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tty: Replace ASYNC_INITIALIZED bit and update atomically

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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>
This commit is contained in:
Peter Hurley
2016-04-09 17:53:25 -07:00
committed by Greg Kroah-Hartman
parent 80f02d5424
commit d41861ca19
27 changed files with 157 additions and 150 deletions
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17
drivers/tty/serial/crisv10.c
View File

@@ -2599,7 +2599,7 @@ startup(struct e100_serial * info)
/* if it was already initialized, skip this */
if (info->port.flags & ASYNC_INITIALIZED) {
if (tty_port_initialized(&info->port)) {
local_irq_restore(flags);
free_page(xmit_page);
return 0;
@@ -2703,7 +2703,7 @@ startup(struct e100_serial * info)
e100_rts(info, 1);
e100_dtr(info, 1);
info->port.flags |= ASYNC_INITIALIZED;
tty_port_set_initialized(&info->port, 1);
local_irq_restore(flags);
return 0;
@@ -2745,7 +2745,7 @@ shutdown(struct e100_serial * info)
info->tr_running = 0;
}
if (!(info->port.flags & ASYNC_INITIALIZED))
if (!tty_port_initialized(&info->port))
return;
#ifdef SERIAL_DEBUG_OPEN
@@ -2776,7 +2776,7 @@ shutdown(struct e100_serial * info)
if (info->port.tty)
set_bit(TTY_IO_ERROR, &info->port.tty->flags);
info->port.flags &= ~ASYNC_INITIALIZED;
tty_port_set_initialized(&info->port, 0);
local_irq_restore(flags);
}
@@ -3273,9 +3273,9 @@ set_serial_info(struct e100_serial *info,
info->port.low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
check_and_exit:
if (info->port.flags & ASYNC_INITIALIZED) {
if (tty_port_initialized(&info->port))
change_speed(info);
} else
else
retval = startup(info);
return retval;
}
@@ -3628,7 +3628,7 @@ rs_close(struct tty_struct *tty, struct file * filp)
e100_disable_rx(info);
e100_disable_rx_irq(info);
if (info->port.flags & ASYNC_INITIALIZED) {
if (tty_port_initialized(&info->port)) {
/*
* Before we drop DTR, make sure the UART transmitter
* has completely drained; this is especially
@@ -3787,8 +3787,7 @@ block_til_ready(struct tty_struct *tty, struct file * filp,
e100_dtr(info, 1);
local_irq_restore(flags);
set_current_state(TASK_INTERRUPTIBLE);
if (tty_hung_up_p(filp) ||
!(info->port.flags & ASYNC_INITIALIZED)) {
if (tty_hung_up_p(filp) || !tty_port_initialized(&info->port)) {
#ifdef SERIAL_DO_RESTART
if (info->port.flags & ASYNC_HUP_NOTIFY)
retval = -EAGAIN;