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serial: core: Make enable_ms() optional 

This patch makes enable_ms() optional, so we can eliminate a lot of
empty enable_ms() implementations from driver code.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Shiyan 2014-06-03 18:54:43 +04:00 committed by Greg Kroah-Hartman
parent 953b53a71b
commit 1fdc31065f
1 changed files with 11 additions and 6 deletions
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17
drivers/tty/serial/serial_core.c
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@ -1050,6 +1050,15 @@ static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state)
return ret;
}
static void uart_enable_ms(struct uart_port *uport)
{
/*
* Force modem status interrupts on
*/
if (uport->ops->enable_ms)
uport->ops->enable_ms(uport);
}
/*
* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
* - mask passed in arg for lines of interest
@ -1073,11 +1082,7 @@ uart_wait_modem_status(struct uart_state *state, unsigned long arg)
*/
spin_lock_irq(&uport->lock);
memcpy(&cprev, &uport->icount, sizeof(struct uart_icount));
/*
* Force modem status interrupts on
*/
uport->ops->enable_ms(uport);
uart_enable_ms(uport);
spin_unlock_irq(&uport->lock);
add_wait_queue(&port->delta_msr_wait, &wait);
@ -1508,7 +1513,7 @@ static int uart_carrier_raised(struct tty_port *port)
struct uart_port *uport = state->uart_port;
int mctrl;
spin_lock_irq(&uport->lock);
uport->ops->enable_ms(uport);
uart_enable_ms(uport);
mctrl = uport->ops->get_mctrl(uport);
spin_unlock_irq(&uport->lock);
if (mctrl & TIOCM_CAR)