linux-kernel - [PATCH 19/31] serial: trim locking on the helpers

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Date:	Tue,  1 Jun 2010 22:52:59 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Greg KH <gregkh@...e.de>
Cc:	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Frederic Weisbecker <fweisbec@...il.com>,
	John Kacur <jkacur@...hat.com>, Alan Cox <alan@...ux.intel.com>
Subject: [PATCH 19/31] serial: trim locking on the helpers

From: Alan Cox <alan@...ux.intel.com>

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@...ux.intel.com>
---
 drivers/serial/serial_core.c |    5 +----
 1 files changed, 1 insertions(+), 4 deletions(-)

diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index 2379045..0603e0d 100644
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -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);
 }
 
 /*
-- 
1.7.0.4

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