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authorPeter Hurley <peter@hurleysoftware.com>2016-04-09 17:53:22 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-04-30 09:26:55 -0700
commit807c8d81f4ec441241cafa3034c58df721fee869 (patch)
tree83402ad7f36b135d15d1aa6686ff26aa186b3dec /net/irda/ircomm/ircomm_tty.c
parent5604a98e2f95d6221852960a3363588f40d78e22 (diff)
tty: Replace ASYNC_NORMAL_ACTIVE bit and update atomically
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>
Diffstat (limited to 'net/irda/ircomm/ircomm_tty.c')
-rw-r--r--net/irda/ircomm/ircomm_tty.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/net/irda/ircomm/ircomm_tty.c b/net/irda/ircomm/ircomm_tty.c
index 840b82f760ba..681fe0bfe558 100644
--- a/net/irda/ircomm/ircomm_tty.c
+++ b/net/irda/ircomm/ircomm_tty.c
@@ -281,7 +281,7 @@ static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self,
* then make the check up front and then exit.
*/
if (tty_io_error(tty)) {
- port->flags |= ASYNC_NORMAL_ACTIVE;
+ tty_port_set_active(port, 1);
return 0;
}
@@ -289,7 +289,7 @@ static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self,
/* nonblock mode is set */
if (C_BAUD(tty))
tty_port_raise_dtr_rts(port);
- port->flags |= ASYNC_NORMAL_ACTIVE;
+ tty_port_set_active(port, 1);
pr_debug("%s(), O_NONBLOCK requested!\n", __func__);
return 0;
}
@@ -365,7 +365,7 @@ static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self,
__FILE__, __LINE__, tty->driver->name, port->count);
if (!retval)
- port->flags |= ASYNC_NORMAL_ACTIVE;
+ tty_port_set_active(port, 1);
return retval;
}
@@ -925,7 +925,6 @@ static void ircomm_tty_hangup(struct tty_struct *tty)
ircomm_tty_shutdown(self);
spin_lock_irqsave(&port->lock, flags);
- port->flags &= ~ASYNC_NORMAL_ACTIVE;
if (port->tty) {
set_bit(TTY_IO_ERROR, &port->tty->flags);
tty_kref_put(port->tty);
@@ -933,6 +932,7 @@ static void ircomm_tty_hangup(struct tty_struct *tty)
port->tty = NULL;
port->count = 0;
spin_unlock_irqrestore(&port->lock, flags);
+ tty_port_set_active(port, 0);
wake_up_interruptible(&port->open_wait);
}
@@ -1267,7 +1267,7 @@ static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m)
seq_printf(m, "%cASYNC_LOW_LATENCY", sep);
sep = '|';
}
- if (self->port.flags & ASYNC_NORMAL_ACTIVE) {
+ if (tty_port_active(&self->port)) {
seq_printf(m, "%cASYNC_NORMAL_ACTIVE", sep);
sep = '|';
}