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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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5
drivers/ipack/devices/ipoctal.c
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@@ -629,8 +629,7 @@ static void ipoctal_hangup(struct tty_struct *tty)
tty_port_hangup(&channel->tty_port);
ipoctal_reset_channel(channel);
clear_bit(ASYNCB_INITIALIZED, &channel->tty_port.flags);
tty_port_set_initialized(&channel->tty_port, 0);
wake_up_interruptible(&channel->tty_port.open_wait);
}
@@ -642,7 +641,7 @@ static void ipoctal_shutdown(struct tty_struct *tty)
return;
ipoctal_reset_channel(channel);
clear_bit(ASYNCB_INITIALIZED, &channel->tty_port.flags);
tty_port_set_initialized(&channel->tty_port, 0);
}
static void ipoctal_cleanup(struct tty_struct *tty)