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authorPeter Hurley <peter@hurleysoftware.com>2016-04-09 17:53:25 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-04-30 09:26:55 -0700
commitd41861ca19c9e96f12a4f1ebbc8255d00909a232 (patch)
tree4b09c15500d404b0b375469dd673f0bc8fd05f5f /drivers/tty/amiserial.c
parent80f02d5424301bf4df195d09b1a664f394435851 (diff)
downloadlinux-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/tty/amiserial.c')
-rw-r--r--drivers/tty/amiserial.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/drivers/tty/amiserial.c b/drivers/tty/amiserial.c
index b4ab97d56351..208f573495dc 100644
--- a/drivers/tty/amiserial.c
+++ b/drivers/tty/amiserial.c
@@ -525,7 +525,7 @@ static int startup(struct tty_struct *tty, struct serial_state *info)
local_irq_save(flags);
- if (port->flags & ASYNC_INITIALIZED) {
+ if (tty_port_initialized(port)) {
free_page(page);
goto errout;
}
@@ -586,7 +586,7 @@ static int startup(struct tty_struct *tty, struct serial_state *info)
*/
change_speed(tty, info, NULL);
- port->flags |= ASYNC_INITIALIZED;
+ tty_port_set_initialized(port, 1);
local_irq_restore(flags);
return 0;
@@ -604,7 +604,7 @@ static void shutdown(struct tty_struct *tty, struct serial_state *info)
unsigned long flags;
struct serial_state *state;
- if (!(info->tport.flags & ASYNC_INITIALIZED))
+ if (!tty_port_initialized(&info->tport))
return;
state = info;
@@ -645,7 +645,7 @@ static void shutdown(struct tty_struct *tty, struct serial_state *info)
set_bit(TTY_IO_ERROR, &tty->flags);
- info->tport.flags &= ~ASYNC_INITIALIZED;
+ tty_port_set_initialized(&info->tport, 0);
local_irq_restore(flags);
}
@@ -1084,7 +1084,7 @@ static int set_serial_info(struct tty_struct *tty, struct serial_state *state,
port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
check_and_exit:
- if (port->flags & ASYNC_INITIALIZED) {
+ if (tty_port_initialized(port)) {
if (change_spd) {
if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
tty->alt_speed = 57600;
@@ -1390,7 +1390,7 @@ static void rs_close(struct tty_struct *tty, struct file * filp)
* line status register.
*/
state->read_status_mask &= ~UART_LSR_DR;
- if (port->flags & ASYNC_INITIALIZED) {
+ if (tty_port_initialized(port)) {
/* disable receive interrupts */
custom.intena = IF_RBF;
mb();
@@ -1538,7 +1538,7 @@ static inline void line_info(struct seq_file *m, int line,
local_irq_save(flags);
status = ciab.pra;
- control = (state->tport.flags & ASYNC_INITIALIZED) ? state->MCR : status;
+ control = tty_port_initialized(&state->tport) ? state->MCR : status;
local_irq_restore(flags);
stat_buf[0] = 0;