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| 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/tty/tty_port.c | |
| parent | 80f02d5424301bf4df195d09b1a664f394435851 (diff) | |
| download | blackbird-obmc-linux-d41861ca19c9e96f12a4f1ebbc8255d00909a232.tar.gz blackbird-obmc-linux-d41861ca19c9e96f12a4f1ebbc8255d00909a232.zip | |
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/tty_port.c')
| -rw-r--r-- | drivers/tty/tty_port.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c index 130c8cf520cb..c3f9d93ba227 100644 --- a/drivers/tty/tty_port.c +++ b/drivers/tty/tty_port.c @@ -204,7 +204,8 @@ static void tty_port_shutdown(struct tty_port *port, struct tty_struct *tty) if (port->console) goto out; - if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) { + if (tty_port_initialized(port)) { + tty_port_set_initialized(port, 0); /* * Drop DTR/RTS if HUPCL is set. This causes any attached * modem to hang up the line. @@ -393,13 +394,13 @@ int tty_port_block_til_ready(struct tty_port *port, while (1) { /* Indicate we are open */ - if (C_BAUD(tty) && test_bit(ASYNCB_INITIALIZED, &port->flags)) + if (C_BAUD(tty) && tty_port_initialized(port)) tty_port_raise_dtr_rts(port); prepare_to_wait(&port->open_wait, &wait, TASK_INTERRUPTIBLE); /* Check for a hangup or uninitialised port. Return accordingly */ - if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) { + if (tty_hung_up_p(filp) || !tty_port_initialized(port)) { if (port->flags & ASYNC_HUP_NOTIFY) retval = -EAGAIN; else @@ -480,7 +481,7 @@ int tty_port_close_start(struct tty_port *port, tty->closing = 1; - if (test_bit(ASYNCB_INITIALIZED, &port->flags)) { + if (tty_port_initialized(port)) { /* Don't block on a stalled port, just pull the chain */ if (tty->flow_stopped) tty_driver_flush_buffer(tty); @@ -578,7 +579,7 @@ int tty_port_open(struct tty_port *port, struct tty_struct *tty, mutex_lock(&port->mutex); - if (!test_bit(ASYNCB_INITIALIZED, &port->flags)) { + if (!tty_port_initialized(port)) { clear_bit(TTY_IO_ERROR, &tty->flags); if (port->ops->activate) { int retval = port->ops->activate(port, tty); @@ -587,7 +588,7 @@ int tty_port_open(struct tty_port *port, struct tty_struct *tty, return retval; } } - set_bit(ASYNCB_INITIALIZED, &port->flags); + tty_port_set_initialized(port, 1); } mutex_unlock(&port->mutex); return tty_port_block_til_ready(port, tty, filp); |
