[SERIAL] turn serial semaphores into mutexes

Turn several drivers/serial/ semaphores-used-as-mutex into mutexes

Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 8 insertions, 7 deletions

diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index 9589509fc5bd..2ca620900bcc 100644
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -33,6 +33,7 @@
 #include <linux/device.h>
 #include <linux/serial.h> /* for serial_state and serial_icounter_struct */
 #include <linux/delay.h>
+#include <linux/mutex.h>
 
 #include <asm/irq.h>
 #include <asm/uaccess.h>
@@ -47,7 +48,7 @@
 /*
  * This is used to lock changes in serial line configuration.
  */
-static DECLARE_MUTEX(port_sem);
+static DEFINE_MUTEX(port_mutex);
 
 #define HIGH_BITS_OFFSET        ((sizeof(long)-sizeof(int))*8)
 
@@ -1472,7 +1473,7 @@ static struct uart_state *uart_get(struct uart_driver *drv, int line)
 {
         struct uart_state *state;
 
-        down(&port_sem);
+        mutex_lock(&port_mutex);
         state = drv->state + line;
         if (down_interruptible(&state->sem)) {
                 state = ERR_PTR(-ERESTARTSYS);
@@ -1509,7 +1510,7 @@ static struct uart_state *uart_get(struct uart_driver *drv, int line)
         }
 
  out:
-        up(&port_sem);
+        mutex_unlock(&port_mutex);
         return state;
 }
 
@@ -2219,7 +2220,7 @@ int uart_add_one_port(struct uart_driver *drv, struct uart_port *port)
 
         state = drv->state + port->line;
 
-        down(&port_sem);
+        mutex_lock(&port_mutex);
         if (state->port) {
                 ret = -EINVAL;
                 goto out;
@@ -2255,7 +2256,7 @@ int uart_add_one_port(struct uart_driver *drv, struct uart_port *port)
                 register_console(port->cons);
 
  out:
-        up(&port_sem);
+        mutex_unlock(&port_mutex);
 
         return ret;
 }
@@ -2279,7 +2280,7 @@ int uart_remove_one_port(struct uart_driver *drv, struct uart_port *port)
                 printk(KERN_ALERT "Removing wrong port: %p != %p\n",
                         state->port, port);
 
-        down(&port_sem);
+        mutex_lock(&port_mutex);
 
         /*
          * Remove the devices from devfs
@@ -2288,7 +2289,7 @@ int uart_remove_one_port(struct uart_driver *drv, struct uart_port *port)
 
         uart_unconfigure_port(drv, state);
         state->port = NULL;
-        up(&port_sem);
+        mutex_unlock(&port_mutex);
 
         return 0;
 }