); - raw->port.flags &= ~ASYNC_INITIALIZED; + tty_port_set_initialized(&raw->port, 1); } spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); } |