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serial: trim locking on the helpers 

The port mutex protects port->tty, but these paths never need to walk from
port->tty. They do need the low level lock as the API expects that but they
already also take it.

Thus we can drop the extra mutex lock calls here.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Cox 2010-06-01 22:52:59 +02:00 committed by Greg Kroah-Hartman
parent de0c8cb314
commit 24fcc7c8cd
1 changed files with 1 additions and 4 deletions
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5
drivers/serial/serial_core.c
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@ -1506,12 +1506,10 @@ static int uart_carrier_raised(struct tty_port *port)
struct uart_state *state = container_of(port, struct uart_state, port);
struct uart_port *uport = state->uart_port;
int mctrl;
mutex_lock(&port->mutex);
spin_lock_irq(&uport->lock);
uport->ops->enable_ms(uport);
mctrl = uport->ops->get_mctrl(uport);
spin_unlock_irq(&uport->lock);
mutex_unlock(&port->mutex);
if (mctrl & TIOCM_CAR)
return 1;
return 0;
@ -1521,12 +1519,11 @@ static void uart_dtr_rts(struct tty_port *port, int onoff)
{
struct uart_state *state = container_of(port, struct uart_state, port);
struct uart_port *uport = state->uart_port;
mutex_lock(&port->mutex);
if (onoff)
uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS);
else
uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS);
mutex_unlock(&port->mutex);
}
/*