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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 /net/irda
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 'net/irda')
-rw-r--r--net/irda/ircomm/ircomm_tty.c15
-rw-r--r--net/irda/ircomm/ircomm_tty_ioctl.c2
2 files changed, 9 insertions, 8 deletions
diff --git a/net/irda/ircomm/ircomm_tty.c b/net/irda/ircomm/ircomm_tty.c
index 5b7ce599c709..873c4b707d6a 100644
--- a/net/irda/ircomm/ircomm_tty.c
+++ b/net/irda/ircomm/ircomm_tty.c
@@ -220,10 +220,11 @@ static int ircomm_tty_startup(struct ircomm_tty_cb *self)
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
/* Check if already open */
- if (test_and_set_bit(ASYNCB_INITIALIZED, &self->port.flags)) {
+ if (tty_port_initialized(&self->port)) {
pr_debug("%s(), already open so break out!\n", __func__);
return 0;
}
+ tty_port_set_initialized(&self->port, 1);
/* Register with IrCOMM */
irda_notify_init(&notify);
@@ -257,7 +258,7 @@ static int ircomm_tty_startup(struct ircomm_tty_cb *self)
return 0;
err:
- clear_bit(ASYNCB_INITIALIZED, &self->port.flags);
+ tty_port_set_initialized(&self->port, 0);
return ret;
}
@@ -318,13 +319,12 @@ static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self,
spin_unlock_irqrestore(&port->lock, flags);
while (1) {
- if (C_BAUD(tty) && test_bit(ASYNCB_INITIALIZED, &port->flags))
+ if (C_BAUD(tty) && tty_port_initialized(port))
tty_port_raise_dtr_rts(port);
set_current_state(TASK_INTERRUPTIBLE);
- if (tty_hung_up_p(filp) ||
- !test_bit(ASYNCB_INITIALIZED, &port->flags)) {
+ if (tty_hung_up_p(filp) || !tty_port_initialized(port)) {
retval = (port->flags & ASYNC_HUP_NOTIFY) ?
-EAGAIN : -ERESTARTSYS;
break;
@@ -876,8 +876,9 @@ static void ircomm_tty_shutdown(struct ircomm_tty_cb *self)
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
- if (!test_and_clear_bit(ASYNCB_INITIALIZED, &self->port.flags))
+ if (!tty_port_initialized(&self->port))
return;
+ tty_port_set_initialized(&self->port, 0);
ircomm_tty_detach_cable(self);
@@ -1259,7 +1260,7 @@ static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m)
seq_printf(m, "%cASYNC_CHECK_CD", sep);
sep = '|';
}
- if (self->port.flags & ASYNC_INITIALIZED) {
+ if (tty_port_initialized(&self->port)) {
seq_printf(m, "%cASYNC_INITIALIZED", sep);
sep = '|';
}
diff --git a/net/irda/ircomm/ircomm_tty_ioctl.c b/net/irda/ircomm/ircomm_tty_ioctl.c
index e24724db36a2..d4fdf8f7b471 100644
--- a/net/irda/ircomm/ircomm_tty_ioctl.c
+++ b/net/irda/ircomm/ircomm_tty_ioctl.c
@@ -324,7 +324,7 @@ static int ircomm_tty_set_serial_info(struct ircomm_tty_cb *self,
check_and_exit:
- if (self->flags & ASYNC_INITIALIZED) {
+ if (tty_port_initialized(self)) {
if (((old_state.flags & ASYNC_SPD_MASK) !=
(self->flags & ASYNC_SPD_MASK)) ||
(old_driver.custom_divisor != driver->custom_divisor)) {